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Blue Diamond

Voiced by: Lisa Hannigan (English), Kikuko Inoue (Japanese)
Click here to see her mural. 

"What good all this would do? The more I make these Gems suffer, the more I long to see you again, Pink..."

The second Diamond mentioned, and the first to appear in the series proper in "The Answer". She was at the Sky Arena during Rose's rebellion, and Sapphire used to report directly to her. She commands Homeworld's court system, leads Homeworld's diplomatic Gems, and is the blue Gem depicted on the mural from "Serious Steven".

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  • Adult Fear:
    • Her grief for her fellow Diamond Pink echoes what most parents fear — losing one's child, and the struggle to move on from it. Moreover, in "The Trial", while confronting "Rose" (actually Steven claiming to be her), she acts like an angry, grieving mother who wants justice for Pink's murderer.
    • In "Reunited", when she finally gets the chance to avenge Pink's death, she's faced with the harsh truth: Getting revenge won't make everything better. The Pink she knew is already gone, and pursuing further action would only make more people suffer.
    • In "Legs From Here to Homeworld", she discovers that she and the other Diamonds launched their attack on Earth while Pink Diamond was on it.
    • Following from the above point, with "Pink Diamond"'s reveal and return, Blue has gotten her closure and is eager to return to life as it was before the Crystal Gem rebellion, believing the Diamonds would become a loving family again... but "Pink" and "her" unorthodox ways continues to frustrate her. By "Change Your Mind", when "Pink" makes it clear that "she"'s refusing to follow "her" family's expectations, Blue laments that spending time on Earth has been a bad influence on "Pink", and being called out by Steven for her condescending treatment makes her snap to the point of physically attacking him. From Blue's perspective, it's a heartbreaking parallel to a parent/older sibling unwittingly letting their child/younger sibling fall prey to supposedly bad influences, to the point where said child no longer agrees with their authority figure's way of thinking and strains their relationship. She's eventually forced to realize that this condescending treatment of Pink in the past what drove her to rebel against her and Yellow.
  • Affably Evil: Is surprisingly friendly and cordial to Greg before kidnapping him for her Human Zoo, which she sees as an act of kindness to Greg due to her believing that the Cluster is still going to destroy the Earth. She also ceases her hostility towards the Crystal Gems after finding out that Rose/Steven is Pink Diamond.
  • Alien Invasion: In "Reunited", she and Yellow show up to check up on the Cluster and attempt to decimate the Crystal Gems. The fact Ruby and Sapphire were having their wedding was just a coincidence.
  • Aliens of London: In her later appearances she speaks with an Irish accent (her voice actress' natural accent), when all other previously seen Gems speak with American or English accents.
  • Aloof Big Brother: Gender-inverted and deconstructed. Not as much as Yellow, but she is shown to be condescending and hard towards Pink in "Can't Go Back", though she tries to encourage her to be a good Diamond. "Now We're Only Falling Apart" even has her callously reject Pink's offer to spare the Earth. Eventually, this is what made Pink believe that Blue never cared about her. "Together Alone" has her angrily telling "Pink" to "quit fooling around". Her actions drove Pink to fake her death in the Crystal Gems' rebellion (that she started herself), which has traumatized Blue so much that she remained deep in mourning for thousands of years. What makes this sadder is that Pink truly died giving birth to Steven, meaning that Blue or her surviving family could never apologize for their abusive actions.
  • Ambadassador: Word of God describes blue Gems as typically created with diplomatic skills and Blue has been established to be in charge of Homeworld’s court system. "Reunited" shows that despite not being in charge of the military, she is a dangerous warrior by herself that requires absolute teamwork from the Crystal Gems just to bring her to a knee. In fact, the episode showed that if motivated enough she's willing to get her hands dirty, which she does to get vengeance against the Crystal Gems despite Yellow already trying to force the Cluster to emerge.
  • Arch-Enemy: To Ruby and Sapphire, and their fused form Garnet. While any one of the Diamonds is enough to put her on edge, Garnet shows the most hostility towards Blue Diamond for being the first real obstacle to their love, trying to have Ruby and Sapphire shattered for daring to fuse in her presence (even though it was an accident). Her component Ruby despises Blue Diamond for apparently being a merciless shatterer who yelled at Sapphire, and while Sapphire is more indifferent towards Blue Diamond, it's made clear that she views her as much of an enemy as Ruby does. Blue herself barely remembers them, but still makes her disapproval of fusion insultingly clear. As of "Change Your Mind", however, the animosity seems to have ended, as Blue is willing to help Ruby and Sapphire safely return to Earth and Garnet and the other Crystal Gems say goodbye to Blue Diamond as she returns to Homeworld alongside the other Diamonds.
  • Arc Villain:
    • She's the main antagonist of Ruby and Sapphire's love story.
    • She sets the events of "Out of This World" into motion when she "rescues" Greg, although she is never confronted and Holly Blue Agate is the one who directly opposes the Crystal Gems.
  • Astonishingly Appropriate Appearance: She has droopy, sorrowful eyes, is colored blue, and wears a long veil. She's in perpetual mourning.
  • The Atoner:
    • She wishes to make it up to Pink for ignoring her pleas to spare the Earth by preserving Pink's legacy.
    • Upon realizing her bad treatment of Pink in the past, she seeks to make up for it by helping Steven and Connie return to Earth. Her willingness to return Ruby and Sapphire to Earth implies that she wants to make up for what she did to them in the past as well.
    • In "Homeworld Bound", it's shown she regrets using her powers to make others feel the pain she feels, and is now bringing joy to others via clouds that her new power creates.
  • Axe-Crazy: Downplayed; while she's quite calm normally, her depression makes her very emotionally unstable when provoked-she is quite quick to anger and Disproportionate Retribution. It's not yet clear if her violent anger was a result of losing Pink Diamond or not.
  • Bad Boss: Blue Diamond's response to Ruby accidentally averting Sapphire's prophecy (by saving her, aka the job she was assigned to) and for fusing together with her? Why, smash Ruby's gem of course!
  • Barehanded Blade Block: She stops a jumping sword attack from Connie with one hand, then effortlessly shatters Rose Quartz's sword.
  • Because You Were Nice to Me: It's implied that in-between dealing with Sycophantic Servants, and Yellow Diamond's attempts to destroy everything related to Pink Diamond and seeing Blue Diamond's feelings as useless, Blue Diamond didn't have the time or place to properly vent and grieve. Then comes Greg, a mere human who not only takes the time to listen to Blue Diamond's thoughts, but tries to comfort her instead of dismissing her feelings or forcing her to move on. Blue Diamond takes such a liking to him that she decides to take him with her to the Zoo so he'd be spared the destruction of the Earth by the Cluster, unaware it'd been neutralized by the Crystal Gems.
  • Beam Spam: Has the ability to manipulate energy, which includes making it rain energy beams.
  • Benevolent Boss: She comes off as one in "The Trial", as she summons her palanquin for Defense Zircon to use for her argument when the latter requests her to, and later steps in on her behalf when Yellow poofs her. In "Together Alone", it's revealed that she allows Blue Pearl to draw pictures, to the surprise of Yellow Pearl. "Change Your Mind" has her outright realize just how unfair her and the other Diamonds' treatment of their subjects is.
  • Berserk Button:
    • Don't interfere with her attempts to get to the bottom of how Pink Diamond was shattered, even if you're Yellow Diamond. Fortunately, her reaction to the truth is far more pleasant than one would expect.
    • Rose's sword, given her reaction at the trial, and once she actually sees it in "Reunited" she stops crying and goes into an earth-shaking rage before proceeding to break it like it was a toothpick.
  • Beware the Nice Ones: While outwardly more sympathetic than most Homeworld Gems, we're occasionally reminded that she's still very much not someone to be trifled with. In particular, she's so bent on revenge against Rose that she specifically wants to hear what Rose herself thinks her plan is, so she can do something worse.
    • When it comes to her official role as head of the Gem Empire's court system she is known as merciful. However, the way she dealt with Garnet first fusing, and in the movie the fact the major change she admitted to making for Steven by not shattering Gems, in the same way Yellow gave up leading her armies, implies she's more prone to executing others then her reputation would let on.
    • Also, despite being meek and/or demure around Yellow Diamond, when evidence starts cropping up that her fellow Diamonds might have been responsible for Pink Diamond's shattering, she actually starts shouting.
    • Seen again in "Reunited". She's a terrifyingly capable warrior, using her emotion-based powers to effortlessly incapacitate the entire Crystal Gem team. It was only Lapis Lazuli, whose extremely tragic past made her immune to Blue's grief wave, that allowed them to temporarily stun her. And even then, she was back up in seconds.
    • In "Change Your Mind", she even fights Yellow to protect Steven.
