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The Lustrous/Gems

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     In General 

  • Amazing Technicolor Population: Their skin is actually the color of their alloy. Most days they wear a white powder over their skin to protect themselves from corrosion, making them look like they have pale skin at the default.
  • Ambiguous Gender: Since they are just gem beings with No Biological Sex, they have no confirmed gender. The English version keeps their dialogue genderless, using "they" and "them" as personal pronouns. In the original Japanese, however:
    • Most gems seem to tend towards using the masculine first-person pronouns of 'ore' and 'boku' to refer to themselves. The ones who don't, only three gems thus far, use the gender neutral " Watashi ", due to their more formal way of speaking.
      • Oddly enough, Alexandrite is the only gem to use the first person pronoun ’atashi’, which is strictly feminine. It could be justified since Alexandrite made it known that they want to be seen as “cute” by the other gems. It’s clear that various gendered first person pronouns exist in their world, despite a majority of the gems having a preference for masculine ones and not truly having a concept of gender.
    • When they refer to the older gems, like Yellow Diamond, as their siblings, they use 'Onii-sama', 'Nii-sama' and 'Aniki'. Diamond also referred to Bort as 'Otouto'/'Little Brother' when reprimanding Phos.
    • Diamond, when referring to the younger gems as a collective, referred to them as " Otoutotachi " meaning " Younger Brothers ".
    • When referring to other gems, they use 'Kare' which translates to 'he/him'.
    • Regardless of what first-person pronoun they use, some gems' speech patterns are decidedly more masculine or feminine than others, likely because of their personalities. For example, Jade uses more masculine speech, while Dia tends towards feminine language. Rutile, a doctor, sticks to formal, gender-neutral language.
    • Given a lampshade in Chapter 72, where one of the Lunarians addresses Phos as a "crystal lady...or not, I don't know". Additionally, Cairngorm is given the title of "Moon Princess" after they marry Aechmea.
  • Barbie Doll Anatomy: Zigzagged; on the one hand the gems are sexless and, as shown with Euclase when they strip down in chapter 8 in order to get covered in the anti-salt resin, they don't appear to have visible genitalia. But they still have asses and Euclase gets embarrassed when another gem sees them naked. It's a wonder if they actually have anything to hide (that we haven't seen) or if the gem is, for some reason, just modest.
  • Bizarre Alien Biology: Ambulatory gem formations that arose from fossilized human bones living in a symbiosis with microscopic life known as "inclusions". Every inclusion can hold memories, so their entire bodies are essentially their brains, with any damage affecting memory. The inclusions themselves seem to be photosynthetic like plants, but only require sunlight and can survive in both freezing temperatures and a vacuum. Without enough light, they quickly go dormant, meaning most gems will sleep at night and during winter.
  • Curtains Match the Window: Since they're gem people, their bodies are all made of the same material, so usually the color of their eyes matches the color of their hair. Post-moon migration, Cairngorm is the only exception, given their eyes were replaced with eyes of their gem type while the hair is still scraps of Ghost's hair.
  • Dark and Troubled Past: After a meteor struck the Earth, life was forced to flee back into the seas, though the ones that couldn't get there in time died, with some sinking into the sea. Their bodies decomposed and were turned into "inanimate objects", but over the ages, some of these remains were crystallized and became sentient, thus birthing the Lustrous, who would return to land.
  • Deep Sleep: They all hibernate during winter, since the sunlight becomes so faint. The exceptions are Sensei, who is always sleepy regardless of the weather, and whoever is the Winter Guardian. The Winter Guardiam endures the effort of staying awake in low sunlight in order to keep Sensei company in protecting the other sleeping gems.
  • Evil Costume Switch: Eventually, all of the Gems who went with Phos to the Moon switched their old uniforms for thematically similar, but unique white clothing from the Lunarians. Dips into Non-Uniform Uniform as well.
  • First-Name Basis: All of the Gems are like this since they have Only One Name, but after Sensei steps down from his role as leader the Gems begin to call him by his first name as well.
  • Flat Character: Quite a few of the gems are one-dimensional due to the amount of characters in the cast and because most of the events of the story happen directly because of Phos without their involvement.
  • Immortality: The gems are completely immortal. They can live on naturally for seemingly forever, and, if broken, they can wake up as long as they have suitable material. Being taken to the Moon is the closest to death they can reach.
  • Immortal Immaturity: Despite looking like teens physically, centuries old existentially, and educated by Sensei (their guardian), some of the Lustrous still are, on a psychological level, children that can act a lot younger than even their physical forms appear to be.
  • Killed Off for Real: Any gem who gets taken to the moon is treated as this. Later confirmed to undoubtedly be the case, as the Lunarians grind any captured gems into powder and scatter them across the moon's surface. The powder also gets eaten by the captured Admirabilis, lessening chances of revival. However, as per Phos's deal, the Lunarians have agreed to try to synthesize what remains of the gem powder back into full gems, making this fate come into question again for gems that are harder than 4.
  • Laser-Guided Amnesia: Their bodies are quite literally their entire being, including memories. If any part of it is lost, then part of their memories go along with it.
  • Motive Decay/The Dark Side Will Make You Forget: The Gems that went with Phos to the Moon largely forget about the motives that led them to their decision in the first place, preferring to play around with each other and the Lunarians.
  • Mourning Clothes: According to an interview, the uniforms the Gems are wearing are actually funeral attire. And given that Kongou is built to be a monk that passes the dead on, it brings their whole culture to a new meaning.
  • Noodle People: The mangaka draws the gems as really thin humanoids with long legs.
  • No Biological Sex: They have no genitals or other physical sex characteristics.
  • Non-Uniform Uniform: In contrast to their usual uniforms, the gems' sleepwear is all unique (though all a similar shade of white) and while the moon gems all wear white, the similarities in their outfits end there.
  • They've Got Legs: And their outfits, one and all, seem to be designed to highlight it.
  • The Power of the Sun: They feed and function on sunlight.
  • Undying Loyalty: They all have an inkling that Sensei knows way more than he lets on, and have a suspicion about his connection to the Moon People, but all but one love and serve him anyway.
  • Who Wants to Live Forever?: Slowly applying to the gems. Those on the Moon want to leave their gem bodies and become Lunarians while those on Earth are shown to forget critical information after long periods of time in uneventful stasis, allowing them to happily live on without being bothered by their immortality in the larger picture.


Click here to see Phos after the 102 year time skip. 
Click here to see Phos after coming back from the moon. 

Voiced by: Tomoyo Kurosawa (Japanese), Sarah Wiedenheft (English), Tamara Veppo (Latin American Spanish)

The protagonist. Starts the story as a vain and weak gem that brings trouble for everyone, until the moment the gem gets the job of writing a Natural Encyclopedia. Phos' inclusions have the ability of maintaining themselves and Phos' consciousness no matter how many fragments the gem loses.

