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Steven Universe has enough cases of I Knew It! to fill its own page.

Unmarked spoilers ahead.


  • Many people correctly guessed that the girl from the title sequence (who was later revealed to be named Connie) would eventually go on to become Steven's love interest.
  • Some viewers were correct in guessing that the monsters the Crystal Gems fight are other Gems, which was hinted at in "Monster Buddies" and later stated in "Ocean Gem".
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  • It was guessed pretty early on that Garnet was likely a fusion, with some even narrowing it down to Sapphire and Ruby specifically based on Garnet's colors, among other things, both of which were eventually confirmed in "Jail Break".
  • Lots of people theorized that Sardonyx was the fusion of Garnet and Pearl, which was confirmed at a Comic-Con panel in 2015.
  • A lot of people correctly guessed that Sapphire has only one eye, which was officially confirmed in "Keystone Motel".
  • Other people were also correct in guessing that Vidalia is Onion and Sour Cream's mom, and Yellowtail's wife, confirmed in "Onion Friend".
  • It was a reasonably popular theory that Peridot's body was artificial in some way, although many took this all the way and asserted that she was merely a Gem controlling a robot body. After Peridot detached her foot in "Friend Ship", many shifted toward believing that she had prosthetic limbs, which turned out to be the case in "Catch and Release". A decent amount of fanart even got very close to guessing how she looked without the robotic limbs.
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  • "Back to the Barn" confirmed that there are multiple Pearls and that they are a Servant Race on Homeworld (and, more widely, that there are multiples of each Gem). Although, many people more specifically thought Pearls were supposed to be smart and tech-savvy, with our Pearl's gracefulness being something she picked up on Earth. It's really the other way around.
  • "The Answer" confirmed, among other things, the existence of multiple Diamonds, who seem to be in a position of royalty, something theorized since "The Return".
  • "Message Received":
    • The episode confirmed the theory that the Diamonds, even the supposedly rationale-driven Yellow Diamond, made the Cluster as a spiteful way of completely annihilating Earth (and any trace of the rebellion once lead by Rose Quartz) rather than for any sort of strategic or long-term value.
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    • Quite a few people had actually correctly predicted that Peridot would grow disillusioned and turn against Homeworld after establishing contact with Yellow Diamond. A few even predicted she'd call Yellow Diamond a "clod". And sure enough, come "Message Received", all of the above happened when Peridot attempted, unsuccessfully, to convince Yellow Diamond of the planet's strategic value, only for Yellow Diamond to state that she didn't care about that, she just wanted the planet destroyed out of spite.
  • Many people correctly guessed that the Watermelon Stevens would be involved in some way with the return of Malachite. "Super Watermelon Island" revealed the Zerg Rush of the former hindering the latter so that Alexandrite could finally win the match.
  • A few people guessed that Lapis was a civilian who wasn't a part of the war that just got caught in the crossfire.
  • A more humorous example of this would be that someone correctly guessed that Lapis' human name in "Hit the Diamond" would be "Bob".
  • Many fans predicted that "Drop Beat Dad" would involve Sour Cream and Marty, and that it would confirm the latter as the former's biological father.
  • Quite a number of fans guessed that Gem Corruption was caused by the Diamonds.
  • Many fans correctly predicted that Jasper would return in "Alone at Sea".
  • About a year before the airing of "Earthlings" and the debut of Steven and Amethyst's Fusion, the Tumblr blog Texts Between Gems joked that such a Fusion would have a yo-yo as a weapon.
  • Due to the Crystal Gems not being documented citizens, them not understanding many human traditions, and Greg being open-minded about many things, many fans speculated that Steven was conceived out of wedlock. "Gem Harvest" confirmed that Greg and Rose never married each other.
  • Many fans, looking at the old version of the Diamond Authority symbol (four diamonds forming a bigger diamond, instead of three intersecting triangles) and a partially-seen mural at the Moonbase, theorized that there was once another Diamond Authority member called "Pink Diamond" (as the diamond missing in the modern symbols was pink), that her gem was on her navel (due to the placement of the pink diamond at the bottom of the symbol), and that she was probably killed during Rose's rebellion (since Gem structures dating before the rebellion have the pink diamond, whereas gem structures dating during the rebellion or afterwards have the modern symbol, and the pink diamond at the Sky Arena had been broken). It is later confirmed that Pink Diamond did exist — she was the ruler of Earth back when it was a gem colony, and Rose Quartz's rebellion was against her.
  • A lot of people of theorized that Dewey would start working at the Big Donut following his electoral defeat in "Dewey Wins". Sure enough, come "Letters to Lars", this happens.