    • Her power of reverse empathy is also arguably the worst of all of the Diamonds. Yellow's electric abilities can "poof" gems instantly, but they seem to be unconscious while in that state, and just need time to reform their bodies. White's mind-control is also terrifying, but as Pink Pearl/Volleyball can attest, a Gem's actual persona is also unconscious in this time—once the control is over, they awaken as if they were sleeping, with no memory of what's been happening. But Blue? Blue forces other Gems to feel such horrible grief that they can't move...and are aware of it. They're conscious during every second of the attack, which can last as long as Blue wants, and can't even find solace in the fact that they'll eventually pass out from the pain.
  • Big Bad Duumvirate: Often serves in this role with Yellow Diamond. They even invade the Earth together. It's also shown that Blue, Yellow, Pink, and White are part of this as a Dysfunctional Family archetype.
  • Big Brother Bully: Gender-inverted and deconstructed. Her constant dismissal of Pink, combined with her refusal to let Pink spare the Earth, caused Pink to resent Blue and believe she never cared about her. In present day she seems to have realized this, as she blames herself for Pink's "death" and seems to have come to the conclusion that Pink was right about humanity not deserving to die. "Together Alone" has her angrily telling "Pink" to "quit fooling around". This reaches its ultimate conclusion when Steven angers her to the point where she physically assaults him, leaving Steven to ask Blue how many times she locked Pink away, hurt her, and made her cry. This forces Blue to confront the fact that it was her abuse that drove Pink away in the first place, and that her claims of loving her fellow Diamond rang hollow in the face of her actions.
  • Big Brother Instinct: Gender-inverted. In a flashback, Blue at least tries to thoroughly praise and encourage Pink Diamond in light of the rebellion, a stark contrast to Yellow refusing to speak and turning her back on the latter. It doesn't actually work because she misunderstood Pink's motivation and comes off as Condescending Compassion, but she gets points for trying, unlike Yellow, who was straight-out ignoring Pink. In "Familiar", Blue notes that she always loved Pink's cheerful personality.
  • Bitch in Sheep's Clothing: While not an unsympathetic character, Blue's role as the softer foil to Yellow can push her into this. Yellow's hostility is very visible and stated easily while Blue's isn't always evident but it's still there. Blue always comes across as the more empathetic of the two, but her Condescending Compassion and infantilization of Pink strike at a deeper level than Yellow's bluntness. It's especially apparent in scenes like when Steven meets her in the pool; Blue seems receptive at first but by the end of the conversation it's clear she doesn't "see" him as anything other than a facade Pink put on and when faced with Garnet she only acknowledges the Gems that make her rather than as her own person.
  • Blue Is Heroic: A downplayed inversion. Her only color is blue and her name is literally "Blue Diamond", but she's an Anti-Villain who, despite her unsavory traits, starts out as the most sympathetic of the Diamonds who eventually realizes the physical/emotional harm she had caused everyone and becomes genuinely good.
  • Broken Bird: This may overlap with Break the Haughty; while it's unknown how "evil" she was before Pink Diamond's shattering, it's clear that it left her in a state of depression that lasted for over 6,000 years, and even after learning the truth, has left her with emotional scars that aren't going to heal anytime soon.
    Blue Diamond: You cannot fathom how much I've mourned! What thousands of years of grief has done to me!
  • But for Me, It Was Tuesday: When Blue Diamond sees Sapphire and Ruby face to face, she doesn't even remember them as the Gems she was furious at centuries before, though this is understandable as the event in question was over five thousand years ago. She remembers who they are in "Reunited" once she sees Garnet.
  • The Chains of Commanding: If Yellow Diamond is telling the truth, Blue Diamond's deep and perpetual grief over the death of Pink Diamond may be causing her to neglect her duties as a leader of Homeworld.
    Yellow Diamond: Where's their Diamond when they need her, Blue? You've got to be a leader, Blue!
  • Character Development:
    • While it's left up in the air how much of it is due to grief, her modern appearance suggests she has changed a lot since the Rebellion and Pink Diamond's death. She's also far kinder and more considerate towards Steven than she was in flashbacks to Pink. However, once everyone returns to Homeworld after finding "Pink Diamond", Blue reverts to her old aloof, controlling behavior by expecting Steven to host a royal ball exactly to the Diamonds' standards, and when Steven breaks protocol by dancing and fusing with Connie into Stevonnie, Blue threatens to unfuse them herself. In "Change Your Mind", Blue briefly reaches her Rage Breaking Point and blasts Steven with an energy beam, before Steven's Armor-Piercing Question makes her realize what she's doing and transition into a full Heel–Face Turn.
    • As of The Movie and Future she's improved her attitude immensely, and is now actively seeking to bring happiness to other Gems. She's also become far more loving towards Spinel than she was towards Pink.
  • Co-Dragons: With Yellow towards White. They don't really enjoy it.
  • Cool Aunt: After realizing Steven is technically Pink, she becomes far kinder, more supportive, and considerate towards him than she was to Pink. Where Yellow still has some harshness towards him, Blue is quick to come to his defense and instantly jumps in to try and help heal Centipeetle — when Yellow near instantly writes it off as a lost cause — because it's important to "Pink". "Familiar" briefly has her calling him "Steven" instead of "Pink". And then there's her Heel–Face Turn in "Change Your Mind", which has her fully acknowledge him as his own being and she even fights Yellow to protect him.
  • Cool Big Sis: What she'd like to believe regarding Pink Diamond, but ultimately a subversion. While she was closer and more affectionate to Pink than the other Diamonds, and she did try to encourage her, it's revealed later that she had inadvertently emotionally abused her one time too many as well, by locking her up in a tower and later berating her when she made a mistake, ignoring her wish to preserve Earth's living inhabitants, and making her a Puppet Queen. It's also implied she may have used her emphatic abilities to make Pink cry too. This, along with Yellow's strictness all culminated Pink's belief that Blue and Yellow didn't truly love her and partially resulted in Pink rebelling against them as Rose Quartz. Blue redeems herself when she realizes how terrible she was to Pink, and resolves to help Steven and Connie escape Homeworld as atonement.
  • Costume Evolution: The Moon base mural depicts Blue Diamond with a bare head and darker colored hair. When Blue Diamond appears in "The Answer" and "Steven's Dream", she wears a dark blue cowl and has bluish-white hair.
  • Create Your Own Hero:
    • If she hadn’t been so quick to turn against Ruby and Sapphire for fusing into Garnet, it probably would have never resulted in the Crystal Gems and made Pink try to make Earth a home for dissatisfied and outcast Gems.
    • Her misguided harshness and controlling behavior towards Pink is part of what led to Pink becoming Rose Quartz in the first place.
  • Creepy Shadowed Undereyes: She has heavy shadows under her eyes that are a darker shade of blue than the rest of her face, ostensibly from grief over losing Pink Diamond. Note that, in the flashback in "Now We're Only Falling Apart" where we see her face, she didn't have these, only because Pink was still alive then.
  • Crippling Overspecialization: Her Emotion Bomb is so powerful that she seems to use it as a crutch in combat, to the point that she doesn't appear to know how to fight properly without it. It's telling that when Lapis shrugs it off her only backup plan is to bombard her opponent with magic until they poof.
  • Curse of Babel: She was able to temporarily restore Nephrite's speech, implying that this part of the corruption was her doing.
  • Curtains Match the Windows: Downplayed. Her hair is blue, but quite light when in comparison to her eyes.
  • Cute Giant: Particularly after discovering Pink Diamond was never shattered.
  • Dark Is Evil: Well, more of an Anti-Villain, really, but her overall dark color scheme and shadowed face match her occasional cruelty and indifference well enough.
  • Dark Is Not Evil: She becomes this after Steven reveals to her the truth of Pink Diamond’s whereabouts. By the time of "Change Your Mind", this becomes far more blatant, to the point she even admits regretting what she's put her own Gems through.
  • David Versus Goliath: What the fight between her and the Crystal Gems amounts to in "Reunited". Unfortunately for them, this Goliath is too damn hard to take down even with Lapis' help.
  • Death Glare: Gives two to Steven in the "Wanted" arc. Before that she gave one to Sapphire in "That Will Be All".
    Blue Diamond: I want to know what SHE thinks we're going to do with her. Because I want to do something worse.
    • Shows up again in "Reunited". As the Crystal Gems stand on the beach to fight her, she stares at them with murder in her eyes, and gives a big absolutely terrifying one to Connie when she attacks her with Rose's sword.
  • Did You Just Punch Out Cthulhu?: In "Change Your Mind", she slaps Yellow on the wrist, leading to an all-out fight between them.
  • Disproportionate Retribution: She threatened to smash Ruby's gem, for fusing with a courtly Gem like Sapphire and "letting the rebels escape". This can be overlooked to some degree in that Rubies are literally Red Shirts, and Ruby herself was confused over Sapphire's actions because Ruby knew she was expendable.