  • 0% Approval Rating: By the time they go back to the surface for a third time, the Earth gems are all distrustful of Phos and treat them much worse, all contributing to slashing Phos into little pieces when Phos lifts a hand towards Sensei out of desperation.
  • 100% Adoration Rating: Despite how bleak their life become, they're still universally worshiped as a god by the Admirabilis, both on land and the moon, to the point the latter are willing to commit suicide for them if ever ordered to. Only due to being digested alive by Ventricosus and getting gifted legs from Aculeatus at an early point in life though, carrying the scent of that royalty ever since.
  • Affectionate Nickname: Phos.
  • Amnesiac Hero: Of sorts. The Lustrous store their memories within their gem bodies. Phos loses part of their memories when their legs, a full third of Phos' mass, are chopped off. They continue to lose more and more of their memories every time they lose body parts, which turns out to be fairly often. Rutile and the other gems start to really worry about Phos' integrity after Phos' head gets taken, after which less than 50% of their original gem mass remains.
  • The Assimilator: Their inclusions have a tendency to spread and corrupt anything they come in contact with, best shown in how they have yet to reject a single mineral they have come in contact with. May it be agate, gold, platinum, lapis lazuli or pearls, as seen so far.
  • The Baby of the Bunch: At the start of the series Phos is the youngest of all the Lustrous at 299 years old and has the maturity to match. This is eventually subverted though after the 102 year Time Skip as new Gems are creating and introduced in the series.
  • Be Careful What You Wish For: At the start of the series Phos was desperate to be a warrior and prove themselves to the other Gems and to Sensei. They eventually got their wish by the end of the Winter arc at the cost of their mentor Antarcticite and their innocence. Phos even lampshades this noting that all they wanted was to be a warrior and all they got for it was a dangerous job.
  • Become a Real Boy: Implied as of Chapter 77: Phos is able to get past Sensei's authentication system and he tries to obey Phos's plea, highly suggesting Sensei now sees Phos as a human rather than a gem.
  • BFS: Uses Antarc's ice hatchet for a while during and after the Winter Arc, before switching to a regular sword. Gets a huge, shiny new sword from the Lunarians during Phos' trip to the moon.
  • Break the Cutie: Phos' first true moment of despair is after they lose their mentor Antarcticite. The rest of the series is one long Trauma Conga Line with Phos becoming increasingly cynical over time.
  • Butt-Monkey: At the beginning of the story, this is Phos's only recognition. Even after becoming stronger, the gem still tends to get the short end of the stick. That is, until the Winter arc.
  • The Champion: Becomes one in the eyes of the Admirabilis. And after coming back from the Moon, the other Lustrous see Phos as their "hope" least until the Gem starts taking other Gems with them to the Moon. Then they're seen as a traitor.
  • Character Development: From an arrogant, useless child to a mature warrior who starts showing signs of PTSD and distrust about the surrounding world.
  • Clothing Damage: Spends nearly their entire visit to the moon half-naked. Cicada lampshades it.
  • Combat Stilettos: Gains a pair after Antarcticite's capture, with the heel made of the gold and platinum from Phos' arms.
  • Conspiracy Theorist: Starts suspecting a relationship between Kongou-Sensei and the Lunarians. They're proven correct during their visit to the moon.
  • Constantly Curious: They're incapable of just leaving things be... no matter how much it costs them or others. Seeing environments other than the gems' island only made them want to see more.
  • Corrupt the Cutie: Phos becomes a lot darker, manipulative, and morally ambiguous after receiving Lapis Lazuli's head as a substitute for their own.
  • The Dark Side Will Make You Forget: After getting Lapis's head grafted onto their body, they forget their promise to Cinnabar, and after going to the Moon it is no longer their priority.
  • Dead Partner: Antarcticite. Then Ghost Quartz. Later, Phos themself becomes this in the eyes of Cairngorm... for a while, at least, then Padparadscha seems to have died protecting Phos from Cinnabar.
  • Death Seeker:
  • Determinator: Both with their original goal of helping Cinnabar find a happier job, and with their new goal of unveiling the mystery of the Lunarians. Now with their promise to make Sensei free the Lunarians' souls in exchange for bringing the dead Gems back to life.
  • Did Not Think This Through: They have a problem of acting first before thinking, which gets them into serious trouble in many arcs.
  • Discard and Draw: After Phos loses their original legs and gets agate replacements they suddenly gain Super Speed that can rival Yellow Diamond. After getting their gold and platinum alloy arms the weight of them ends up costing Phos their mobility but they can now change the composition of their arms to make a powerful offense and defence.
  • Doom Magnet: Most people that Phos encounters over the course of the story finish the arc in a worse state than when they started (Antarc and Ghost are taken to the moon, for example).
  • Expository Hairstyle Change: Phos' hair becomes shorter after the timeskip of the Winter Arc, as they used some of their hair to repair the cracks made by the new metal alloys in their body. Gets long hair after gaining Lapis' head, but it goes back to being the length it was after the Winter Arc after getting cut short by an arrow.
  • Eye Scream: Gets their eye graphically torn out and replaced with a pearl eye made by the Lunarians.
  • Face–Heel Turn: In a sense. Phos is currently working for the Lunarians.
  • Failure Hero: Everything Phos does ends up in a disaster for either themselves or for other people. They couldn't find a job they were good at for the first 299 years of their life, and only found themselves getting in the way. Bringing Ventricosus back to the ocean ends with Phos losing their legs; staying up for the winter and helping Antarcticite ends with Phos losing their arms and Antarc getting taken to the moon. Pairing up with Ghost ends with Cairngorm emerging, but only after Ghost is chipped away and taken to the moon. Even their night raid ended prematurely; the gem's team never gets to negotiate with Sensei, only fighting the Earth Gems and getting Padparadscha severely damaged. When Phos goes to the Gems alone and begs Sensei to pray for the Lunarians, the Gems shatter Phos and separate the pieces. Ultimately, Phos does get one long term goal right, unknowingly; the Lunarians stop attacking the Gems for 220 years and the Gems live in relative peace, but Phos has not been able to revive the other dusted Gems and everyone has forgotten Phos even exists.
  • Famed In-Story: The Admirabilis end up revering Phos as a sort of god later in the story.
  • Faking Amnesia: After going to the Moon, Phos pretends to have forgotten everything that happened to them there. Given the amount of times they genuinely did lose their memory, it works for a while.
  • The Friend Nobody Likes: For a good chunk of the early story, Phos was just a Gem that everybody tolerated at best and were annoyed with at worst. Phos' overall uselessness didn't help smooth things over with their peers either. Even when the Gem becomes stronger and more involved with the problems of the story, many people don't see Phos as anything other than an acquaintance. Things get worse from there.
  • The Gadfly: Enjoys tormenting their partner Cairngorm with sarcastic groveling and play acting.
  • Glowing Eyes: After returning from the moon Phos's pearl eye glows in the darkness, spooking some of the gems.
  • Hallucinations: After Antarcticite gets taken by the Moon People, Phos constantly sees a hallucination of the gem in their whole state and then breaking shortly after, and sometimes converses with it. The cause is a deteriorating mental state.
  • Has a Type: Phos' major partners (Antarc, Ghost, and Cairngorm) have all been white-haired. It might be the gem's subconscious reminding them of Antarc.
    • Additionally, many of the people Phos interacts with later in the story (Cinnabar, Antarticite, Cairngorm, Bort) like to call Phos out on their faults or are sarcastic/snarky. Phos seems to have a thing for strong-willed Gems.
  • Heroes Prefer Redheads: It's not made clear if the feelings are romantic in nature, but Phos seems to have a thing going on for Cinnabar after Cinnabar saved them. Padparadscha, a gem Phos later partners with for a mission, also has bright red hair.
  • Heroic BSoD: Phos has a very hard time adjusting to all the revelations that Prince gives them about their situation and what exactly the Moon People are. And once they figure out that their comrades have been ground into powder as decoration, they barely say anything for much of the Prince's explanation, and tries to attack him to no avail.
  • Heroic Self-Deprecation: Let's just say Phos' self-esteem is far from great after suffering continuous failures.
  • Heart Is an Awesome Power: Turns out Phos' inclusions do have an ability, where the gem's ego is retained no matter how small the fragment of Phos' original form is left. This makes Phos pretty much completely immortal as long as they have something to attach a part to.
  • Hyper-Awareness: The power Phos gains after getting a head replaced.
  • I Hate Past Me: When hearing about the things they used to do before getting all of their attachments, Phos seems very embarrassed about how reckless and foolish they once were. Especially since they can't remember a lot of it.
  • I Let Gwen Stacy Die: At their core, the one thing that has motivated Phos the entire journey is Antarcticite's kidnapping.
  • Important Haircut: Has their hair sliced off after having Lapis's head grafted on, both showing they are not Lapis and not their innocent self either.
  • Inferiority Superiority Complex: A downplayed example. Bravado was really all Phos had.
  • Innocently Insensitive:
    • In Phos' pursuit of knowledge and strength, they've become somewhat insensitive to some of the gems that care about them, like Cinnabar (especially Cinnabar) and Jade when they become traumatized.
    • In a more extreme example, Phos thought the Gems in their party would be more understanding if they show them and inform them of the moon dust made of all of their loved ones.
  • Irony: Their arms being replaced by gold and platinum alloys is a reference to the Japanese art of kinsetsuroi, in which broken pottery is repaired using gold, silver, or platinum lacquer. Kinsetsuroi is seen as a metaphor for beauty in struggle, but ironically, another value in Japan is innocence. Stories that involve a child being involved in something bad (such as killing) is seen as a tragedy for that child's loss of innocence. This serves to underscore that Phos's story is a beautiful tragedy.
  • "It" Is Dehumanizing: After coming to see the Lunarians' side of the conflict, Phos begins to see Sensei as a "thing" and a broken tool.
  • It's All My Fault: Feels personally responsible for the kidnappings of Antarcticite, Ghost, Morganite, and Goshe, but feels especially guilty for what happened to Antarc.
  • The Klutz: Tends to break things and make trouble for everyone, at least at the beginning.
  • Master of the Mixed Message: Oh, it gets bad with Cinnabar. Phos has the other Gem on tenterhooks every time they meet, with them telling Cinnabar how they constantly have them in the back of their mind or trying to manipulate their feelings by saying they "need" them.
  • Meaningful Name: Phosphophyllite is known as the "holy grail of minerals", befitting how Phos is the main character of the story.
  • Mental Fusion: May have fused with Lapis's mind after having their head replaced, indicated by how manipulative they have become.
  • Misery Builds Character: Replacement of lost body parts does this too, for Gems.
  • Mismatched Eyes: After getting the synthetic Pearl eye from the Lunarians, has one blue eye and one white eye.
  • Morph Weapon: Phos' arms get replaced with gold and platinum alloys, which can be stretch and manipulate in various ways to fight.
  • My Eyes Are Leaking: Phos cries alloy tears after the Winter events, without even knowing what tears are. Kongou-Sensei explains they are a minor inconvenience from an ancient species.
  • Off with His Head!: Phos' head gets lost in battle against the Lunarians. It gets replaced with Lapis Lazuli's head.
  • Power at a Price: The different upgrades Phos gets come with several costs, both to Phos' memory and mental state.
  • The Promise: Promises to find Cinnabar a job only they can do. Eventually, however, most of the memories of that promise vanish, though Phos never lets go of the idea. They also promise the new Morganite and Goshe that they'd try to let the pair meet the old Morganite and Goshe.
  • Properly Paranoid: Regarding Kongou-Sensei and Sensei's supposed connection with the Lunarians, Phos' starts becoming more and more anxious about the mysteries surrounding those facts.
  • Red Oni, Blue Oni: The red to Padparadscha's blue during the Moon arc. Phos wishes to smash Sensei to pieces after hearing Anarctitite cannot be repaired, while Padparadscha counsels calm and coordinated planning in order to save the other gems.
  • Replacement Goldfish: Offers to become one to Cairngorm for Lapis after Phos wakes up after getting their head replaced with Lapis'.
  • Sad Clown: By the later volumes, its clear Phos is pulling this to cover for their own self loathing.
  • Sadistic Choice: Must choose between killing the remaining Admirabilis to restore the kidnapped Gems or refusing to sacrifice the creatures at the expense of Phos' people, since the Admirabilis have eaten quite a bit of the gem pieces and incorporated them into their shells.
  • Sanity Slippage: As the gem loses more pieces of themself, they become more and more manipulative and take more and more risks. They may be suffering from PTSD, as they mistake Cairngorm for their former partner Antarc during battle.
  • Secret Keeper: Keeps in secret the method by which Kongou-Sensei fights.
  • Secretly Selfish: Accused of this by Bort during their confrontation in the night raid. Phos, to Bort, doesn't do what they do for the good of the Lustrous, but because they're really just using the group as an excuse to better themselves and become stronger.
  • Seldom-Seen Species: Houseki no Kuni is probably the first you've ever heard of phosphophyllite. In real life, phosphophyllite is highly prized for its rarity, and as a result, it is too valuable to be broken up or cut on purpose without screwing up on account of its fragility.
  • Sexy Backless Outfit: After going to the Moon and getting a change of clothes from the Lunarians, Phos gains a backless white bodysuit and seems much more forward.
  • Shrinking Violet: Padparadscha distinctly remembers, back when they saw Phos 237 years prior, that Phos always used to hide behind Sensei's robes. This is even shown in the first chapter that Phos hid amongst Sensei's robes during the first Lunarian battle.
  • Slowly Slipping Into Evil: After getting Lapis's head Phos is slowly going down the slope, first going to the moon and then making a Deal with the Devil with the Lunarians, then manipulating other gems to come the moon with them to make a deal as well.
  • Super Speed: For a good while, thanks to their Agate legs. However they don't come with the tertiary powers required like the inertia control and so Phos's super speed is useless in actual fighting. Loses this power after gaining their alloyed arms, as the weight of their arms slows them down.
  • Swallowed Whole: By Ventricosus the Sea Slug. Gets better, though.
  • Symbolic Blood: The gold-platinum works as this for Phos, pooling around them whenever they're cut in half, peeking out when they're cracked, or dripping and melting when Phos feels particularly self destructive. It also generally represents their emotional state at the time.
  • Tareme Eyes: Starts out with these in the beginning of the story and in their youth, but switches to Tsurime Eyes after the Winter arc. Phos' eyes become even more tsurime after they gain Lapis' head.
  • This Loser Is You: Compared to the other Lustrous, Phos grows and changes constantly (both physically and mentally) throughout the story, cries, and looks different as time passes, much like a human would. They're also a huge screw-up, they rush headlong into plans without considering the consequences, and they ultimately come off worse for the wear while becoming stronger.
  • Tranquil Fury: After hearing Antarc cannot be repaired, Phos sweetly comments on how they should smash Sensei into pieces so as to not make Antarc lonely, frightening the other gems until Padparadscha calms them down.
  • Trauma Conga Line: Losing two partners in the span of a year, alongside with the revelation that everything they had previously believed may be a lie, doesn't really do wonders to Phos' sanity.
  • Took a Level in Badass: Goes from being unable to even stand up and fight to being on par with Bort to coming to surpass Bort.
  • Undying Loyalty: Tends to inspire it in others, from Ghost to Cairngorm and finally Padparadscha.
  • Unique Protagonist Asset: Phos' ability to accept parts from such wildly different materials like agate, gold, and lapis lazuli, is unusual, if not unique, among the Gems. By the time Phos' head is being replaced, Rutile begins to wonder whether they can still be called "Phosphophyllite".
  • Unperson: They've come to be so revolted by the Earth Gems for their actions that they tear Phos into several pieces and scatter them around the Earth so that Phos can definitely never come back together. Sensei ultimately proves them wrong by putting Phos back together 220 years, but it partly only takes that long because he needed the Gems to forget who Phos was so that they wouldn't make him start all over. When Phos learns of this, they ask Sensei to pray for them.
  • Vetinari Job Security: Takes on Antarcticite's role as the winter watchman.
  • "Well Done, Son!" Guy: At the very least, their primary motivation in the beginning of the story was to have some use to the Lustrous circle. By the looks of their "tearing" up when Euclase tells them they're needed, the feeling never goes away even as Phos' parts get replaced one by one.
  • Well-Intentioned Extremist: They really do think that some morally questionable ideas, like betraying Kongou or taking Pad to the Moon, are for the good of the rest of the Lustrous.
  • The Whitest Black Guy: After coming back from the Moon, Phos is stuck between two worlds yet isn't really a part of either. The Lustrous don't see Phos as themselves or as a Lustrous ally, while the Lunarians still see Phos as a Gem.
  • Woman in White: Wears all white following the return from the Moon and gives off an air of mystery to the other gems.
  • You Remind Me of X: Ghost and Cairngorm's willingness to partner up is partially based on how much the Gems see Lapis Lazuli in Phos.