  • After lots of red herrings and general all-around mystery, one of the most popular fan theories since "Sworn to the Sword" came true in "A Single Pale Rose": Rose Quartz really is Pink Diamond. She shapeshifted into Rose Quartz to lead a rebellion against herself to save the planet that she'd grown to love but couldn't officially spare, and faked her own shattering to get Homeworld to leave, assuming her Rose Quartz identity permanently. This is one of the show's most interesting examples, as many fans who did subscribe to this theory abandoned it seasons prior, when the show had revealed that Rose killed Pink. A "fact" that every Gem on the show believed (or in Pearl's case, perpetuated) until the plausibility of it was questioned in-show at the beginning of Season 5. This Tumblr post summarizes many of the things fans picked up on.
    • After Pink Diamond's gem is shown to have an upside-down brilliant cut in "Jungle Moon", people started theorizing that Rose's gem was Pink's, shapeshifted so that the pavilion pointed inwards instead of upwards. "A Single Pale Rose" reveals that that this is exactly the case.
    • Around the time of "The Trial" to "Your Mother and Mine" (which is when we first see a flashback of the event), people started theorizing that the Gem eyewitnesses saw shattering Pink Diamond was Pearl, shapeshifted to look like Rose Quartz (the trauma related to the event being why she hasn't shapeshifted since). This was confirmed to be true in "A Single Pale Rose" — though Pink Diamond was only apparently shattered, but actually only poofed.
    • And one last theory confirmed in that episode was that every time Pearl covered her mouth before she said something regarding her past with Rose was not her trying not to say something Steven was not ready to hear, but rather a literal involuntary reaction to say something she literally cannot talk about. Sure enough, it is the remnant of Pink Diamond's last order to her as a Diamond, that they were to never speak of the event again.
  • Following some leaked keychains showing Ruby and Sapphire in wedding attire, fans started speculating that the two would get married, which they do in "Reunited".
  • Quite a few people predicted that Centipeetle and her crew were Nephrites, and her commander being a Hessonite, based on her drawing in "Monster Reunion" resembling the Hessonite in Save the Light.
  • Even before the title of "Legs From Here to Homeworld" was leaked by CN France, giving it away in a sense, fans correctly guessed that Pink's ship would be shaped as legs, and would be the pink structures seen in front of Rose's landfill, seeing as Yellow Diamond's ship was a right arm, Blue's was a left arm, and a structure showing White Diamond's head and torso is seen in "The Trial", confirmed in "Legs From Here to Homeworld" to be her ship. "Change Your Mind" confirms that the ships make up a Combining Mecha.
  • Steven's dream at the beginning of "Together Alone" confirms a theory about White Pearl that has been popular ever since her debut: that she used to belong to Pink Diamond, based on their shared gem placement as also seen with Yellow and Blue's Pearls.
  • Many predicted that Blue Diamond would be the first of the Diamonds to change sides, since she was the only one of the Diamonds willing to make amends. "Change Your Mind" confirmed this to be the case, after she realizes how terrible Pink Diamond felt under the pressure she and the other Diamonds have put her through, going even so far as to directly rebel against Yellow to help Steven.
  • Many people (some jokingly) predicted that the fusion of Steven and Pearl would have an umbrella as a weapon. The fusion also calls themselves "Rainbow 2.0", which is likely taken from the fandom.
  • Many people predicted that the fusion of all four Crystal Gems is named Obsidian, based on early concept art of the Crystal Temple in Art & Origins calling it the "Obsidian Temple".
  • Even the darker twists in "Change Your Mind" were predicted: this Tumblr comic, originally published on July 29th, 2018 (about 6 months before the episode's premiere) and this animation from October 5, 2018 both predicted White Diamond pulling out Steven's gem, but with a significantly different outcome than what would happen in the show, and this edited screenshot on Reddit predicted the Crystal Gem Pearl suffering the same fate as White Pearl.
  • Speaking of White Pearl, from the moment she made her brief but memorable debut appearance, almost all fanfics involving White Diamond worked on the assumption that (a) White Pearl's strange appearance and behavior was the result of something White Diamond did to her, and (b) whatever she did to make her that way is something she can use on other Gems to turn them into extensions of herself, which alone would make White Diamond a truly nightmarish foe. "Change Your Mind" proves this (though interestingly, White Pearl's cracks are still there once she's freed from White Diamond's control).
  • Following her corruption in "Earthlings", many comics featuring a healed Jasper depicted her as carrying some of her "monster" traits over. Usual choices were teal spots, horns, and maybe a spike or two. Come "Change Your Mind", the ending shows Jasper returning with spots and horns, as well as other Crystal Gems and Homeworld Gems saved from corruption.


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