  • Dissonant Serenity: She's hardly fazed by Sapphire's announcement about an upcoming Rebellion attack, even when Sapphire details losses on Blue Diamond's side. Understandable in the fact that the Gems would've just been poofed, and Sapphire herself even says that she looks forward to seeing her again after she reforms.
  • Doting Parent: In a flashback on the Moon base in "Can't Go Back", she speaks to Pink Diamond about the latter's first colony in a stern, yet kind way. That said, Pink Diamond didn't see her that way and believed she and the others never cared at all about her. After she learns that Steven is Pink Diamond reincarnated, the first thing she's shown doing in "Legs From Here to Homeworld" is crying tears of joy while nuzzling Steven. Later on, Blue is quick to support his decision to try to uncorrupt Centipeetle and is willing to go to Homeworld to talk to White Diamond despite her fear of White. In "Change Your Mind", Yellow calls her out for constantly bending the rules for Pink.
  • Dramatically Missing the Point: The Human Zoo that was kept in Pink's name? That was created by Blue, because she misunderstood Pink's desire to preserve Earth. And she genuinely thought that her and Yellow's decision to make Pink a puppet ruler of Earth would help shield her fellow Diamond from the more difficult aspects of ruling, since she interpreted Pink's excuses as her having a hard time with colonizing Earth. It all backfired spectacularly.
  • The Dreaded: In "That Will Be All", Blue Diamond struck such fear in her former subject Sapphire that the latter literally started freezing up, and had to be placated by Ruby holding her hand in secret. "Steven's Dream" shows that even Garnet is terrified of her.
  • Due to the Dead: She secretly visits Earth to pay respects to Pink Diamond's "shattering" site behind Yellow Diamond's back, and knowing she'll disapprove. She also keeps a Shrine to the Fallen by bubbling Pink's Rose Quartzes and preserving her old Human Zoo and bed chambers. Yellow Diamond's efforts to Unperson Pink and destroy everything related to her, on the other hand, is at their core, someone desecrating a loved one's grave and memory for the sake of repressing her own pain and grief.

  • The Eeyore: Since her powers are based off of her sadness and crying in tears, it's safe to assume that she's this compared to the other Diamonds. Ever since Pink Diamond's shattering, she's been depressed and sad all the time — so much that she began neglecting her leadership duties. She smiles more often after discovering that Pink Diamond was never shattered.
  • Elderly Blue-Haired Lady: Is one of the oldest Gems in existence, and naturally has blue hair.
  • Emotion Bomb: She has the ability to project her own sadness onto other Gems, and it's potent enough to make every Gem within the area start crying at once and even fall to their knees.
    • We see the full, horrifying extent of this in "Reunited". In earlier episodes, her projection power seemed like something she couldn't control — it only popped up when she felt strong emotion. Then we see that she not only has complete control over it, she knows how to weaponize it. With a single raise of her hand, she immobilzes the whole Crystal Gem team. (Barring Connie and Lion, who, as a human and lion, aren't affected at all.)
    • As of Future she has discovered that this power works with other emotions as well, allowing her to conjure blue clouds that induce pure happiness in Gems who touch them.
  • Energy Weapon: Her primary attack in "Reunited" is to slow down the Crystal Gems with Emotion Bombs and summoning self-directing Hand Blasts to barrage the battlefield.
  • Even Evil Has Loved Ones: It's unclear how high she ranks on the "evil" scale in the present day, but she really seems to care about Yellow and Pink, comforting the former in "That Will Be All" and "The Trial" and having mourned the latter's supposed death for five thousand years.
  • Even Evil Has Standards:
    • In contrast to Yellow Diamond, who views organic life as something to be snuffed out, Blue Diamond takes a more paternalistic approach by keeping humans in a nature preserve in Pink Diamond's memory.
    • Despite demanding deference and respect from her subjects, even she doesn't seem to care for displays of excessive brown-nosing, albeit not to the same obvious extent as Yellow.
    • During "The Trial", she's very insistent on taking the proceedings seriously (as opposed to Yellow Diamond, who openly treats it as a show trial).
  • Excessive Mourning: Pink Diamond died over five thousand years ago. Blue Diamond still mourns her death as though it had happened yesterday. Justified, as she's lived for possibly eons, and five thousand years really is like yesterday for her.
  • Exotic Eye Designs: Like Yellow Diamond, she has diamond-shaped pupils.
  • Failed a Spot Check: Played for Drama. While helping to fight the rebellion on Earth, she never realized that Rose Quartz and Pink Diamond have distinctly the same voice. Even if you could excuse it as Pink changing her intonation dramatically, the real Rose Quartzes sound distinctly different from the Crystal Gems leader.
  • Fatal Flaw: Sloth. If Yellow Diamond's song is anything to go by, Blue Diamond is so overwhelmed with grief that she is living in the past and neglecting her duties as a leader.
    • This seems to be a subversion after "The Trial", where Blue isn't just grieving, she's unable to accept the official story of her beloved family member's demise — because it makes no sense. The questions "How could Rose do it?" and "How did Rose do it?" are tearing her up inside. This, coupled with the fact that Yellow is uninterested in finding the truth, is causing her even more distress. A real-world equivalent would be a grieving person whose family member was murdered but they never located their family member's dead body. Little wonder Blue is unable to move on.
  • Five Stages of Grief:
    • When she's first introduced, she's very clearly in the Depression stage and has been for quite some time, having not stopped crying in over several thousand years. She also regularly travels to Earth to visit Pink's shattering sight, despite knowing full well that the planet, and everything on it (including herself) could be destroyed at any second by the Cluster forming, and is in no hurry to leave when told this by her Pearl. This implies she may even have self-destructive desires or just doesn't care about her well being anymore.
    • To a lesser extent, she's also stuck at Bargaining, as she hoards anything and everything that belonged to Pink Diamond. It's a major reason she brought Greg (a native to Pink's "home planet" Earth) to the Zoo, as well as why she keeps all of Pink's Rose Quartzes bubbled instead of shattering them. It's also why she decides to go with court formalities in "The Trial", because she wants to know the truth behind Pink's "death".
      • "Change Your Mind" shows this may have also been fueled by Denial as well, as collecting life forms for Pink was apparently something Blue did frequently before Pink was "shattered".
    • Steven escaping the trial and Homeworld thrust her fully into Anger during "Reunited", with Blue actively going into combat before Yellow, and weaponizing her emotional powers. Seeing Rose's sword even triggers her to earthshaking shouting and attempting to hurt the Crystal Gems to make herself feel better, which she admits only makes things worse.
    • In the Diamond Days arc, she seems to have replaced her earlier seen deep Depression with heavy Denial. With Steven having revealed himself as Pink's son, Blue becomes eager to return Homeworld to an idealized version of its Era 1 stages when the Diamond Authority was whole and happy, and keeps calling Steven by his mother's name despite assertions that he's not Pink in an organic form. However, when "Pink" continuously breaks the rules and tells Blue to her face just how terrible things are on Homeworld, she can't keep her delusion from falling apart and eventually relapses into Anger, which worsens to the point she emotionally snaps and physically assaults Steven.
    • In "Change Your Mind", after Steven calls Blue out on how her and the other Diamonds treated Pink with emotional and physical abuse, she has a Heel Realization that allows her to finally move into the Acceptance stage, not only accepting Steven as his own individual apart from Pink (who is very much gone for good), but also accepting a slew of other issues she had been to afraid to admit, including; how Pink was right to leave and didn't belong on Homeworld any more than Steven does now, how dysfunctional the relationship between all four of the Diamonds is, how White Diamond's screwed up rules and standards on Homeworld are what is truly making her (and everyone else on the planet) miserable, and just how miserable she, herself, truly feels. After admitting all of this Blue becomes much more pro-active in helping Steven and trying to fix things and attempt to finally move forward.
  • Foil: To her fellow Diamond, Yellow. Aside from their colors and masculine/feminine personalities, Blue Diamond constantly and obsessively mourns Pink Diamond, collecting everything related to her to preserve Pink's memory, and is so utterly consumed by her own depression that she neglects her duties as ruler of Homeworld.
  • Foolish Sibling, Responsible Sibling:
    • Yellow and Blue (responsible) and Pink (foolish). After Pink's Heel–Face Turn, the roles are reversed.
    • This trope is Zig-Zagged between her and Yellow in the present day during Steven's trial. While Blue does act depressed and unable to function in her normal daily life, at the very least she's insistent on continuing the trial properly. Yellow, on the other hand, while determined to keep her forces in line, treats the trial like a Kangaroo Court.
  • Forehead of Doom: She has a very tall forehead which adds to her perpetually droopy face.
  • For Your Own Good: When Pink was reluctant to continue with the Earth colony, she and Yellow directly intervened. She was quite vocal about it, wanting her younger fellow Diamond to be as successful as them.