The Scariest Sensei.

Voiced by: Joji Nakata (Japanese), Brian Mathis (English), Matias Fajardo (Latin American Spanish)

Kongou-sensei (金剛先生 Kongou-sensei, lit. Adamant Teacher) is the Mentor and Leader of the Lustrous. Very old and very mysterious.

  • Affectionate Gesture to the Head: Seems fond of doing it to the other gems, for any number of reasons. Mostly comfort and praise though.
  • Affectionate Nickname: Tourmaline quickly comes to nickname Sensei after he steps down, calling him "Kon-chan".
  • AI Is A Crap Shoot: Was created to release human souls into the afterlife, but for some reason isn't completing the task. Prince believes he broke down over time, but is implied there is another reason Sensei has rejected the idea. When Phos flat out asks him to pray, he displays an error message and fails.
  • Artificial Intelligence: Revealed to be a machine created by humans.
  • Bald of Awesome: Not a hair on that scalp, and can kick anyone's ass with ease.
  • Bad Liar: Starts to get more prominent as the story goes on. When the Gems give him information that he's familiar with, he denies having a connection to it.
  • Beneath the Mask: He admits that being a leader and mentor for the gems was the hardest thing he ever had to do because he always had to be knitting his brow, and was also designed to be a servant that deferred to the last humans. Once they decide to start their relationship anew on equal terms, he seems to adopt a more vacant, relaxed expression.
  • Cast from Hit Points: Eventually Phos discovers this is Sensei's method of fighting: by breaking tiny shards from his hands and throwing them to the Lunarians. Since the shards are so small, Sensei doesn't lose that many memories but still seems somewhat troubled about doing it.
  • Classified Information:
    • For some reason of another, Sensei won't ever tell the other Gems why the Lunarians are after them, or what they could possibly want from him. Given that he's a robot from long before humanity finally went extinct, it's entirely possible that he's programmed not to say anything about it, no matter how much he may want to.
    • Further confirmed in Chapter 64, when his attempt at revealing the truth ends up being mostly fruitless due to most of his speech being involuntarily silenced as he tries to refer to the Humans, the Moon People intentions, or the previous cataclysm.
  • Dream Sequence: Has one during the Winter chapters, in which the Lunarians come to adore him. They actually have done that, so the dream was likely a sort of flashback.
  • Dub Name Change: Called Master Vajra in the French translation.
  • Eyes Always Shut: Tends to be like this most of the time.
  • Glamour: Implied. The Lunarians state that Sensei is built to seem trustworthy and impossible to harm to protect him from ill-wishers. They cannot help but feel love for him even as they resent being unable to pass on. Phos seems to be the only one immune to this ability. Yellow Diamond in particular is in panic at the thought of fighting against him.
  • Heavy Sleeper: Jade proclaims that it's easier to fight the Lunarians than wake up Sensei.
  • Hunk: Has a very attractive and muscular figure underneath his robes. Ventricosus comments on his good looks in her slug form.
  • It's All My Fault: Sensei blames himself for all of the suffering the Lustrous undergo. Whether it's Cinnabar's ongoing loneliness, any Lustrous being captured by the Lunarians, or Phos' betrayal.
  • Large and in Charge: Leads the Lustrous, and towers over each and every one of them.
  • The Leader: Of the Lustrous. The Lunarians also seem to adore him, though it's left ambiguous.
  • Lonely at the Top: Implied by one of Sensei's speeches, although Sensei dodges Jade's direct question about this being the case.
  • Lost Technology: The artificial hexagonal diamonds he's constructed from cannot be replicated by the Lunarians, who can synthesize any other kind of gemstone with their advanced technology.
  • Lotus Position: Usually sleeps or rests in this position, as Sensei likes to meditate.
  • Made of Iron: The hardest of all the Lustrous.
  • Make Me Wanna Shout: When Sensei screams at a Gem, their body shatters. This is usually done as a means of punishment when the gems disobey their orders.
  • The Mentor: For all the Lustrous, as it is in his name.
  • Mysterious Past: Clearly has a past with the Lunarians, and is overall considerably older than the other Gems. It turns out he was created to pray for them but is unable to complete the task anymore.
  • Nigh Invulnerable: Being made out of hexagonal diamonds, Sensei is unable to be broken by anything but himself.
  • O.O.C. Is Serious Business: Sensei was always one with a limited expressions set, but he did show concern and care to his Gems. When Phos mentions humans though, he accidentally shatters a table out of shock. That all goes away every time he interacts with Phos after coming back from the Moon, acting expressionless and unconcerned.
    • At the end of Chapter 79, he sports a terrified expression for the first time.
  • Out-of-Character Moment: Discussed. Sensei reveals he had a very hard time disciplining the Gems due to this running contrary to his programmed nature to serve.
  • Overly Long Name: His actual name is Kongou Daihijishou Jizou Bosatsu (in the scanlations, Vajra Mahametta Ratana Ksitigarbha).
  • Perpetual Frowner: Zizagged. Sensei acts like this, but commentary indicates it's a masquerade because Sensei seems to have a case of bad poker face.
  • Psychopomp: Should be the one to guide human souls to the afterlife, but is not completing the task for some reason.
  • Really 700 Years Old: At least 3,600 years old by the start of the story. Revealed by Prince to be at LEAST 10,000 years old.
  • Technophobe: Aechmea suggests Sensei is one, not allowing the gems to experiment with new technology so they didn't figure out he was a robot.
  • Three Laws-Compliant: Implied. He only takes direct orders from humans, and when the "Professor" Lunarian is sent down, Sensei can't do anything against it and yells at the Gems for someone, anyone to take it down but him. The series all but outright states that he recognizes Phos as something of a human after the gem returns from the Moon, given that he both answers to Phos when asked and immediately activates his prayer protocol after Phos begs him.
  • Tongue-Tied: When Phos is able to get information about Kongou from a third party, it's theorized that Kongou isn't being deceptive about what he knows regarding the Lunarians, he sincerely can not speak of it because doing so would require permission from a human, which no longer exist. This seems to be proven correct when Kongou comes clean to the other Gems, as he opens with saying that there are things he can't reveal and his sentences inexplicably cut off when he tries, until he gets to events specific to the Gems themselves.


The Lonely Child.

Voiced by: Mikako Komatsu (Japanese), Avery Smithhart (English), Carolina Cortes (Latin American Spanish)

A gem that constantly produces a poison (mercury) that damages and ruins its surroundings. Because of this they are set apart from other gems, a fact that saddens them greatly. They are in charge of the futile task of patrolling during the night.

  • Adaptation Expansion: Cinnabar is given a lot more scenes in the anime then their manga counterpart likely to emphasise their importance to Phos' character arc. More specifically, Cinnabar is the one who destroys the Lunarian that Phos interrogates as opposed to the Amethysts.
  • Affectionate Nickname: Shinsha, which is actually an alternative spelling of their name.
  • Awesome, but Impractical: The poison Cinnabar uses is powerful, can be formed into any size and shape, and provides excellent cover during a fight. But it harms everyone and everything except themselves, leaving entire grounds scarred until the poison eventually goes away. About the only practical use it has is collecting light at times when it is scarce (night, winter season).
  • The Aloner: Forced to be alone due to their powers, and clearly resents that fact. Not so alone anymore following the Moon exodus, given that Bort forcibly brings Cinnabar into the group to tell them what they know.
  • Broken Ace: Really talented at pretty much anything, though their state makes it so it's all useless for them.
  • Broken Bird: Constantly sad and depressed, and with a good reason.
  • Commuting on a Bus: As important as Cinnabar is to Phos, and as important as the anime's OP made the pair's relationship look, Cinnabar doesn't get much time in the manga to shine, only showing up once every major arc or so when Phos remembers they exist. At least a part of it has to do with Phos gradually forgetting certain bits of the promise they made with Cinnabar in the beginning. This is seen in the Anime as well, where Cinnabar hardly shows up later on in the series unless Phos needs to have a non-crucial interaction with them.
  • Corner of Woe: Most of the times their night patrolling just consists of doing that. They know no one is coming.
  • Death Seeker: They're actually hoping for the Lunarians to take them with them, since they feel so useless otherwise. When Phos finally offers to take him to the Moon, though, Cinnabar doesn't take the opportunity, stating that Sensei would be lonely if they left.
  • Desperately Seeking A Purpose In Life: Or rather, desperately seeking that Phos finds them a purpose in life. In a dark twist, they get this as a result of Phos's betrayal, becoming a key fighter against the Moon Gems and partnering with Bort.
  • Expressive Accessory: The mercury surrounding Shinsha constantly responds to whatever he's feeling. In particular, whenever Shinsha is surprised, like when their feelings for Phos are more prominent, the mercury starts to starburst.
  • Foil: To Phos. Phos is a weak Gem that can't do any task because of incompetence, while Cinnabar physically can't do anything because of their dangerous body. Phos is immature and arrogant, while Cinnabar is somewhat world-wise and puts on a mean front to hide their real feelings. They both have a red/green contrast later a red/blue contrast after Phos gets Lapis' head, and both are the only ones that can cry alloy.
  • Green-Eyed Monster: Loudly proclaims to be jealous of Phos, who is useless but at least wanted by others.
  • I Just Want to Be Loved: Their main problem. They want to feel like they're of use and wanted to somebody, even if it meant being taken by Lunarians. Phos actually approaching them and promising to give him a job gave Cinnabar some measure of hope, and giving Phos advice whenever they came around gave them something to do. It's also a big reason why Cin wants to partner with Phos so badly.
  • I Just Want to Have Friends: Their other main problem.
  • Ironic Echo: "Don't go to the Moon", said to Phos as a reversal of what Phos said to Cinnabar in the second chapter.
  • Lonely at the Top: According to Sensei, as Cinnabar's really talented but due to their problem is forced to be alone.
  • Luminescent Blush: When Phos arrives and asks Cinnabar to help them with their investigation against Sensei they tell Cinnabar that they have a job for them. Cinnabar then asks them what happened to the "fun" part and reminds Phos of The Promise they made about finding Cinnabar a "fun job that only [they] can do" with a big blush on their face. This naturally makes Phos more then a little embarrassed as well.
  • Odd Name Out: Cinnabar is the only gem that gets referred to by their Japanese name (辰砂 shinsha), although in the manga it's written in katakana as シンシャ.
  • Playing Hard to Get: Cinnabar really just wants to become Phos' partner, but every time the latter Gem asks to, they drive them away. It also depends on what Phos really wants to do and the intentions behind their words (i.e. "I want you to work together with me we can betray Kongou together"). No matter what, Phos doesn't have an easy time getting Cinnabar to directly cooperate.
  • Poisonous Person: Their body constantly releases a sort of poison that damages its surroundings and other Gems around them. Although the poison is not identified in-series, it is most likely mercury, as real cinnabar is the main ore of mercury.
    • Which is also the reason why, unlike the rest of the gems, Cinnabar did not get a necklace in the Houseki no Kuni collaboration with TASAKI.
  • The Promise: Phos promised they'll find a job Cinnabar can do, and one that Cin will enjoy. Sadly for them, as Phos lost many parts of their body, they also seemingly forgot about this promise.
  • Reassigned to Antarctica: Because Cinnabar is too dangerous to have around, Sensei reassigned the Gem to night duty, where Cin can roam around freely and observe if Lunarians will come, but at the cost of having the least interactions with the rest of the Gems and ultimately fulfilling a useless role, given that the Lunarians never attack at night.
  • Refusal of the Call: Unexpectedly, Cinnabar outright refuses to go to the Moon when prompted by Phos.
  • Satellite Character: Most of their development and relevancy needs Phos to be present for it, and is otherwise not the focus of any chapter.
  • Ship Tease: Mainly with Phos.
  • Static Character: While many Gems at least have different developments going on in the story, Cinnbar and their situation largely stays the same for the duration of the story. It's supposed to contrast how much Phos has changed from their original self and intentions. However, they finally begin to get character development as of the Moon Arc.
  • Tsundere: For Phos. One breath and they'll loudly complain or criticize Phos for being clumsy, useless, thoughtless, or insensitive— and then in the next they'll be jealous of Phos and wish that they'd give them a new purpose.
  • Voluntary Shapeshifter: To an extent, they can manipulate the poison from their body to create figures or copies of themselves.
  • Walking Wasteland: Thanks to the poison which emanates from their body. Areas that Cinnabar uses it in can't be accessed for a while because of the dangers of it, and gems that come into to contact with the mercury have to get the parts that touched it taken off.
  • Woobie, Destroyer of Worlds: Besides that sadness, it is actually true it could hurt or kill the Gems to even be around them.


Click here to see Diamond after the 220 year time skip 

Voiced by: Ai Kayano (Japanese), Savanna Menzel (English)

A model and idol for the Lustrous, and Bort's partner. Later partners up with Yellow Diamond.

  • Affectionate Nickname: Dia.
  • Always Second Best: In fighting, when compared to Bort. Despite both of them having hardnesses of 10, Dia will shatter easily if hit in the right place. It's sort of a touchy subject. Their insecurities about this lead them to choose to go to the Moon with Phos.
  • Attack! Attack! Attack!: Dia's fighting style, which is very reckless.
  • Big Brother Worship: Really seems to adore Yellow Diamond.
  • Bishie Sparkle: Constantly sparkles, and they're also considered the prettiest of all Gems. Even at night they shine brightly.
  • Cloudcuckoolander: Called "airy" by Benito when they lament that Dia and Yellow have been partnered together.
  • Cuteness Proximity: To the Shiro plushie that Red Beryl stitched for her.
  • The Cutie: Dia is a sweetie and loves cute things. The gem introductions at the beginning of each volume point this out constantly.
  • Foil: To Cinnabar. Despite being born in the same year, Dia is loved and popular, whereas Cinnabar is isolated due to their poison. Dia is also of harness 10, the highest hardness there is, while Cinnabar is a lowly 2. Dia treats Phos with straightforward kindness, whereas Cinnabar acts abrasively towards Phos.
  • The Gadfly: Likes to tease Cinnabar about their infatuation with Phos.
  • Glass Cannon: They have high offensive power, but don't have the toughness needed to compensate for it and their body breaks easily when using their full strength.
  • Green-Eyed Monster: Towards Bort and their fighting capabilities, though Dia really wants to love them.
  • Grievous Harm with a Body: Beats Shiro by using their own torn off leg.
  • The Heart: They're on good terms with all the gems but their partner Bort and therefore does things like comforting Phos or relaying orders to Cinnabar.
  • High Class Gloves: Wears opera gloves, like all the other diamond-class gems. Dia's gloves are white.
  • I Can Still Fight!: Very prone to doing this, since Dia doesn't want to feel surpassed by Bort.
  • Love Freak: Dia loves romance, and gushes when some romantic happenings go on.
  • Multicolored Hair: Since diamond refracts light, Dia's transparent hair ends up becoming rainbow-coloured.
  • Pimped-Out Dress: Their sleepwear is some of the fanciest and upon going to the moon, they begin to wear one.
  • The Resenter: Resents Bort, seeing Bort as a braggart who enjoys lauding their superior skill over Dia through verbal abuse.
  • Screaming Warrior: Against Shiro.
  • Shipper on Deck: For Phos and Cinnabar. Also seems to enjoy watching Cairngorm and Aechmea.
  • Smarter Than You Look: Despite being reckless and somewhat ignorant, Diamond is the first one to notice that Phos is telling white lies about the Moon and confronts them directly.
  • Tareme Eyes: Befitting their gentle nature and sweet personality.
  • Teeth-Clenched Teamwork: With Bort, if there even is a teamwork to begin with. Although they're both extremely capable and competent fighters, Dia hates how Bort keeps criticizing their fighting technique and finds Bort condescending.
  • ¡Three Amigos!: With Bort and Yellow Diamond.
  • Troubled, but Cute: Described as such in the volume 7 character introduction.
  • Zettai Ryouiki: Wears Grade A, like all the other diamond-class gems. Dia's socks are white.



Voiced by: Ayane Sakura (Japanese), Genevieve Simmons (English)

The strongest of all gems, not counting Kongou-Sensei. Partnered with Dia and later with Zircon; was also briefly Phos' partner during the time when Sensei was asleep. Possesses the ability to not let damage spread to the rest of their body, which makes Bort near impossible to shatter.

  • The Ace: Bort is a prodigy at fighting, and structurally, they are the strongest gem.
  • Anger Born of Worry: They get very peeved with Dia in their introductory chapter, but only because Dia decided to fight recklessly with a new style and a broken arm.
  • Awesomeness by Analysis: Is very analytical during battles against the Lunarians, and, as Phos discovers, and doesn't take risks. Bort also notices others' weaknesses, and doesn't shy away from pointing them out, which drove Dia away, as it makes Dia feel like Bort is lauding their superior combat skills over them.
  • Big Damn Heroes: Bort comes to the aid of the other gems in the nick of time at several points of the story.
  • Blood Knight: A battle maniac. Extra material says that they don't care about anything but fighting.
  • Brutal Honesty: To Phos, regarding Bort's ability in battle or level of usefulness overall. Bort is also very blunt with pretty much anyone. Dia hates this part of them.
  • Crippling Overspecialization: Bort is almost unable to be broken, but when they finally are broken (their leg is cracked off by Phos) their fragments are too small to be used to repair them and their hair has to be used to plug the cracks instead.
  • High Class Gloves: Wears opera gloves, like all the other diamond-class gems. Bort's gloves are black.
  • Improbable Weapon User: Bort's hair is hard enough that the gem can use it to cut down enemies.
  • Innocently Insensitive: Despite their trying to improve and criticize Dia's fighting ability, Bort had absolutely no idea how it was contributing to Dia's inferiority complex.
  • Jerk with a Heart of Gold: Part of the reason their relationship begins to falter with Dia is that while Bort might have good intentions, they have no interest in being kind or sugarcoating their words.
  • Made of Iron: One of the hardest gems, and the hits Bort can take don't spread to the rest of the gem's body.
  • Master Swordsman: The very best.
  • Mr. Fanservice: Gets a lot of ass-shots in the manga when they're fighting in their summer uniform. Alternatively could be interpreted as Ms. Fanservice because of the ambiguous gender presentation of the gems.
  • Not So Above It All:
    • The gem may be battle hardened and serious, but they aren't above Cuteness Proximity and very much loves the jellyfish around the area, finding them cute. Their diary about grooming the Jellyfish is far more expressive than Bort externally is.
    • They're seen visibly holding back laughter along with Jade and Dia when Ventricosus lands on Sensei's head.
    • In the manga they blush slightly when Sensei pats their head.
    • The Shiro incident basically turns Bort into The Comically Serious once the Lunarian turns back into its puppy like form which culminates in Bort's cracking due to Yellow Diamond holding one of the Shiros from sheer shock.
  • Prehensile Hair: Uses it as blades to cut Phos to pieces.
  • The Quiet One: Which makes Zircon very anxious when the young gem partners up with Bort for the first time.
  • Rapunzel Hair: Bort's hair goes past the gem's ankles. Not anymore after chapter 70.
  • Raven Hair, Ivory Skin: Has the darkest hair of all the gems.
  • The Reliable One: To the point that most other gems consider it meaningless to keep on fighting once Bort appears. Which ends up leading to The Worf Effect in later battles, as Bort struggling to keep up with the higher level Lunarians that start appearing means trouble for the the rest of the gang.
  • Sempai/Kohai: Has this with Zircon in later chapters.
  • Sleepwalking: During winter, Antarc reveals Bort tends to dangerously wander around while asleep.
  • Teeth-Clenched Teamwork: With Dia, if there even is a teamwork to begin with. Although they're both extremely capable and competent fighters, Bort finds it frustrating how Dia refuses to take any of their advice to heart.
  • Spell My Name with an "S": Either goes by Bort or by Bortz depending on the translation.
  • Taking You with Me: When Phos manages to shatter their leg, they use their hair as blades to cut Phos into pieces while Phos is distracted by Padparascha's sacrifice.
  • Traumatic Haircut: In the aftermath of the battle between Gems Bort's repairs to their body cost them nearly all of their hair.
  • The Stoic: Normally very calm. Since Bort's mind tends to wander only when fighting is involved, other gems have difficulty noticing what Bort is thinking.
  • ¡Three Amigos!: With Dia and Yellow Diamond.
  • Tsurime Eyes: Bort's eyes are noticeably sharper than others.
  • Whip It Good: Trades their sword for a long whip later in the manga.
  • Zettai Ryouiki: Wears Grade A, like all the other diamond-class gems. Bort's socks are black.


Legged Doctor.

Voiced by: Yumi Uchiyama (Japanese), Shelley Calene-Black (English)

The gem in charge of fixing the other gems. Partner of the sleeping Padsparadscha.