  • Gasp!: Blue Diamond reacts this way after Blue Zircon implies one of the Diamonds shattered Pink, either for the shock of such sacrilegious declaration, or because it actually makes sense (Blue Diamond trying to calm Yellow Diamond makes the latter a likely situation). She also gives one of these in "Reunited", when she realizes that Steven really is the supposedly-shattered Pink Diamond.
  • Gentle Giant: She already shows shades of this in "Steven's Dream" with the kindness she displays towards Greg, but she doesn't truly fulfill this trope until her Heel–Face Turn.
  • God Save Us from the Queen!: Very queenly (Greg even calls her "Your Highness"), and also very tyrannical. Does not hesitate to order Ruby executed for breaking a taboo, even accidentally while trying to do her job. She may have lightened up in the present day, though how much remains to be seen.
  • Hair-Trigger Temper: Ironically, Blue Diamond's temper can be even worse than Yellow Diamond's. It took one of her followers calling her what is probably the equivalent of a Gem slur, and in another case, being accused of murdering her own family member, for Yellow to finally snap and get violent. Blue, on the other hand, was immediately ready to shatter one of her own Gems for accidentally fusing with one of her elites, and totally lost her composure because "Rose Quartz" apparently didn't want to remember the most traumatic event in her life. As mentioned above in Axe-Crazy, it's unclear if her violent anger is as a result of Pink Diamond's supposed shattering. "Now We're Only Falling Apart" implies that she was like this beforehand considering how Pink Diamond express fear and guilt for leaving Garnet at her mercy, which makes her change her goal from scaring Homeworld off of Earth to making it a home for outcast Gems.
  • Hartman Hips: The cinch at her waist gives her a set of these, most noticeable during "Together Alone" when she sashays side-to-side as she enters the ballroom.
  • Heart Is an Awesome Power: A dark example. Yellow has electricity-based powers which can effortlessly "poof" a Gem, taking them out of commission. Compared to this, Blue's Emotion Bomb gift of spreading her feelings to other Gems seems weak... Then "Reunited" aired, and we see that she can easily weaponize that reverse empathy to completely incapacitate every Gem in range. Her power is so strong that it unfuses Alexandrite within seconds.
  • Heavenly Blue: She is, as her name implies, blue, resembles the Virgin Mary, has blue light attacks and is worshipped as a god. She is, however, an antagonist. For most of the series, anyway.
  • Heel–Face Turn: Her love for Pink, and by extension Steven, eventually win out over her fear of White and her own lingering bitterness. She betrays White and fights Yellow to save the Crystal Gems and Steven, and openly admits what she's done to her own subjects was wrong.
  • Heel Realization:
    • Has had a partial one. Unlike Yellow, she's realized humanity doesn't deserve to die and has come to respect them. However, she's unable, or unwilling, to go against Yellow and do more than spare a few of them.
    • Unlike Yellow, she seems to have realized she and Yellow were too callous and cruel to Pink, to the point of blaming herself for her apparent demise. When she realized Steven is Pink (in a sense), she stops her rampage and shows she really has changed, being far kinder and more considerate to him and what he wants. Though this also turns out to be downplayed in that it's clear she hasn't fully learned from her mistakes, and is still prejudiced towards humans and the Crystal Gems.
    • Finally has a full one that leads to a Heel–Face Turn when she hurts "Pink" yet again and Steven calls her out on it, with his words making her realize that doing this so many times drove Pink away in the first place. Blue outright admits that Pink was right to leave, and that Homeworld was failing Pink if she was happier on Earth than she was there.
    • She lets out during her confrontation with Yellow that she's realized the Gems under them have been suffering and seems to finally understand how immoral it is, but was burying it to live up to White's standards. This makes her sparing the Earth Quartz Gems, treating her Pearl well, and being furious at the trial when Yellow needlessly poofed the Zircons take on a completely different meaning.
  • Hidden Eyes: Seems to be a theme with her, as her Pearl, Sapphire, and Blue Diamond herself all cover their eyes.
  • Hidden Depths:
    • "Now We're Only Falling Apart" reveals Blue created the human zoo as an attempt to compromise with Pink Diamond’s begging to cease the colonizing of the Earth. Very surprising considering she was as dismissive of organics like Yellow Diamond yet she was able to make sure future generations of Zoomans wouldn’t understand feelings like sadness and pain.
    • A darker example in "Reunited". Previously, she had raised her voice on the show twice, both in "That Will Be All" and "The Trial", and she seemed almost weak compared to the war-like Yellow. Then we see her battling in action, and... let's just say it's not pretty.
      • The same episode demonstrates that she understands just how useless continuing the war with the Crystal Gems is, since no matter how much they suffer it can't bring Pink Diamond back.
    • She treats her Pearl well, spared the Earth Quartz Gems, and is enraged when Yellow needlessly poofs the Zircons. As it turns out and she admits to Yellow, she's realized their Gems are suffering needlessly and does feel bad about it, but is too afraid of disappointing and enraging White to act on it.
    • Out of all the Diamonds, she may actually be The Smart Guy when she allows herself to think independently, outside of White's ideals and standards, as she uses her status as the head of Homeworld's judicial system to create a socially acceptable way for Blue Pearl to indulge in her drawing hobby despite it being outside Homeworld norms, recognizes the logical inconsistencies in the testimony regarding Pink's "shattering" and, at the end of "Change Your Mind", she suggests using Rose's tears as a medium to channel the Diamond Authority's powers into the corrupted Gems.
  • Hypocrite:
    • In a flashback in "Now We're Only Falling Apart", Pink Diamond is shown to be worried that Blue will reprimand her for visiting the Prime Kindergarten, but in "Steven's Dream", Blue herself is shown going against Yellow's orders and visiting the Earth against her wishes.
    • Also, in "Can't Go Back", Blue had the nerve to call Pink out on not finishing her duties as a Diamond and accuse her of being ungrateful, when, after Pink's demise, she spent millennia grieving instead of being a Diamond. And back when Pink was still alive, she did everything she could to fix the Diamonds' dysfunctional relationship, only for Blue to pay her back with locking her up whenever she stepped out of line and making her cry, even taking away Pink's first colony when she wouldn't complete it. Yellow calls her out on the former and Steven calls her out on the latter.

  • Icy Blue Eyes: She has droopy, light blue eyes, which can appear innocent when she grieves.
  • Implacable Man: In "Reunited", even with the combined efforts of the Crystal Gems (including Connie, Bismuth, Peridot and Lapis, who has the entire ocean as her weapon) all attacking Blue Diamond at once, all they manage to do is slow her down and knock her off her feet, Blue Diamond easily breaking any hold they have on her and shrugging off every attack, including Lapis dropping the barn on her and the Cluster slamming Yellow's ship onto her ship ONTO HER! And that was before Yellow Diamond joins in...
  • I Never Said It Was Poison: Subverted, as she's definitely not the murderer of her beloved Pink Diamond. She does, however, correct Steven, who had become convinced his mother eventually used Bismuth's Breaking Point weapon to kill her own Diamond. Blue screamed it was a sword. Bismuth designed Rose's sword to slice through physical forms, but never shatter the gem itself.
  • Innocently Insensitive: Where to begin; she responded to Pink's desire to spare Earth by giving her a People Zoo, she apologized to Steven for making him spend "6,000 years on this horrible planet", and she's generally incapable of reading a room.
  • Improbable Hairstyle: A large part of her hair comes out of her head and goes back in, forming a seamless loop. It's the clearest demonstration that Gems' hair is formed whole, not grown.
  • In the Hood: She wears a long blue cloak that does a good job of obscuring her eyes. It gives her a likeness to the Virgin Mary when she stands.
  • Ironic Name: Blue diamonds represent peace, spirituality, and good health, which is ironic, given that her lasting grief and mourning over Pink is far from an improvement to her well-being.
  • Irony: Blue, the one who seemed most interested in reconnecting with the other Diamonds, is the one who can't bear to even look at an off-colored (read: blushing) White; she even looks like she's going to vomit.
  • It's All About Me:
    • Grieving has made Blue increasingly self-centered, causing her to push away her responsibilities to the Gems who follow her and reject Yellow's attempts to help her. Yet this selfishness comes with minimal self-reflection, as it's clear she's putting the burden of Pink's demise on everyone but herself.
    • In general, her role as The Empath is this since she uses it to force others to feel her pain while showing a complete Lack of Empathy for the pain of every other non-Diamond living being in existence. When she attacks the Crystal Gems, she tells them she wants to make them feel the pain she'd been feeling since Pink died, as if they hadn't collectively felt that pain and more.