  • Curb-Stomp Battle: Receives one from Padparadscha, the latter shattering them into little pieces.
  • Deadpan Snarker: Especially with Phos.
  • Determinator: Rutile refuses to give up on repairing Padparadscha. When trying to persuade the Lustrous into going to the Moon/turning against Sensei, this is the first thing Phos preys upon while talking to Rutile.
  • Dr. Jerk: Verily so, although Rutile does care about their patients.
  • Embarrassing Nickname: Hates being called a Quack.
  • Entitled to Have You: Felt entitled to Padparadscha due to trying to repair the other gem for hundreds of years: There are sexual undertones to Rutile's repairs, the gem remarks it "feels good" to place their hands in Pad's holes. When Padparadscha is repaired on the moon, Rutile snaps and attacks Padparadscha, calling Pads "their own" before Padparadscha shatters them.
  • Flechette Storm: Being a doctor and not a warrior, they introduce themselves to Padparadscha and Yellow Diamond by ambushing the pair with a flurry of sharpened scalpels, with more at their disposal.
  • For Science!: Very prone on acting like this.
  • Freudian Excuse: Started studying medicine due to wanting to find a way to heal Padparadscha.
  • Japanese Delinquents: Called themselves a delinquent before they began learning medicine to heal their partner and returns to being a rude, angry person after Padparascha was taken. Of course, Japan doesn't actually exist anymore at this point, so Rutile only resembles one in spirit.
  • Keigo
  • If I Can't Have You...: Rutile attempts to shatter Padparadscha when they see Padparadscha is awake because Rutile wants to be the only one to repair them.
  • Labcoat of Science and Medicine: Wears one to signify the role of a doctor.
  • Mad Scientist: Remembered as one by the Admirabilis, who consider Rutile to be a terrifying monster.
  • Married to the Job: It helps that said job is also a means of fulfilling the promise made to their sleeping partner.
  • The Medic: In charging of healing and maintaining the health of the Lustrous. It's part of the reason why, ultimately, Phos decides not to give them the choice to go to the Moon.
  • Multicolored Hair: Red and golden.
  • The Promise: Promised to heal Padparadscha. Rutile's been working on this for hundreds of years. An omake shows that they even sometimes wake up in the middle of hibernation thinking about new ways to fix Padparadscha.
  • Sanity Slippage: After Phos took Padparadscha to the moon, Rutile slipped off the edge, no longer grooming themselves and behaving more and more unhinged as chapters progress.
  • Secretly Selfish: As much as Rutile wants to permanently awaken Padparascha, we learn over time that the sentiment is less "I want to fix Pad" and more "I want to fix Pad". They admit to Phos that they feel like it's a job they want to be able to finish to completion, and Yellow Diamond even points out that Padparadscha being awake at all following the Moon trip should be a joyous occasion, but Rutile aims for the new filled holes when attacking and only mutters "mine" as they're bifuricated in battle.
  • Seriously Scruffy: As of Phos taking Padparadscha to the moon, Rutile has snapped completely, not doing up their hair and leaving it limp and obscuring most of their face. They also don't bother to put on powder in later chapters.
  • She's Got Legs: Known for their slender, pretty legs, and wears a nice pair of kitten heels to fit.
  • Slipknot Ponytail: Although it's not exactly a ponytail, Rutile's hair comes out of its usual singular neat curl when they jump out of a window in their rush to the infirmary after their realization that Phos has taken Padparascha.
  • Talking in Your Sleep: Tends to chatter while asleep about repairing Padsparadcha.
  • This Is Unforgivable!: Is absolutely pissed at Phos for taking Padparadscha to the Moon. Part of it is betrayal, but part of it was also because Rutile wants to bring Pad back with their own two hands. Phos taking Pad away under their nose denies the Gem that. They are still upset with Phos when we see them in chapter 77.
  • Tights Under Shorts: Though with the flared shorts of the summertime outfit, they sometimes look more like Proper Tights with a Skirt. Either way, Rutile's tights add to their prim and professional demeanor, as well as doing a nice job of highlighting their legs.
  • Tranquil Fury: They are not happy over seeing the fixed Padparadscha again, letting their tools of trade speak for them instead.


The Sleeper.
Click here to see Padparadscha after coming back from the moon. 

Voiced by: Romi Park (Japanese), Christina Kelly (English)

Rutile's partner. Was born incomplete, with holes all across their chest. Padparadscha thus spends most of the time sleeping, while Rutile tries to fix them. One of the oldest gems.

  • Advertised Extra: Weirdly, they was right up front in the second row of the first volume's table of contents, in front of even Jade and Euc. Although such forward placement would usually signify a big role in the story, Padparadscha has only been seen awake in one chapter, in chapter 29 of volume 5. Their appearances after that have been limited to shots of them lying asleep in their casket. A whole 34 chapters later, Padparadscha is awake again as their holes have been filled with synthetic versions of their gem after being taken to the moon by Phos. Whether or not this will keep them awake permanently has yet to be seen.
  • Awful Truth: Implies that the truth about Sensei is this to Phos during their talk.
  • BFS: The sword they use when they're not dead asleep seems to be bigger than their body.
  • Blood Knight: Effortlessly and wordlessly slashes three other gems to pieces after shattering Rutile.
  • Curb-Stomp Battle: Shatters four gems in three strokes of their sword.
  • Death Seeker: Tells Phos that they're considering telling Rutile to give up in trying to fix them, as Padparadscha doesn't want to keep bothering Rutile. Like with everything else, Padparadscha seems pretty relaxed with the prospect of never waking up again. It is this confession that leads to Phos taking Padparadscha to the moon with them without Rutile's knowing. However, once the Lunarians heal them, Padparascha seems happy to be awake and alive.
  • Dead Partner: Heavily implied to have been killed by Cinnabar as of chapter 79.
  • Deep Sleep: In a constant state of this due to the gem missing parts of their body.
  • Does Not Know His Own Strength: Padparadscha accidentally shatters Phos's face just trying to get their attention.
  • Evil Costume Switch: Gets a new revealing outfit from the Moon People.
  • Fashionable Asymmetry: One of their thigh socks falls loosely over their calf, adding to their overall disheveled look. No point in putting effort into your appearance when you're only awake in hour-long intervals every few centuries.
  • Handicapped Badass: Padsparadscha, a gem born with holes inside their body that forces them to hibernate longer and longer, is still one of the best fighters bar none when awoken. As Phos recalls, with a "hardness of 9 and excellent toughness", Padparadscha was the second strongest gem after Bort. In real life, corundum gems (that is, ruby, sapphire, and padparadscha) are the hardest gems on the Mohs scale after diamonds. Even after losing a huge chunk of their memory, Phos is able to recall Padparadscha, and thinks of them as "cool".
  • Heroic Sacrifice: Throws Phos out of danger with their sword rather than getting out of the way of Cinnabar's mercury and takes a direct hit to the face.
  • High Class Gloves: In the anime, they're shown to wear white Opera gloves with their summer uniform.
  • Ill Gem: The closest thing this series has to one. Since Padparadscha was born with large holes in their body, Rutile is constantly trying to find the right materials to keep them awake. In the meantime, Padparadscha sleeps in a casket in the infirmary, always close to Rutile.
  • Messy Hair: Maybe the messiest of them all.
  • Mentor Archetype: They keep Phos sane and on task when they're on the Moon, offering plenty of advice.
  • Mentor Occupational Hazard: Immediately protects Phos in a Heroic Sacrifice on their first Earth mission after going to the moon. While Pads was shown to be alive after the battle, they were critically injured and required emergency surgery to remove the mercury from their body, the result of which has yet to be seen.
  • Ms. Fanservice: Not to the same extent as Bort, but their relevant roles so far have had them walking around with an open shirt with their shorts hanging low enough to see their V-line and in Chapter 63, after their operation to have their holes filled with synthetic Padparadscha, we're treated to a gratuitous shot of their butt in a thong as they goes to speak with Phos. Alternatively could be interpreted as Mr. Fanservice because of the ambiguous gender presentation of the gems.
  • Old Soldier: One of the oldest gems, along with Yellow Diamond.
  • Parrying Bullets: Parries Rutile's ambush Flechette Storm of scalpels with a moon sword when they and Yellow Diamond come back to Earth.
  • The Promise: Rutile promised centuries ago to heal the gem.
  • Rapunzel Hair: A bushy mane down to their ankles.
  • Red Oni, Blue Oni: The blue to Phos's red, they encourage Phos to calm down and logically go about figuring out how to repair Sensei rather than smashing him.
  • Secret Keeper: Heavily implied to know about Kongou-Sensei's past. Too bad they can't stay awake long enough to tell Phos. Assuming the gem would ever say anything.
  • Taking the Bullet: Gets a face full of mercury pulling Phos away from Cinnabar's attack.
  • Undying Loyalty: Professes it to Phos after the gem brings them to the Moon and seemingly cures their affliction. This extends to shattering Rutile and three other gems, as well as performing a Heroic Sacrifice for Phos.
  • Walking Shirtless Scene: No point in closing your shirt when your torso is so full of holes all the time. Even when getting a new uniform from the Lunarians, they make sure to emphasize the gem's torso by cutting a huge hole in the middle.
  • Zen Survivor: Very old, and like Yellow Diamond, they gives off this vibe. Whereas Yellow has survived for so long because of their speed, however, Padparadscha seems to have survived because they're constantly asleep. They are also shown to be highly competent in battle, taking out four gems with two slashes of their sword.
  • Zettai Ryouiki: Grade B.


Unmovable Judge.

Voiced by: Ayahi Takagaki (Japanese), Heidi Hinkle (English)

Prolocutor/Judge of the Lustrous. Sensei's main assistant and Euclase's partner.

  • Apologetic Attacker: Against Phos when Jade has to break the gem with a well placed punch during one of Phos' psychotic attacks.
  • Boring, but Practical: How Phos describes Jade as a fighter. Jade has a good toughness level which makes them difficult to break but has an average hardness level.
  • The Leader: Acts as a leader and judge while Kongou Sensei is not present.
  • Middle-Management Mook: Acts like this for the other Gems.
  • Not So Above It All: Despite the stern and tough image, Jade does have their moments of silliness. They try to punch Kongou awake and screams over exaggeratedly when they break their hand. They also have a not so subtle range of expressions.
  • Red Baron: The Unmovable Judge/Chairman.
  • Sexy Secretary: Jade's role, along with Euclase.
  • The Strategist: One of them, along with the gem's partner Euclase.
  • Zettai Ryouiki: Grade C.


Lustrous Secretary.

Voiced by: Mamiko Noto (Japanese), Serena Varghese (English)

Secretary for the Lustrous, as well as Jade's partner.

  • Affectionate Nickname: Euc.
  • Big Ol' Eyebrows: Has thicker eyebrows than the rest of the gems.
  • Dissonant Serenity: Is rather laid back about everything, like the giant slug or needing to wake Sensei up to fight the Lunarians.
  • Jack-of-All-Stats: Considered Euc's role, as the gem is good for anything.
  • Kaleidoscope Hair: As seen in the volume 6 omake, the colors of Euc's hair move around of their own accord due to changes in atmospheric pressure, and the coloring can be used to predict the weather. Euc's eyes also change color along with their hair.
  • The Leader: Very subtle, but, being the main tactician for the gems, it's clear they make the calls when Sensei isn't available, though in a more subdued way than Jade. After Sensei steps down from the position of leadership, Euclase is the one that approaches him and starts trying to negotiate for equality between the gems and Kongo.
  • Mismatched Eyes: One blue, one silver, just like their hair.
  • Multicolored Hair: Half blue, half silver.
  • Nice Guy: Especially in contrast to Jade's toughness.
  • Older Than They Look: Is actually much older than Jade. Cairngorm refers to him as an elder from the same age of Yellow Diamond and Padparascha.
  • Right for the Wrong Reasons: Euclase has every right to be suspicious of Phos after the gem came back from the Moon and started giving off all the information they knew, but the reason Euclase is worried is because the gem thinks Phos is either an impostor or has been taken over by Lapis.
  • Sexy Secretary: Euclase's role, along with Jade.
  • Spanner in the Works: Ruins Phos's plans to take other gems to the moon by tipping the other gem off to the fact that they suspected Phos.
  • The Strategist: One of them, along with the gem's partner Jade.

    Yellow Diamond 

Yellow Diamond
Eldest Sibling.
Click here to see Yellow in their moon outfit. 

Voiced by: Junko Minagawa (Japanese), Allison Sumrall (English)

The oldest active gem, partner of Zircon and later Diamond. Very carefree; is also the fastest of all gems.

  • Broken Pedestal: Considers themselves to be one to Zircon.
  • Broken Bird: As of the second time skip, Yellow is shown to be mentally broken, believing themselves to be a Lunarian and growing depressed when they are reminded of their true identity.
  • Big Brother Instinct: To the other gems at times.
  • Cloudcuckoolander: Benito calls both Yellow and Dia too "airy" to partner with each other.
  • Cool Big Sis: Is the oldest gem of them all. All the other gems look up to them.
  • Dead Partner: Has had four of their partners taken to the moon, which Yellow blame themselves for.
  • Death Seeker: Suggests they want to fall asleep forever (like Padparadscha) or get taken to the moon, having grown tired of life.
  • Despair Event Horizon: The Night Raid took a lot out of the Gem. Upon returning to base, they haven't moved an inch and constantly claim that they're exhausted, with the rest of the Gems there looking after them.
  • Driven to Suicide: Attempts to kill themselves on the Moon by throwing themselves off a building.
  • Freak Out!: Quickly begins to panic after their mission does not go as planned upon arriving back on Earth.
  • Heroic BSoD:
    • Upon learning the ultimate fate of the captured gems on the moon—getting ground into a fine dust and spread all over the surface—Yellow's reaction is to fall to their knees in despair and start literally falling apart.
    • Yellow also takes the night raid the hardest, becoming sullen and distant to the point of not joining the rest of the Moon Gems in recent activities. This seems to have lasted 200 years, as the gem is still mentally broken after the time skip.
  • High Class Gloves: Wears opera gloves, like all the other diamond-class gems. Yellow's gloves are a yellowish-gray.
  • In-Series Nickname: The other gems refer to them as " Yellow " when they aren't calling them " Elder Brother ".
  • It's All My Fault: Blames themselves for having lost four partners to the Lunarians.
  • I Want My Beloved to Be Happy: A platonic version. Yellow Diamond decides to let Zircon partner with Bort, understanding that Zircon was being held back from their true potential by partnering with Yellow. Under Bort, the other gem could flourish.
  • More Than Mind Control: Aechmea tells the Moon Gems that Sensei has the ability to make all the being around him love him, which is the case for the Lunarians as well. Yellow can't reconcile this idea, still having lingering feelings for their old master and not wanting to fight him.
  • Old Soldier: One of the oldest Gems.
  • Perpetual Smiler: Seems to be always happy at first.
  • Pimped-Out Dress: Gets one as part of their moon outfit.
  • Sanity Slippage: As of chapter 79, Yellow believes they are a Lunarian and seems to have lost their mind completely during the Time Skip.
  • Secret Keeper: Like Padsparadcha, Yellow is heavily implied to know about Kongou-Sensei's past. It's also probable that Yellow was spying on Phos as the gem investigated about the Lunarians.
  • Sempai/Kohai: With Zircon, and the rest, being the eldest sibling.
  • Sexy Backless Outfit: After joining the Lunarians, they get this.
  • Stepford Smiler: As Yellow's own self-disgust reveals.
  • Super Speed: The fastest of the Lustrous until Phos gets a leg upgrade. They consider this to be the only reason they haven't gotten captured by the Lunarians yet, even though all their previous partners had.
  • The Tease: Very prone to this.
  • ¡Three Amigos!: With Bort and Diamond.
  • Vocal Dissonance: According to some fans of the series, Yellow Diamond's surprisingly deep and masculine voice in the Anime adaptation is this due to their somewhat feminine appearance. Given Yellow Diamond's status as a Cool Big Bro to the other gems, it can be seen as fitting.
  • Zen Survivor: Acts like this to all the other Gems.
  • Zettai Ryouiki: Wears Grade A, like all the other diamond-class gems. Yellow's socks are a yellowish-gray.


Talented Youngster.

Voiced by: Himika Akaneya (Japanese), Brittney Karbowski (English)

The second youngest gem after Phos, and a gem of great talent. First partners up with Yellow Diamond before going with Bort.

  • The Baby of the Bunch: Especially after Phos matures, and Zircon is relegated to being treated as the youngest again.
  • Big Damn Heroes: Does this with Bort and Tourmaline to save Phos, Peridot, Sphene and Cairngorm from the Pieces.
  • Child Prodigy: Really young, but talented enough to be paired with great fighters like Yellow Diamond and Bort.
  • Devoted to You: Deconstructed with their relationship with Yellow Diamond. Zircon is fiercely loyal and dedicated to protecting their partner but, as Bort points out, because of this Zircon has let their skills stagnate and hasn't allowed themselves the opportunity to really test their own mettle in combat, instead only worrying about protecting Yellow. Therefore Zircon is partnered off with Bort in order to learn how to be a more effective warrior.
  • Naïve Newcomer: Sort of idealistic and still has a lot to learn.
  • Off with His Head!: Loses their head the first time they're seen in the manga, though Yellow is able to help Rutile repair them.
  • Sempai Kouhai: With Yellow Diamond and later Bort.
  • Taking the Bullet: For Yellow Diamond. But since Zircon doesn't get captured, they both survive.


The Winter Guardian.

Voiced by: Mariya Ise (Japanese), Alyssa Marek (English)

Phos' first partner. They are the Winter Guardian, in charge of protecting the gems during their hibernation. The colder it gets, the harder the Gem becomes.

  • An Ice Person: Quite literally, as without the cold they're so soft they become a puddle. The colder the temperature, the harder they become. This makes them especially useful in Winter, where everyone else rests.
  • The Aloner: Unlike Cinnabar who is forced into solitude, their annual cycle makes the rest of the gems barely a part of their life, Kongou-sensei being the only exception. Their character bio describes them as acting "like an only child".
  • Astonishingly Appropriate Appearance: The Winter Guardian has a name based off of one of the coldest places in the world, and is dressed head to toe in pure white clothes.
  • Bathtub Scene: Antarc is first introduced rising out of a tub of liquid in the wintertime, firming up from the frigid air. The liquid Antarc comes out of? All of that is Antarc too.
  • Berserk Button: Just the possibility of forgetting Sensei puts them into a frenzy.
  • BFS: Wields a huge serrated-edge hatchet for breaking up ice floes. They even use it to snowboard.
  • Combat Stilettos: Wears heels that act as ice picks and help with the breaking of the ice.
  • Custom Uniform: Wears a white version of the normal suit most Gems wear. The suit seems to be designed to give them a measure of camouflage in the snow from the Lunarians.
  • Dead Partner: To Phos. They are as dead as they can be.
  • Glass Cannon: As shown when they fight: having even less hardness than Phos, they crack and break over literally nothing; but despite that they are able to crush Lunarians and blow up half of the Vessel Main figure in one swing of their sword each, and to split the rest of the New Model in half just by pulling it with their hands.
  • Go Out with a Smile: As they shatter into pieces before being collected, they gives Phos a smile, tells the Gem to take care of the Winter duties, and advises them to not leave Sensei lonely.
  • Heroic Albino: At least has the looks of one, and they don't seem to like sunlight.
  • Heroic Sacrifice: Gets captured in order to save Phos.
  • Killed Off for Real: Captured to save Phos, and cannot be revived, as they have likely been worn away into invisible particles by now.
  • The Lost Lenore: Becomes this to Phos after they are broken and taken to the Moon. Phos' mental state and actions over the course of the story have a lot to do with their guilt over not saving Antarc when they believe they could have.
  • Memetic Hand Gesture: Their most iconic pose is them raising their index finger to their lips. They did it a couple of times across the Winter arc, even before they're shattered and brought to the moon.
  • The Mentor: Of a sort to Phos during the Winter Arc. Which can only mean one thing, considering the danger of the Winter arc...
  • Not So Above It All: Becomes really embarrassed once Phos caught them asking Sensei for a hug, and later breaks down over the loss of Phos's arms, crying to Sensei and admitting they don't know how to deal with failure.
  • Passing the Torch: Saves Phos as to not to leave Sensei alone during the Winter Watch.
  • Peek-a-Bangs: One of their eyes is constantly covered by their hair strand and bangs, at all times.
  • The Reliable One: It says a lot that the Gems consider themselves safe with only them and Sensei watching over them all during the winter.
  • Reverse Armfold: Usually stands in this position.
  • The Stoic: Seems to be a rather serious individual.
  • Sempai Kouhai: With Phos, until Antarc's capture.
  • Serrated Blade of Pain: Their weapon, which Phos later inherits for a while. It helps with their ice-cutting.
  • Small Role, Big Impact: Despite showing up for only one arc, Antarc's relationship with Phos and getting taken to the Moon ends up affecting Phos for the rest of the series, and not in a good way.
  • Sugar-and-Ice Personality: Sweet and affectionate towards Sensei but stoic and aloof to everyone else.
  • Vetinari Job Security: By the beginning of the story, and until Phos gets their upgrades, they are— along with Sensei— literally the only thing standing between the Moon People and the hibernating Gems during winter.
  • Woman in White: Wears white and comes off as aloof and distant.


The Naughty One.

Voiced by: Mutsumi Tamura (Japanese), Olivia Swasey (English)

A daring gem that mocks Phos. They are the partner of Goshenite.


The Gentle One.

Voiced by: Saori Hayami (Japanese), Juliet Simmons (English)

A gentle gem. Partner of Morganite.

    Red Beryl 

Red Beryl
Fashion Tailor.

Voiced by: Maaya Uchida (Japanese), Cat Thomas (English)

A gem in charge of the making of clothes for everyone. Very obsessed about fashion.

  • Expository Hairstyle Change: Their hairstyle changes in every arc to showcase their fashionable nature.
  • The Fashionista: Their role and attitude as the clothes designer.
  • Freak Out!: Throws themselves off a cliff after Phos takes gems to the moon.
  • Girlish Pigtails: Most times they wear their hair like this.
  • Married to the Job: They are very fixated on what they do.
  • Missed the Call: Phos was intending to take them to the moon too, but ran out of time to convince them and ended up leaving them behind.
  • Motor Mouth: When defending fashion, they go on and on with long ramblings.

    Amethyst 84 & 33 

Amethyst 84 & Amethyst 33
Crystal Twins.
Click here to see Amethyst 84 after the 220 year time skip 

Voiced by: Kanae Itou (Japanese), Teresa Zimmerman (English)

Two gems born of the same type, who pair together. No one knows which one is which.

  • Battle Couple: They are both paired together during battles.
  • Braids of Action: One surrounding each of their heads.
  • Coordinated Clothes: Usually wear the same style of clothing, probably to maintain the confusion about which one is which.
  • Creepy Monotone: The anime has them talking like this.
  • Divergent Character Evolution: Discussed: 33 wonders whether them being so similar isn't a problem and wants to be able to act independently. 84 overhears this conversation and decides to impersonate 33 to protect them from the moon, leaving them behind and allowing 84 to develop their personality independently of 33.
  • Finishing Each Other's Sentences: Very prone to doing this.
  • Four-Temperament Ensemble: One of them is sanguine, while the other is phlegmatic.
  • The Gadfly: They both enjoy teasing Phos a lot.
  • Good Job Breaking It Hero: Two times, actually. First, the got shattered by the Lunarians while trying to impress Phos, and later, they scatter the first Lunarians to ever communicate with Phos because it was an enemy.
  • Identical Twin Id Tag: Generally, 33 has their braid on their right eye, and 84 on their left. It's such a slight difference that nobody really notices it, nor do they care, and the pair enjoy having others be confused. 84 drops this on the moon, wearing their braid like a headband instead.
  • Important Haircut: After the time skip Amethyst 84 ditches their side parted hair and wears their hair more straight, no longer pairing with 33's hairstyle.
  • Labcoat of Science and Medicine: 84 begins to wear one on the Moon once they take up science.
  • Like Cannot Cut Like: Being the exact same material and of exactly equal hardness, they can't break each other.
  • Master Swordsman: Noted to be really proficient in sword skills.
  • Non-Indicative Name: They are the only Amethysts, not the 33rd and 84th of their kind. The numbers refer to the overall birth order of the gems.
  • Single-Minded Twins: To the point no one really cares anymore to which one they are talking to, and neither do the twins. Dropped when 84 decides to go to the Moon.
  • Trickster Twins: They like pulling pranks on the other Gems.
  • Twin Switch: 84 switches places with 33 during the trip to the Moon, in order to protect the latter. To trick Phos, they style their hair the way 33 styles it.


Moon Geek.