  • It's All My Fault: She blames herself for not preventing Pink Diamond's shattering at the hands of Rose, a sentiment that she privately expresses to Pink Diamond's ruined palanquin while visiting Earth in "Steven's Dream". "Can't Go Back" reveals she pressured Pink Diamond into continuing the war for Earth even though Pink wanted to just leave Earth and the Crystal Gems alone, explaining why she feels that way.
  • Karmic Jackpot: Her pulling a Heel–Face Turn, realizing the error of the Diamonds' tyrannical ways, and attempting to help Steven and Connie return to Earth result in her finally being free from her status as one of Homeworld's rulers and reconciling with the other Diamonds.
  • Kick the Dog:
    • In Ruby and Sapphire's love story, she threatens to have Ruby shattered for something that was an obvious accident.
    • She just laughs at Garnet for the latter being a cross-Gem Fusion.
  • Kick the Morality Pet:
    • She and Yellow Diamond perform a dual one in a flashback in "Now We're Only Falling Apart", in which they reject Pink's offer to spare the Earth.
    • She also shoots Steven with an energy ball when "Pink" defies her one time too many. It's heavily implied she's done this before, and Steven lampshading this prompts her Heel Realization.
  • Know When to Fold 'Em: In "The Answer", she knows her limits and tries to escape the rebels on her palanquin.
  • Lack of Empathy: A variant; of the Diamonds, she does have empathy, and her emotional side was brought out after Pink Diamond was shattered. However, she's still a Bad Boss to her Gem subjects, and while she's a sympathetic character, she represents the negative side-effects of grieving in that she refuses to move on and accept help from those who genuinely care for her, preferring to shift responsibility and blame onto others while leaving herself stuck in a constant, self-defeating cycle. This is represented by her Emotion Bomb powers, which makes everyone in the vicinity suffer, while never acknowledging or accepting that she's part of the problem herself. Subverted when it turns out that she not only has enough empathy of her own to realize why Pink left Homeworld, but understand that the Homeworld Gems are suffering under Homeworld's ways as well.
  • Lady of Black Magic: Her regal robes and hood invoke a resemblance to a classical witch, and she primarily uses magic in combat either in the form of her depressive aura or energy blasts.
  • Large and in Charge: She's only slightly shorter than Yellow, as seen when the two stand side by side in the fourth and fifth seasons. The height difference is probably because Yellow wears heeled boots.
  • Laser-Guided Karma: Because Blue was emotionally abusive and condescending towards Pink, the latter stages a rebellion against Homeworld and faking her death, causing Blue to grieve for millennia. Following the return of Pink's son Steven to Homeworld, Blue, seeing him as Pink, becomes eager to renew her familial bond with him only to revert back to her aloof behavior towards him, but it doesn't take long for him to (in Blue's view, anyway) turn out to be even worse than Pink, much to Blue's distress. It only takes Steven convincing her that her behavior was wrong for her to finally realize the flaws of Homeworld and the Diamonds — the kicker is since Pink Diamond is truly dead, she can never personally apologize to her littlest fellow Diamond for what she had done.
  • Lean and Mean: In her initial appearance, she is veiled, ambiguously threatening with long, lean arms, and is perfectly willing to crush Ruby's gem more for accidentally fusing with Sapphire than allowing the rebels to escape. In the present, this is subverted as she is more traditionally feminine-looking than her fellow Diamond Yellow with a fuller, more hourglass shape. Whether this is due to Garnet being an Unreliable Narrator in "The Answer" or due to a regeneration in the intervening millennia is yet to be known. After experiencing a Heel Realization, she decides to avert it and help Steven and Connie get to White Diamond.
  • Leitmotif: Her specific variation of the Diamonds' theme, heard during her meeting with Greg, incorporates a twinkling chiptune not dissimilar to Lapis' celesta.
  • Light 'em Up: In her battle with the Crystal Gems she throws beams of blue devil light.
  • A Lighter Shade of Black: As opposed to wanting to destroy Earth for the sake of Revenge (like Yellow Diamond), Blue Diamond wishes Earth wouldn't die (as it's one of the last remnants of Pink Diamond). In fact, she and the human Greg have a moment based around both losing loved ones. She still basically kidnapped him, but it was for more sympathetic reasons than spite. This is on top of her developing a respect for humanity for persevering through life despite, in her eyes, being weak. Her actions in "The Trial" only lighten her further, as she's a Reasonable Authority Figure compared to Yellow, adamantly refusing to cut straight to an execution without going through due process, and giving Steven and his defense lawyer adequate time to speak and defend themselves, even allowing Blue Zircon to present her personal Diamond palanquin as evidence. While she doesn't stop Yellow from poofing both Zircons, she IS furious that Yellow did so in the first place and lets her know it.
  • Light Is Not Good: Her palanquin, hooded veil and flowing robes offset give her an eerily saintlike appearance. As the rest of these tropes will tell you, she's anything but — or, at least, she was back during the Rebellion. As the A Lighter Shade of Black entry explains, she's certainly a little better than Yellow Diamond these days. That said, she's the first of the Diamonds to side with Steven over White, and openly admits that what she's done to her Gems in White's name was wrong. She also fights Yellow as a result.
  • Locked Out of the Loop: As "The Trial" reveals, she's (almost) completely in the dark about what really happened with Pink Diamond's death.
  • Long Hair Is Feminine: The Moon base mural depicts her with long black hair, and in the present day her hair is long, flowing, and pale with a "loop" that wraps around her gem.
  • Love Redeems: In "Change Your Mind", after Blue realizes how unhappy Pink was on Homeworld, due to how emotionally abusive the other Diamonds were to her, Blue herself included, she decides to help Steven and Connie escape Homeworld, fights off Yellow to protect Steven, and along with Yellow, tries to convince White that everything they're doing is wrong and it's tearing their family apart.

  • Mama Bear:
    • It's heavily implied that she and Pink Diamond were very close, and her shattering affected her greatly. Her behavior in "The Trial" is akin to an angry, grieving parent searching for answers and confronting the (supposed) killer of their child on why they did it. In "Reunited", she takes a personal fight to the Crystal Gems, and very nearly defeats them in a matter of seconds, all because she despises the fact they're sullying Pink's former planet with their presence.
    • Her fight with Yellow is dripping with this, as she's fighting to protect Steven from Yellow.
  • Maternally Challenged: Tries very hard to be a Cool Big Sis to Pink, and a Cool Aunt to Steven, but her consistent Lack of Empathy means that every time she interacts with them, she ends up hurting them in some way.
  • Meaningful Name:
    • The Hope Diamond, the world's most famous diamond, is a blue diamond. Blue Diamond seems to be the direct leader of the nobility. The Hope Diamond is also believed to be cursed and bring misfortune to anyone who tries to wear it, which is fitting given Blue Diamond being very quick to shatter Ruby, and the fact Lapis (who wears Blue Diamond's symbol) has been hit with the most misfortune of any other being, Gem or human. Blue Diamond herself also suffered the loss of a loved one and has spent much time in constant mourning and heartache. She also has the ability to inflict sadness and sorrow on others.
    • When we finally see her again, she's in mourning, and is implied to have been so for the past few thousand years. Yellow Diamond's Villain Song "What's the Use of Feeling (Blue)?" mixes it with Punny Name; it's like being called "Sad Diamond".
  • Messy Hair: In "Change Your Mind", after Steven gets through with her about her behavior towards Pink, Blue's perfectly groomed hair starts becoming more unkempt as she finally realizes the scope of her actions. It shows how her "Diamond" persona is breaking, allowing her to truly gain human empathy.
  • Mood-Swinger:
    • She suddenly snaps out of mourning when she's suspicious of Sapphire's (false) claim to have been on a special mission for her. Then Sapphire explains she was taking an opportunity before Earth was destroyed, and Blue Diamond instantly snaps back to looking miserable.
    • In "The Trial", she starts out calm but when she questions "Rose" who lies to her about how Pink was shattered, Blue is enraged for a second before grief and frustration overwhelm her, and she breaks down for a moment.
  • Moral Myopia: Blue Diamond had no moral qualms about ordering Ruby's execution, suggesting that she has a harsh standard for Gems that disobey her rules. However, when her fellow Diamond Pink was killed, she mourned for centuries.
  • My Greatest Failure: She and Yellow were tired of Pink's excuses in not completing the Earth colony, reassuring her Rose could do nothing against her, and instructing her to quash the rebellion. Shortly afterwards, news reached her that Pink was shattered by Rose. Her current behavior implies she is also aware her own callousness towards Pink may have contributed to what happened and regrets it. Confirmed in "Change Your Mind", as Steven throws her horrible behavior back in her face.
  • My God, What Have I Done?: Steven questions how many times she'd hurt Pink and made her cry, Blue replies she never did... then it slowly dawns on her how many times she actually did, and she's essentially trapped herself in a cycle of hurting Pink. And is doing so again that very moment. This realization finally cements her Heel Realization, making her realize exactly why Pink decided to abandon Homeworld to live on Earth as Rose.
  • Mystical White Hair: Has long white hair. Her mural, however, depicted her with black hair.
  • Never My Fault: In "The Answer", she blames Ruby for not stopping Rose and Pearl when Sapphire predicted it, even though she never did a thing to stop them herself.
  • Nice, Mean, and In-Between: Yellow (mean) is a short-tempered Bad Boss, Blue (in-between), while initially as bad as Yellow, seems to have Took a Level in Kindness in recent years thanks to Pink Diamond's "death", and Pink (nice) is an All-Loving Hero and a Benevolent Boss who cherishes and wishes to protect organic life.
  • Nice to the Waiter: Considerably less so than Pink Diamond, but she does thank her subjects whenever they do as she says or perform something that pleases her. She even outright defends the defending Zircon, even after she accused her and Yellow Diamond of shattering Pink Diamond.
    Holly Blue Agate: And surely, Blue Diamond would want to thank you personally for this special delivery, your Grand Clarity.
    Sapphire: Yes, I suppose she will.
  • Nigh-Invulnerability: On par with Yellow Diamond. She endured having a barn dropped on her, being attacked by all of the Crystal Gems, and being crushed by her own ship! When she gets back up, the only visible damage is her hair being slightly displaced. In "Change Your Mind", she resisted several seconds of sustained assault from Yellow Diamond's electrical attack and stood up not long after. The same electrical attack which instantly poofs other Gems after a quick blast.
  • Noble Demon: She wants to save at least some humans to honor Pink's memory, and she's an impartial and fair judge (of Steven, who we must remind you she thinks murdered Pink).
  • Non-Standard Character Design: Her appearance (particularly her long face and droopy eyes) borrows heavily from the style of Leiji Matsumoto to give her "a strange presence".
  • Not Afraid to Die: She sometimes visits Pink Diamond's grave on Earth even though, as far as she knows, the Cluster could become active at any moment and wipe out the planet and everything on it, herself included.
  • Not So Different:
    • Greg saw Blue Diamond's loss of Pink Diamond as no different than his loss of Rose. Their experiences with the death of a loved one allowed both of them to bond; what's more, Blue kneels down to look at Greg at eye-level more or less as this happens, which is in its own way acknowledging this trope.
    • She's also this to Pearl (at the beginning of the series): both are trying to cope with the death of their loved one in the same way, by constantly grieving and refusing to move on.
      • Ironically, Greg's, Pearl's and Blue Diamond's loved ones are all the same individual.
    • To Amethyst (post-Gem War). Both are considered the lazy, undisciplined members of their team, lacking proper motivation to work with others due to unresolved emotional growth (Amethyst's inferiority complex being an Earth-born gem and defective, Blue Diamond believing Pink Diamond had died in what may have been a preventable tragedy) and have developed counter-dependent attitudes towards anyone that pushes them over it (Pearl/Yellow).
  • Oh, Crap!: Twice in "Legs From Here to Homeworld". Once she learns of what the Diamonds' combined attack had actually done to all the Gems on Earth, she reacts in disbelief and horror. She's also terrified of incurring White's wrath over the senseless destruction she and the other Diamonds had caused because they all couldn't agree on Earth's colonization, behaving like a child who just realized they had utterly screwed up in a huge way.
  • Only Sane Woman:
    • Despite her grief, Blue seems to be the only Gem to have noticed that the initial stories about Pink's death didn't make any sense. Whereas Yellow is adamant Rose was responsible, going increasingly off the rails trying to shut down any line of inquiry, Blue is determined to find out the truth behind Pink Diamond's demise through using her official status as head of Homeworld's judicial system. As soon as the opportunity comes along she holds a trial and uses court procedures to gather additional testimony and evidence that explains the illogical aspects of Pink's shattering. This method leads to the Defense Zircon putting it together that the stories don't make sense because Rose couldn't have possibly shattered Pink, and puts Steven on the path to finding out the entire truth.
    • She's the first of the Diamonds who realizes the error of Homeworld's ways (aside from Pink), as well as the fact that she and the other Diamonds' treatment of Pink was wrong and outright abusive. She is also the one who personally tells White Diamond that they repaid Pink with neglect despite her desire for them to be happy, and how none of the Diamonds are actually happy with being tyrants.
  • Ooh, Me Accent's Slipping: Occasionally betrays hints of her voice actor Lisa Hannigan's Irish accent during her first appearances. From "Can't Go Back" onward, she speaks entirely with one.

  • Parental Substitute: One possible interpretation of her relationship with Pink Diamond. Since someone had to teach Pink how to behave like a Diamond with White withdrawn into solitude in her own headship and Yellow burying herself in her work most of the time in a vain attempt to impress White, the role was left largely to Blue. This makes Blue's grieving even more tragic.
  • Parting Words Regret: Implied. The flashback in "Can't Go Back" is implied to be the last conversation she had with Pink before the latter's faked assassination. What she says to her pretty much reads as "stop whining and be a good little Puppet Queen", and she encourages Pink to dismiss Rose Quartz as a threat. No wonder she's so broken up about Pink's passing. In particular, her final sentence was "As long as you are there to rule, this colony will be completed." Ironically, Pink Diamond didn't want the colony to be completed, and took Blue Diamond's words to mean that the only way that Earth could survive was if she removed herself from the equation.
  • Perpetual Frowner: Her eyes are constantly drooped, and she's barely ever seen not crying.
  • Personality Powers: Blue's Signature Move is a blue aura that forces the Gems around her to feel her despair and depression against their will, a reflection on how she only thinks about herself and her own feelings and forces others to bear her burdens for her. Between her Heel–Face Turn in "Change Your Mind" and "Homeworld Bound", she eventually learned how to create clouds that induce happiness and contentment in any Gem who touches them, an ability that helps the troubled minds of others instead of hurting them.
  • Pet the Dog: Like Yellow Diamond, she has quite a few.
    • In a flashback in which she is otherwise depicted as extremely cruel, she thanks Sapphire for predicting that Rose and Pearl will be defeated.
    • She is perhaps the first Homeworld Gem to quickly realize that humans are capable of empathy and feeling loss, and she lifts her veil and lowers herself to Greg's eye level to speak with him as an equal. Her abduction of Greg is because she thinks he doesn't deserve to die; at the time she did not know the Cluster was no longer going to destroy the Earth.
    • Her desire to preserve Pink Diamond's legacy includes keeping the humans in the Zoo well cared for and keeping the Earth Quartzes and other Rose Quartzes alive (even if the latter are bubbled), both of which Yellow Diamond finds absurd. She also intended to save Greg by kidnapping him and taking him to the Zoo.
    • She keeps the trial going, wanting to hear Steven and his defense Zircon out, and won't execute Steven outright when he demands to be punished for Rose's crimes.
    • When Yellow Diamond starts going ballistic on the Zircons when the Defense one implies that the Diamonds shattered Pink, Blue steps in on their behalf.
    • In spite of harshly scolding Pink Diamond for her supposed ungratefulness in a flashback in "Can't Go Back", she comforts her after seeing that her tone has upset Pink. Unfortunately, Pink didn't see this as a Pet the Dog moment, instead as a Kick the Morality Pet moment.
    • Despite taking a no-nonsense approach while facing the Crystal Gems, she ceases her hostility after she finds out that Rose/Steven is Pink Diamond.
    • She does genuinely care when she attempts to restore Nephrite.
    • Upon discovering her Pearl had an interest in art, rather than crushing this hobby outside her duties like most Gems would, Blue found a socially acceptable way for her to indulge it by making her the artist for Homeworld's trials.
    • Even before her Heel–Face Turn in "Change Your Mind", she seems genuinely concerned when telling Steven that Pink's time on Earth has warped her sense of right and wrong.
  • The Pirates Who Don't Do Anything: Pink's death has sapped all of her willpower to engage in Diamond duties anymore.
  • Power Incontinence: Blue's Emotion Bomb powers cause any Gems around her to cry her tears, but she can't seem to turn it off. If she has even so much as tears of joy, any Gems around her will be left in various stages between weeping and uncontrollably bawling. This even extends to Pink and Yellow Diamond, to the latter's annoyance. The movie reveals that she's finally gained control over her powers, however.
  • Prone to Tears: Blue Diamond is quite emotionally unstable, unintentionally harmful to those she loves (mainly Yellow Diamond), and extremely self-observed. Grieving certainly only highlighted these features in her, and at this point, the only Gem who could've opened her eyes to it (Yellow) doesn't do so because she's afraid of breaking Blue even further.
  • Pronoun Trouble: In "Change Your Mind", she agrees to call Steven by his name, but still refers to him as "she". Though, this may be to the fact that Gems all have female forms and thus might not even be aware of masculine pronouns.
  • Pushover Parents: Downplayed. Her younger fellow Diamond Pink was able to invent excuses for Blue to let her out of the prison tower, and Blue would cave and let her out. In "Change Your Mind", Yellow calls her out for constantly bending the rules for Pink.
  • Rage Breaking Point: "Pink"/Steven defying her one time too many leads to her attacking him. However, it works against her.
  • Reasonable Authority Figure: Well, when compared to Yellow Diamond today, though she was just as bad around Ruby and Sapphire's time. In "The Trial", she opts to go through "Rose Quartz's" (actually Steven) trial and hear out the defendant rather than going through with Yellow Diamond's wish of a quick execution. When Yellow Diamond goes ballistic from being accused of regicide, Blue Diamond tries to get her to calm down.
  • Red Oni, Blue Oni:
    • Like their respective Pearls, Blue is the... blue to Yellow's red.
    • Both she and Yellow serve as the blue to Pink's red, as they are more serious and less excitable than she is.
  • Revenge Before Reason: Subverted. We're led to believe that she wants to avenge Pink in "The Trial", given she wants to do something terrible to Rose. It turns out, however, that Blue wants answers more than revenge: how did her family member die, and why is the official story full of holes?
  • Rule of Symbolism: White Diamond summarizes her personality towards her relationship to the light spectrum.
    White Diamond: Ah, and Blue, her impurities soak up all the warmth in her spectrum. She thinks she needs you, Pink.
  • Sadist: During "The Trial", Yellow wants to kill Steven in a quick and probably painless way, while Blue implies she wants to torture him. Also, in "Reunited", it's actually subverted. When Steven enters the Diamonds's minds, Yellow is only thinking about Pink. Blue mentions how tormenting the Crystal Gems isn't bringing her any satisfaction, and only makes her miss Pink even more.
  • Screw This, I'm Outta Here!: In "The Answer", she flees in her palanquin when Rose and Pearl show up, rather than confront them directly.
  • Self-Serving Memory: She tells Greg that she and Pink Diamond were "very close", yet Blue's constant dismissal of Pink, combined with her refusal to let Pink spare the Earth, suggests that their relationship was strained at best. In fact, the only on-screen interactions between Blue and Pink when the latter was still alive have been fairly negative. "Now We're Only Falling Apart" even has Pink, as Rose, regretting leaving Garnet with Blue, implying that she sees Blue as more of a tyrant than a family member. It apparently got so bad that even thousands of years after faking her death, Pink didn't miss Blue at all.
  • Shadow Archetype: To Lapis and Sapphire, who were both once part of her court.
    • Blue, like Sapphire, was close to a red gem (Pink, Ruby), though Blue and Pink are implied to not have been as close as Blue thought. Unlike Sapphire, who had friends make her see her mistakes, Blue let her position's expectations and her own arrogance influence her relationship with Pink, which both alienated her and drove her away to the point of rebelling in the form of the commander of an intergalactic war. By the time Blue realized her mistake, Pink has faked her death, and Blue wasn't the same since.
    • Blue, like Lapis, endured an equal amount of psychological trauma, which continued to affect them for thousands of years. Unlike Lapis, Blue hasn't made an effort to try move on from Pink's death, something that Yellow Diamond called her out on in "That Will Be All".
  • Shout-Out: Her character design is a nod to many of the willowy female characters from Leiji Matsumoto's works.
  • Silk Hiding Steel: Most of the time, Blue Diamond is a graceful and demure presence, and seems to defer to Yellow Diamond's more authoritative presence. However, it's hinted that she's got a firmer side to her, as seen by her quiet suspicion of Sapphire's presence in the Zoo at first. Then, in "The Trial", we see her suddenly standing up to Yellow and engaging her in a shouting match. And in "Reunited", the steel comes fully out as even when her "reverse empathy" power is stopped, she's still an incredibly powerful warrior who can summon weaponized beams of light and shrug off her own ship slamming into her like it's nothing. Further, in the movie, the improvement to herself that she proudly tells Steven about is that she is no longer shattering other Gems. This, along with her experience with Garnet, implies that despite being known as the most diplomatic and merciful, execution was a main go-to when judging them.
  • Soft-Spoken Sadist: She talks in an almost soothing manner, but is also indifferent to her followers at best. Yellow's electric energy attacks "poof" Gems instantly, but Blue's ability—forcing any Gem to become overwhelmed with grief and suffering — keeps them fully conscious and aware of every second of the pain. When she uses that very power to incapacitate the Crystal Gems in "Reunited", she softly but intensely says one line: "You deserve this." Ultimately subverted, however, as when Steven sees into her mind, she admits it doesn't make her feel any better at all. If anything it makes her feel worse.
  • Someone to Remember Him By: A non-child example. Not knowing that the Cluster isn't going to destroy Earth, she kidnaps Greg as a memento of Pink Diamond.
  • Status Ailment: Her Emotion Bombs act as this in a battle situation, overwhelming every gem on the beach with overwhelming sadness and defusing Alexandrite in "Reunited".
  • Suddenly SHOUTING!: "IT WAS A SWORD!" It also applies to when Yellow Diamond starts poofing the Zircons — cue the soft-spoken Blue suddenly jumping forward to grab Yellow and shouting at her to get a hold of herself, and when she comes face-to-face with Rose's sword in "Reunited".

  • Tareme Eyes: Blue Diamond has large, sad, downward-slanting eyes which fits with her perpetual mourning.
  • Tears of Joy: She cries these in "Legs From Here to Homeworld" over sheer joy at seeing Pink (as Steven) again. She does it again later when they board Pink's ship together.
  • This Cannot Be!:
    • A rare not-entirely-evil example. At the end of "Reunited", Steven finally manages to send a psychic message that he has Pink Diamond's Gem. Blue's response? A soft "Impossible..."
    • Also in the same episode was surprise that Lapis Lazuli appears out of nowhere and declared herself a Crystal gem but also that she had resisted her emotion powers suggesting this has never happened before or that it's a rare event.
  • This Is Unforgivable!:
    • Her reaction to Ruby accidentally fusing with Sapphire is threatening to shatter Ruby's gem in "The Answer".
    • In "Reunited", she tries to murder all of the Crystal Gems for daring to thrive on the planet that belongs to Pink.
    • In "Together Alone", she is enraged at Steven when he accidentally fuses with Connie at the Era 3 ball.
  • Token Good Teammate: While Pink is definitely less ruthless than her, Blue appears to be this out of the remaining three Diamonds, at least, being considerably more mellow and down-to-Earth than Yellow and White. In addition, she's the first of the three remaining diamonds to see the error of her ways and side with Steven.
  • Too Important to Walk: She's a member of the Great Diamond Authority and travels by palanquin.
  • Tomboy and Girly Girl: Yellow Diamond has been compared to a businesswoman, wears huge shoulder pads, pants and Power Hair, and isn't talented at remaining stoic. Blue Diamond herself is introduced (in a flashback) wearing a cloak and gown and sitting on a throne like a traditional queen and always speaks calmly even when she's losing her (very short) temper and ordering an execution.
  • Took a Level in Cheerfulness: After she cries Tears of Joy in "Legs From Here to Homeworld" over sheer happiness at having "Pink" back, she acts far less sad from that episode on.
  • Took a Level in Jerkass: To an extent in "Reunited", though it's understandable given her circumstances at the time. She goes to Earth to make the Crystal Gems suffer and takes a no-nonsense approach when facing them.
  • Took a Level in Kindness:
    • She is noticeably nicer and more mature in the present day compared to her extremely callous behavior towards Ruby and Sapphire for accidentally fusing in "The Answer" and her attitude in "Can't Go Back", as she bubbled and protected all the Rose Quartzes from being shattered by Yellow Diamond, and allowed the other Quartzes such as the Amethysts to still be in service regardless of what Homeworld thought of them. Realizing her callousness towards Pink may have contributed to her apparent death may have contributed to this.
    • While she initially displays major Lack of Empathy towards organic life and the Homeworld Gems, she eventually comes to have more consideration towards both. She comes to show more Benevolent Boss tendencies towards her subjects in the present day and expresses sympathy towards Gemkind for having to suffer under Homeworld's tyrannical ways, and she is also cordial towards Greg Universe after he empathizes with her over losing a loved one, just before attempting to spare him from the Cluster.
  • Tragic Keepsake: Blue Diamond sees anything related to her dead fellow Diamond Pink as something to preserve and keep around her. She keeps everything from Pink Diamond's empty throne room and the bubbled gems of her former Rose Quartz servants, to the Human Zoo and the Quartzes from the Earth Kindergardens. When Greg, a human from Earth, shows her compassion, Blue Diamond decides to take him, too, in order to save what she believes to be "one last piece of [Pink Diamond's] legacy" from the Cluster. Yellow Diamond derides Blue Diamond's habit of collecting anything related to Pink Diamond as useless clinging to the past. In "Reunited", when she sees the surviving Crystal Gems and "Rose Quartz" still living on Earth, she is furious, seeing it as a grave affront to Pink's memory.
  • Tranquil Fury: Like her former subject, Sapphire, she usually keeps her composure even when angry, only displaying cold irritation. It is during the events of "The Trial" that she explodes, even yelling at Yellow Diamond when she goes on a rampage after being accused of killing Pink Diamond. In "Reunited", she remains remarkably soft-spoken even during a pitched battle against the Crystal Gems, despite her words making it clear she feels nothing but anger at their presence.
  • True Blue Femininity: She's a blue Diamond, after all. This seems to be a theme of her and her court since every Gem shown connected to her so far has been blue. In "Steven's Dream", she wears a simple shoulderless, figure-hugging gown underneath a cloak, reminiscent of old English mourning dress. This in direct contrast to Yellow Diamond's more masculine military jumpsuit.
  • Tsundere: Type A, though not to the extent of Yellow Diamond. While she acts condescending and strict most of the time, especially towards her subjects and Pink Diamond, she makes it clear that she cares a lot about Pink and her son Steven. After her Heel–Face Turn, she outright admits that what she's done to her own subjects was wrong.
  • The Un-Favourite: Unlike Yellow who holds some resentment, Blue speaks no ill of White, yet did mention to Steven in "Familiar" that her encouragement of Pink's games and sense of humor by simply calling a group of Pyrites "Fool's Gold", backfired and enraged White Diamond.
  • Unskilled, but Strong: She's as horrendously powerful as her rank suggests, and shrugs off a ridiculous amount of punishment. It must be noted however that she takes a ridiculous amount of punishment in the episode "Reunited", as she barely moves, her melee defense is rudimentary at best, she fails to land decisive hits and lacks any sort of plan to counter Steven's shield. She even has to pause to weep into her hands before her depressive aura can be sent out for the first time. Yellow by comparison turns the fight around in moments, demonstrating that she knows how to properly leverage her advantages. Justified since she is primarily a diplomat, unlike Yellow who is responsible for the military and Pink who fought in the rebellion. Also, it's entirely possible that she has never fought an enemy who could shrug off her Emotion Bomb and shield against her magic projectiles.
  • Unwitting Instigator of Doom: Tells Pink Diamond that "As long as you are there to rule, this colony will be completed." Unfortunately, Pink didn't want the colony to be completed, and this is almost certainly what led to her faking her death, and all the disastrous events that brought with it.
  • Unwitting Pawn: She's unaware Pink has been playing her and Yellow like a fiddle ever since she grew to love the Earth. It gets a bit sad when you remember she genuinely loves Pink.
  • Vengeance Feels Empty: When Steven sees into her mind, she admits harming the Crystal Gems doesn't bring her any joy or closure on Pink's death. If anything, it makes her feel worse by reminding her of Pink.
    Blue: What good will any of this do? The more I make these Gems suffer, the more I long to see you again, Pink.
  • Villain Has a Point: While she's obviously trying to murder Steven during "The Trial", she is right that the court has to observe the formalities, like the defense lawyer and defendant being allowed to make a statement, and said lawyer providing evidence of Rose Quartz's possible innocence. The formalities in fact reveal a lot of holes in Pink's death. Blue has been sensing all is not right with the official story and prods him, demanding answers. And considering she thinks that Steven murdered her little fellow Diamond, it's actually really merciful of her to correct him on the details of the murder, angry and sad as she is.
  • Villainous Breakdown: In "Change Your Mind", Blue starts losing her patience with "Pink" (actually Steven), even lamenting that "her" time on Earth had served as a bad influence on "her" moral judgement. When Steven calls her out on her condescending treatment, that's when she reaches her Rage Breaking Point and blasts him with an energy beam.
  • Visual Pun:
    • When we finally see her without the veil, she's grieving, and not only is she blue, but she has a long face. And unlike the cut of Yellow Diamond's gem, Blue's is uneven by being longer at the top and shorter at the bottom, giving it a similar appearance to a teardrop — ever since Pink Diamond died, her heart has been full of grief.
    • Her emotional powers force every Gem in her vicinity to feel as sad as her. Misery loves company.
    • Unlike Yellow, whose spiky hair resembles a helmet, Blue's hair resembles cascading waterfalls. Of the Diamonds, she's more prone to uncontrollable bursts of emotion, and ever since Pink Diamond died, her head has been full of grief, too.
  • Was Too Hard on Her: Her Heel Realization in "Change Your Mind" stems from this. Thanks to Steven, she realizes that her disciplinary method for Pink had been too cruel and was the reason for their estrangement.
  • Water Is Womanly: Blue Diamond is associated with water, wearing blue and having water-related powers such as using her tears to affect emotions and form clouds. She's also dressed in regal robes and is compassionate, intelligent, and patient.
  • We Have Reserves: More forgivable than most cases considering Gems can reform and would be good as new given a few weeks at the absolute most, but she doesn't bat an eye over 'casualties' on her side as long as the Crystal Gems get captured.
  • Well-Intentioned Extremist: Her words to Pink Diamond in "Can't Go Back" at least try to have some encouragement inside:
    Blue: ...But this is what you wanted. You BEGGED us for a colony of your own! And now all you want to do is be rid of it. First, too many organics, then their cities were too difficult to dismantle, and now these Crystal Gems? We’re tired of your excuses, Pink! This "Rose Quartz" can’t hurt you. You can’t be swayed by a few unruly Gems. (Pink tries to say something) Enough! You must understand... you are a Diamond. Everyone on this planet is looking to you. You don’t even have to do anything. Just smile and wave. Show everyone you are unfazed by this little... uprising. Your Gems will fall into line and these Crystal Gems will be... no more. As long as you are there to rule, this colony will be completed.
  • What Were You Thinking?: In a flashback in "Change Your Mind", she says this to Pink regarding an incident involving the latter letting loose a bunch of bug-like organics into the ballroom.
  • What You Are in the Dark: She secretly kept visiting Pink Diamond's ruined palanquin on Earth at the site of her shattering thousands of years after the Rebellion, knowing Yellow Diamond wouldn't approve of her being in a place where their fellow Diamond was killed by a Homeworld traitor.
  • When She Smiles: When she breaks out of her depression and smiles, her more elegant and regal features allow her to come off as endearing albeit a tad dorky. She also becomes more self-assertive and active whenever she isn't sad as when she found out about Pink's shattering being fake, she cried less and became motivated in helping Steven take Pink's place on Homeworld instead of neglecting her duties like she had before.
  • White Hair, Black Heart: Without the veil, she's shown to have bluish-white hair, though it's played with; she was shown to be extremely callous towards Ruby and Sapphire for accidentally fusing in "The Answer", but her cruelty doesn't extend to her fellow Diamonds, who she deeply cares for, and she seems to have developed a sense of empathy for humans as opposed to Yellow's outright contempt for organic life.
  • White Sheep: She's the first of the remaining Diamonds to realize the abuse Pink had to suffer through, rebel against Homeworld's tyrannical ways (which she had to enforce), and seek to restore the bond between herself and the other Diamonds.
  • The Woman Wearing the Queenly Mask:
    • She's highly revered by her Homeworld subjects, but behind closed doors she's a sad and depressed woman who's in perpetual mourning over her dead fellow Diamond Pink and wallowing in her own guilt over her failure to prevent her death.
    • In "Can't Go Back", she tried educating Pink on this, instructing her to "smile and wave" to show her subjects that the Crystal Gem rebellion was really nothing to worry about. This is what partially led to Pink rebelling in the first place.
    • She admits in "Change Your Mind" that she's been "suffering in silence for ages" from the way Homeworld does things, just like Pink was and like the Diamonds' Gems still are. In her attempt to talk to White Diamond, she admits that, while she knows that her purpose as a leader of Homeworld isn't to be happy, she nonetheless is finding it increasingly more difficult to enforce White's will when it just brings misery to herself, Yellow, and those that they rule.
  • Woobie, Destroyer of Worlds: When we see her in the present day, she is obsessed with her grief over Pink Diamond, trying to gain closure from looking for answers on how exactly her family member died and who did it.
  • You Are Better Than You Think You Are: Her speech to Pink Diamond was probably intended to be this, as she encourages Pink to stand strong in the face of the rebellion and tells her that she can complete the colony she begged for. Shame that what she mistook for being an Ungrateful Bastard was actually Pink having had a Heel Realization...
  • You Have Failed Me: Responds to Ruby screwing up Sapphire's visions and fusing with her by ordering Ruby's gem broken.
  • You Will Be Spared: She takes Greg with her back to Homeworld to be preserved in the Human Zoo after he shows her compassion, believing she's saving him from being killed by the Cluster (or so she thinks).


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