Voiced by: Rie Kugimiya (Japanese), Shelby Blocker (English)

The gem in charge of collecting information about the Lunarians. Has a split personality in the form of a crazy berserker that kills any Lunarian on sight.

  • Admiring the Abomination: Is really interested in Shiro, coming from the Moon and all of that.
  • Affectionate Nickname: Alex-Chan.
  • Axe-Crazy: Red Alex is definitively this.
  • Cloud Cuckoolander: Mostly spaces out and seems overexcited with anything related to the Lunarians.
  • Curb-Stomp Battle: Utterly destroys Shiro as Red Alex, an impressive feat considering Dia and Bort's inability to contain him.
  • Death Glare: Red Alex gives an unnerving one when Phos throws Shiro towards the gem.
  • Dull Surprise: While finishing reports and seeing Shiro chasing Dia over the hallway.
  • Fiery Redhead: Red Alex, of the batshit violent variety.
  • Freudian Excuse: Both the gem's hate and interest in the enemy seems based on the fact that Alex's partner Chrysoberyl got snatched away many years ago by them.
  • Heroic BSoD: Upon learning the ultimate fate of the captured gems on the moon—getting ground into a fine dust and spread all over the surface—Alex's reaction is falling to their knees in despair and start literally falling apart.
  • Hidden Depths: Loves cooking and food when they finally get to try it.
  • Incoming Ham: Alex's first appearance on Chapter 14.
  • Old Soldier: One of the oldest gems.
  • Otaku: The normal Alexandrite, for anything related to the Lunarians. As it turns out, as Normal Alex their obsession with them and desire to learn more mainly stems from their desire to overcome their condition that drives them crazy when they see a Lunarian.
  • The Lost Lenore: Chrysoberyl.
  • Power Dyes Your Hair: Alex's hair turns red when they transform into their other personality.
  • Rapunzel Hair: Goes past the legs.
  • Screaming Warrior: Gives an impressive roar after cutting Shiro into pieces.
  • Sincerest Form of Flattery: Imitates Kongou-Sensei, Buddhist clothes and all, while trying to teach Phos about the Lunarians.
  • Split Personality: Divided between the blue, ditzy and geeky personality and the red, who is a crazy Lunarian hater who slaughters them in sight. Because of this, Kongou-Sensei ordered that Alex should be forbidden for seeing any Lunarians.
  • Split-Personality Takeover: Discussed in Chapter 73: Alexandrite wants to be Red permanently and wants Phos's help to do it in order to be able to protect Phos and get the other gems repaired. Phos ultimately denies them this, stating that it would be immoral.
  • Suspiciously Specific Denial: In the omakes. Alex isn't doing the job because they like it or anything...
  • There Is No Kill Like Overkill: As Red Alex, they utterly trounce Shiro, and then do it again, breaking Shiro into little pieces.


He tries.

Voiced by: Ari Ozawa (Japanese), Elissa Cuellar (English)

A gem whose room is next to Cinnabar's. Partner of Neptunite.

  • Affectionate Nickname: Benito.
  • Butt-Monkey: Tends to get the short end of the stick most of the times.
  • Corner of Woe: Done when they ruin the plan to face the multiple appearing Sunspots.
  • Extreme Doormat: Cant say "no" of someone asking for their help.
  • The Generic Guy: Sees themselves as this, given their lack of quirks compared to the other Lustrous. Their desire to become less generic leads to them accepting Phos' offer to go to the moon.
  • Good Job Breaking It Hero: Due to their inexperience, they ruins the entire coordination plan to capture the New Vessel. While they blames themselves a lot about it, the other Gems are very kind and do not mind that much.
  • Hidden Depths: Benito is actually pretty perceptive; they're the only Gem that verbally objects to Alexandrite trying to stay locked in Red mode, citing all of the other Gem's problems with their physiology.
  • Shipper on Deck: Seems to think of Phos and Cicada in the same type of relationship as Aechmea and Cairngorm.
  • Those Two Guys: With Neptunite.


Sharp tongue.

Voiced by: Atsumi Tanezaki (Japanese), Carli Mosier (English)

A very serious gem, partner of Benitoite.


Small blacksmith.

Voiced by: Ryo Hirohashi (Japanese), Shanae'a Moore (English)

The gem in charge of designing and making the weapons everyone use in battle.

    Watermelon Tourmaline 

Watermelon Tourmaline
Shocking when angry.

Voiced by: Sayaka Harada (Japanese)

A gem with the ability to release lightning. Partner of Hemimorphite.


Aspiring Intellectual.

Voiced by: Reina Ueda

One of the youngest gems, partner of Tourmaline.


Mature and Smart.

Voiced by: Houko Kuwashima

One of the oldest gems, partnered with Sphene. An intellectual in charge of making paper.

  • Dead Partner: Blue Zoisite.
  • Dissonant Serenity: Rather unfazed by everything.
  • Married to the Job: Obsessed with making paper, their occupation.
  • Not So Above It All: Very focused and mature, until the moment paper is involved. They are known to sleep covering themselves in freshly made paper and laughing.
  • Those Two Guys: With Sphene.
  • Sempai/Kohai: Is one of the oldest gems, along with their partner Sphene, Yellow Diamond, Padparadscha and Alexandrite, and as such treats all their juniors like a sempai would.
  • The Smart Guy: Described as this.


The Repair Man.

Voiced by: Hitomi Nabatame

One of the oldest gems, partner of Peridot. Their job is to repair things.

    Ghost Quartz 

Ghost Quartz
Library Ghost.

A gem in charge of the Library and the Hibernation Chambers. Briefly becomes Phos' second partner. Formed over another gem, and so has a Split Personality that sometimes influences them.

  • Badass Bookworm: In charge of the Library after Lapis Lazuli's kidnapping and a a very capable fighter when they really try.
  • Dead Partner: Lapis. Then Ghost becomes a second one to Phos and Cairngorm.
  • Death of a Thousand Cuts: Not exactly dead, as per the Gems inmortality, but this is how they get peeled off and captured by the enemy.
  • Extreme Doormat: Their personality overall. They are not unfazed at all with criticism.
  • Go Look at the Distraction: Throws their own arm at the Lunarians to save Phos' lower half from them.
  • Heroic Sacrifice: Gets peeled off Cairngorm in an amazing fashion while protecting a broken Phos.
  • Heroic Self-Deprecation: Considers themselves to be far beneath Lapis both in Library work or fighting.
  • It's All My Fault: Averted. They put the blame of Lapis' capture on Cairngorm, and Cairngorm agrees.
  • Last Request: As Ghost gets stripped away from Cairngorm, the former asks the latter to protect Phos at all costs. Aechmea theorizes that it's less a "request" followed and more "psychological compulsion", given that Ghost's inclusions supposedly still resided in Cairngorm's eyes.
  • Leeroy Jenkins: Mostly because Cairngorm influences them from the inside, they tend to jump against the Moon People without a second thought.
  • The Lost Lenore: Lapis Lazuli.
  • Meaningful Name: The gem that tends to startle everyone and just seems to appear out of thin air is called Ghost.
    • In their brief cameo in Cairngorm's head while on the Moon, they appear as a ghost-like figure that haunts Cairngorm.
  • Rei Ayanami Expy: A troubled, subdued gem with silver hair who becomes more emotional due to a crippling injury (being peeled off of Cairngorm, their more emotional personality).
  • Sugar-and-Ice Personality: Comes off as creepy and subdued at first, but shows warmth and devotion to Phos once they spend time together.
  • Talking to Themself: While talking to their inner Gem.
  • Sinister Scythe: Their weapon of choice.
  • Spin to Deflect Stuff: Pulls this move on the Moon People arrows with their scythe. Subverted perhaps in that it is not a good enough move and they get shaved off of Cairngorm.
  • Split Personality: Has one with Cairngorm due to forming on top of them. As shown when Ghost is pulled away from Cairngorm, Ghost was not fond of the other gem and blamed them for multiple failures.
  • Stealth Hi/Bye: They are very prone to doing this, and thus is how they named them. The other Gems, including Phos, tend to not notice their presence.
  • Teeth-Clenched Teamwork: With Cairngorm, the other gem inside them. While Ghost was usually in charge of their body, Cairngorm's impulsive tendencies would often put them in danger and in Ghost's eyes lost them their partner, Lapis. Ghost resented Cairngorm for this loss and as their Last Request demanded they protect Phos at any cost.
  • The Symbiote: With Cairngorm, as they formed over it.
  • Undying Loyalty: To Phos. Ghost states they will do anything for Phos, and eventually allows themselves to get pulled off of Cairngorm to save Phos's life.


Cairngorm/ Princess
Jerk With A Heart (of Gold).
Click here to see Cairngorm as the Moon Princess 

The gem that Ghost formed over. They are in charge of the Hibernation Chambers where the pieces of recovered gems are kept, the Library and later becomes the Winter Guardian in absence of Phos. They are also Phos' third partner. Later they become the Princess of the Moon as Aechmea's wife.

  • 100% Adoration Rating: The Lunarians adore Cairn as the Princess, seeing the Gem as a cute, polite, and loyal wife to Aechmea.
  • An Arm and a Leg: Cairngorm's left arm is always coming off. The original arm was taken off just before Ghost sacrificed themselves, so they have it replaced with smoky quartz later. It comes off a second time, which leads to Phos losing their head when they try to retrieve it.Following their Freak Out!, the arm comes off yet again and the gem has it replaced with artificial Cairngormite. Unlike other times when Gem parts are replaced, Aechmea mentions that it needed glue and a cast to set, meaning it doesn't quite sync up with the rest of the body.
  • Berserk Button: Gets very angry when someone questions their decisions due to their insecurity over their lack of autonomy.
  • Body Motifs: Arms. Cairngorm doesn't have their inclusions take to other materials well, so their left arm is always in focus during important scenes.
  • BFS: Like Antarc, Cairngorm uses a serrated blade when they take over the winter shift.
  • Brutal Honesty: Very prone to just flat out stating the truth, including to Sensei on regards of the possibility of gems actually coming back from the Moon.
  • Combat Stilettos: Like Antarc and Phos before, Cairngorm wears heels as part of their outfit for the winter shift.
  • Custom Uniform: Wears a white uniform like Antarc once they take over the winter shift. It helps hide them in the snow from the Lunarians.
  • Deadpan Snarker: Might be better than Rutile at this.
  • Death Seeker: Apparently, while Phos was unconscious for those 102 years, Cairngorm wanted nothing more than to die. The Gem also had a habit of listening to the ice floes during Winter.
  • Declaration of Protection: Vows to keep Ghost's word and keep Phos from harm. According to Prince Aechmea, the main reason they even do this is because a small fraction of Ghost's inclusions supposedly resides in their eyes.
  • Dub Name Change: Called "Morion" in the French translation.note 
  • Everything's Better with Princesses: In becoming Aechmea's lover, Cairngorm was designated the Princess of the Moon people. How good this development is remains to be seen.
  • Evil Costume Switch: Wears a Pimped-Out Dress and a veil after joining the Moon People.
  • Fantastic Racism: Very spiteful and hateful of the Moon People. Gets over it very quickly once their eyes are replaced.
  • Face–Heel Turn: Joins the Lunarians and commands a legion of them to rescue the moon gems.
  • Foil: To Antarcticite. Both are Phos' major partners, but they eventually lay on opposite sides of the conflict; Antarc favors and follows Sensei, while Cairngorm does the same for Aechmea. The gem collection art book makes them parallel each other even less subtly, with both of their busts proped up by the affectionate hand of their mentor.
  • Fourth Date Marriage: Although the exact time frame of the relationship is never mentioned, some Gems have commented on how fast Cairngorm and Aechmea took to each other, culminating in a "purely" political marriage to signify the Gem/Lunarian alliance.
  • Freak Out!: Starts falling apart when the Prince tells the gem Ghost Quartz has been forcing them to protect Phos through inclusions in their eyes.
  • Friendship Denial: The gem had done it several times before, claiming that all the things they do for Phos is out of obligation and not because they're actual friends.
  • Gilded Cage: For all of the Gem's talk about being independent of Ghost, Cairngorm as the Moon Princess is still in many ways restricted. They get whatever they ask for material wise and the Lunarians always try to accommodate them, but they can't do anything without Aechmea's say so and the one time the Gem did go off on their own, Aechmea was furious.
  • Girliness Upgrade: After siding with the Lunarians, with this becoming Cairngorm in both appearance and personality due to Aechmea's influence. They're even more this trope, being the first gem to be gendered (as female, in this case) by the Lunarians, though it's doubtful that Cairngorm even fully comprehends the concept of femininity.
  • Hair-Trigger Temper: Ghost described the gem as somewhat reckless and violent when ticked off. When Cairngorm is finally shed of Ghost, we see it immediately, punching Phos three times because they blamed the other gem for everything going wrong.
  • Happily Married: To Aechmea, as seen following the 220 year time skip.
  • Hidden Depths: They really like feminine clothing, as we learn on the Moon. As for why they never spoke up about it, see What Would X Do? below.
  • Huge Guy, Tiny Girl: Aechmea positively towers over Cairngorm, with the Gem coming up to at least his waist.
  • Hypocrite: Reprimands Phos for taking Prince's words at face value, yet falls for his words and joins the Lunarian side after one conversation with him.
  • Identical Stranger: According to Phos, they look just like Antarc save for the black skin and shorter hair. After they finally put on powder and wears the white Custom Uniform Antarc was usually seen wearing, the similarities become more apparent.
  • I Just Want to Be Free: Despite caring for Ghost, Cairn screams that they want to be free from Ghost's influence when they're told that Ghost is still influencing them through their eyes. They had hardly been their own person until Ghost was chipped off of them, so they have subconscious fears of their new identity being stripped away.
  • Interspecies Romance: With Aechmea, a Lunarian. Perhaps downplayed as both species were originally descended from humans.
  • It's All My Fault: Entirely agrees on this regarding Lapis being captured while talking with Ghost. They appear to get over it upon replacing their eyes.
  • Jerkass Has a Point: While they were pretty harsh in explaining themselves and fully distancing themselves from their time on Earth, Cairngorm does bring up a good point; Phos needs to be more in tune with how the people around them feel about their plans, not just make everyone follow their lead.
  • Jerk with a Heart of Gold: While they initially hated Phos and pushed all the blame for the gem being taken to the moon on them, Cairngorm thought of offering their own head at one point just to save Phos, and still frequently tries their best to be a good partner for them.
  • Leeroy Jenkins: Just like their previous incarnation.
  • Master Actor: According to Phos.
  • Meaningful Rename: Twice; first from Ghost to Cairngorm, then later rejects the name Cairngorm and takes on the name Princess.
  • Mind Control: Cairngorm is told that they're being compelled by Ghost Quartz's memories, located in their eyes, to protect Phos at any cost.
  • Mistaken Identity: During the Night Raid, many Earth Gems mistook Cairngorm for a small Lunarian, due to their center position and their dress concealing their identity. Better seen in the volume 9 redraws, where Cairngorm is intentionally kept vague looking throughout their screentime that chapter.
  • Ms. Fanservice: As of the Moon Arc they most often go around in undergarments and Pimped Out Dresses, veering heavily towards revealing feminine clothing.
  • The Napoleon: The smallest gem of all and one of the most irritable and violent.
  • Non-Standard Character Design: Upon their introduction and after going to the moon and deciding to stop wearing powder, Cairngorm has black skin and white hair unlike the white skinned gems. Cairngorm is also explicitly the smallest gem in terms of height and size due to Ghost having formed on top of them.
  • Only Sane Man: Tends to act like this to the gems, and specially Phos.
  • Serrated Blade of Pain: Their weapon as the Winter Guardian, just like Phos.
  • Replacement Goldfish: Just as Phos offered to be a replacement Lapis, Cairngorm unfailingly offers to be Phos' replacement partner, whether it be for Antarc or for Ghost. Goes to obsessive levels in Chapter 66, where they tell the Prince they're willing to get artificial Antarcticite grafted onto them and throw away their identity if that will be what it takes to give Phos peace of mind.
  • Sickeningly Sweethearts: With Aechmea. The only problem with this is that Cairngorm has no genuine idea what kind of relationship they're in right now, seeming to like Aechmea but not having the background to understand what a "wife" is.
  • Sinister Scythe: Uses Ghost's scythe after Ghost's capture.
  • Somebody Else's Problem: After talking to Aechmea, Cairngorm couldn't care less about Phos' activities or the activities of the rest of the Lustrous, preferring to support Aechmea and focus on learning more about science and the Lunarians.
  • Take Up My Sword: Takes Phosphophyllite's place as the Winter Guardian during the 102 years Phos is asleep.
  • Talking to Themself: They were the "other Gem" inside of Ghost, who sometimes made themselves known by being more brash than usual.
  • Talk to the Fist: The first thing they do when meeting Phos face to face is to punch them so hard Phos's face breaks.
  • Teeth-Clenched Teamwork: With Phos, to a degree. They end up functioning very well as a team.
  • That Man Is Dead: Upon replacing their eyes, Cairngorm denies all parts of their life inside Ghost and after they're given a new name, saying that the things they did and the partnerships they had were all Ghost's doing. They also reject being called Cairngorm, saying that they never liked the name personally. As of the 220 year time skip they have taken on the title of Moon Princess as their new name.
  • The Symbiote: They lived inside of Ghost, and only end up becoming autonomous when Ghost gets peeled off them.
  • The Promise: Promised to Ghost to protect Phos, which motivates a lot of what they do.
  • Unlimited Wardrobe: After going to the moon, Cairngorm is almost never seen in the same outfit twice, not even on the same day.
  • Vitriolic Best Buds: With Phos. Although they bicker a lot, Cairngorm really does care about them Noticably, unlike the other gems Phos takes to the moon, Cairngorm has no underlying motive to accept Phos' invitation— they just go because Phos asked them to. However, this is called into question later when Aechmea insinuates that Cairngorm is being compelled to obey and protect Phos through leftover inclusions, meaning they may not have had a say in the matter.
  • Walking Spoiler: You can't really mention the Gem without mentioning that Ghost peeled off from them.
  • What Would X Do?: A lot of the Gem's internal struggle has to do with them denying parts of their real self in order to accommodate Phos, by being the perfect Antarcticite stand in. The example Cairngorm gives has the Gem stray away from more flashy and feminine clothing because "Antarc would never do that".
  • When They Smile: Cairngorm isn't the most chipper person when released, and doesn't smile at all around the other Gems. However, they smile for real on the Moon when they're with Aechmea, presumably because they feel like he's the one person who encouraged their need for individuality.
  • You Are Worth Hell: Decides that they are willing to follow Aechmea into oblivion following the pair's wedding in chapter 75. However, in Chapter 76, their reaction to "fade away into nothingness" seems less like they know they're going to be Together in Death if the gem goes through with it, and more like they'll end up somewhere else.


    Lapis Lazuli 

Lapis Lazuli
Bibliotecary Head.

The former Head of the Library and Mentor for Ghost Quartz and Cairngorm, as well as the investigator on the Moon People. Currently captive on the Moon.

  • Awesomeness by Analysis: Subverted. While Lapis was a competent fighter, their inability to stop thinking distracted them as they were trying to analyze the Moon People and resulted in their decapitation.
  • Badass Bookworm: Was head of the Library, and according to Ghost an overall good fighter.
  • Beautiful Dreamer: Their first appearance is as a beautiful and serene looking head.
  • Bequeathed Power: Gives their intelligence to Phos in the form of their head during a dream sequence.
  • Character Tics: Flipping their hair behind their shoulders. Cairngorm freaks out when they sees Phos do it with Lapis' head.
  • The Corrupter: To Phos. Once Phos receives Lapis' head in place of their own, Phos begins having conversations with Lapis that go a long way towards making Phos suspect something more is wrong with Sensei. Phos also begins acting more secretive and manipulative thanks to Lapis' influence.
  • Hime Cut: Though their bangs have a minor part to the right, they have the straight hair reaching to their waist, blunt bangs, and even small side locks. It emphasizes their elegant beauty.
  • Hyper-Awareness: Their intelligence gave them that power, which Phos inherits after getting their head.
  • Killed Off for Real: Likely, since though they could be remade their head permanently belongs to Phos now, as Phos's head cannot be remade.
  • Take Up My Sword: Lapis implies they wanted to go to the moon and learn more about the Lunarians and their motives, encourages Phos to do the same, and gives Phos their head so they can better analyze and plan out their situation.
  • The Lost Lenore: For Ghost Quartz and their inner Gem, Cairngorm. Ghost blames themselves for Lapis's capture, and as a result their inclusions force Cairngorm to protect Phos so they will not be taken.
  • Mental Fusion: Possibly with Phos, as Lapis has had a very profound effect on Phos's mental state and descent into moral ambiguity.
  • Off with His Head!: Only their sleeping head remains, as everything else was taken to the moon. It's later attached to Phos' own headless body.
  • Manipulative Bastard: According to Euclase, Lapis could prey upon anyone's weaknesses and knew just what to say to a person in order to get what they wanted. This rubs off on Phos as time goes on.
  • The Smart One: Comes with being the Library chief.
  • The Sociopath: Again according to Euclase, Lapis did not care about the wellbeing of others, preferring to satisfy their own curiosity and goals above all else.
  • Spirit Advisor: For Phos, once Phos gets their head.
  • Talking Is a Free Action: Subverted. Lapis admits they got captured because the Lunarians shot at them while they were having one of the internal observation monologues Phos later inherits.
  • Token Evil Teammate: Implied as Phos becomes much more morally ambiguous after gaining their head.
  • Tsurime Eyes: They have noticeably sharp eyes, giving them an arrogant look even when smiling. They hint at Lapis's darker nature.

    Red Diamond 
The first Gem Sensei encounters and raises.
  • Cheerful Child: Growing up under Sensei's tutelage, they were a very happy and satisfied Gem with a childlike personality.
  • Posthumous Character: For all intents and purposes, they are this.
  • Seldom-Seen Species: Both in terms of public knowledge and in real life. Red Diamonds are extremely uncommon to come by, even artificially.


In general

  • The Reveal: Ruby, Sapphire, Pink Topaz, and Green Diamond are shown when Yellow Diamond reminisces about them, while (Imperial) Topaz, Blue Zoisite, and Chrysoberyl are shown in the art book.


Currently captive on the Moon.

Green Diamond

Yellow Diamond's former partner. Currently captive on the Moon.

Pink Topaz

Yellow Diamond's former partner. Currently captive on the Moon.


Yellow Diamond's former partner. Currently captive on the Moon.


Yellow Diamond's former partner. Currently captive on the Moon.

Blue Zoisite

Peridot's former partner. Currently captive on the Moon.
  • Japanese Delinquents: According to their description in the official art book, they're stated to have the demeanor of one.


Alexandrite's former partner. Currently captive on the Moon.
  • The Smart Guy: Stated to have been like an honor student in the official art book.


Sphene's former partner. Currently captive on the Moon.
  • Nice Guy: They're stated to have been warm and caring in the official art book.

Pink Fluorite

Currently captive on the Moon.


Red Beryl's former partner. Currently captive on the Moon.

Example of: