Yellow Diamond is one of the main antagonist of the Cartoon Network series Steven Universe. She is one of the Gem Matriarchs on the Gem Homeworld. Along with Blue Diamond and White diamond. She is voiced by Patti LuPone and made her first physical appearance in the episode “Message Received”.
Yellow Diamond was first mentioned by Jasper in the Season One episode "The Return." Yellow Diamond is most likely either the leader of the Gem Homeworld, or Jasper's and Peridot's superior given the fact that both Gems have a yellow diamond on their outfits. Yellow Diamond also appears to be a greatly feared Gem given Peridot's and Lapis' reactions to Jasper mentioning her.
Yellow Diamond could be seen briefly during a screening of Steven Universe while Rebecca Sugar was attending the San Diego Comic-Con. She could be shown giving a side glance while she was conversing with Peridot, Lapis, and Jasper. It is revealed in “It could've been great” that she, along with her fellow authority members, planted The Cluster (an extremely large forced gem fusion) in order to colonize Earth for the gem kind, which will make the human race extinct in the process. This information is found in her moon base, form which Peridot stole a communicator.
Later, her mural is seen in It Could Have Been Great.
In “Message Received” Peridot attempts to call for her, but the gems keep delaying her, until she successes. However upon talking to her, Peridot realizes that the Earth is still very rich with potential and organic life. Which makes her change her mind and tries to talk her Diamond out of the entire Cluster plan. However she rudely refuses, and reveals that she doesn't care at all about organic life, angered, Peridot calls her a clod. Yellow Diamond then finishes the call and sets the communicator to explode. However Garnet easily blasts it away.
In Hit the Diamond, she sends five Ruby's to retrieve Jasper for some unspecific reason.
In Monster Reunion it is revealed that the diamonds (including Yellow Diamond) used a light producing weapon that corrupts gems and turns them into monsters on their own soldiers, having apparently no choice after losing the Homeworld War.
In "That Will Be All", Yellow Diamond enters Pink Diamond's Zoo, where she appears to be annoyed by Blue Diamond. Yellow Diamond wishes to bring Blue Diamond "back to reality", which she believes is moving on from Pink Diamond instead of constantly grieving. Yellow Diamond sings "What's the Use of Feeling (Blue)?" to Blue Diamond, where she expresses that although the Diamonds still love and always think about Pink Diamond, they need to move on and start looking forward. Yellow Diamond discovers that all Blue Diamond wants is to get more humans for the Zoo, so she asks Sapphire if the Cluster emerged yet. When Sapphire says no, Yellow Diamond turns to Blue Diamond and says "then there's still time".
In "I Am My Mom", Using the report she received from Peridot in "Marble Madness", Blue and Yellow Diamond send Aquamarine and Topaz to Earth to retrieve the different human varieties mentioned by Steven during his very first interaction with Peridot.
In "The Trial", Yellow Diamond and Blue Diamond arrive in the court room on Homeworld to run a trial against Steven (whom they believe is Rose Quartz and Pink Diamond's murderer). Upon seeing Steven for the first time, Yellow Diamond tells Blue Diamond that they should shatter him just for taking on a "hideous form". Upon Blue Diamond's wishes, Yellow agrees to the trial, and summons her and Blue's thrones. When Green Zircon addresses Yellow Diamond by many names, Yellow becomes irritated and tells her that "my Diamond" will suffice. After Green Zircon makes her case with the help of Eyeball, Yellow Diamond is convinced that Rose is guilty and believes it is time to execute Steven, but the trial continues upon Blue Diamond's wishes so the defense can speak. Blue Zircon wishes to remind the court that Steven turned himself in, which Yellow Diamond replies "the court remembers, and the court does not care". When Steven tells the Diamonds that he shattered Pink Diamond, Yellow becomes relieved, thinking that the trial is over because he confessed. Blue Diamond asks Steven how he shattered Pink Diamond, and he makes up a story because he doesn't know. This causes Blue Diamond to become distressed, so Yellow calls a short recess and goes to comfort Blue.
As Blue Zircon makes her argument, asking the Diamonds how a Rose Quartz got past Pink Diamonds entire entourage, Yellow Diamond becomes outraged; she slams her fists down and yells that her entourage was there and they saw the whole thing. Yellow Diamond yells to Blue Zircon that Rose must have slipped past Pink Diamond's Agates and Sapphires. Once Blue Zircon blames the Diamonds for the death of Pink, Yellow stands up and poofs her with her finger, and then uses an electricity attack to poof Green Zircon. Right afterwards, Yellow tells Blue that they don't need to listen to that "nonsense", and that they can shatter Steven and be done with it. Blue yells at Yellow, asking if she can restrain herself, to which Yellow responds that the trial is pointless. When Steven and Lars escape on Blue Diamond's Palanquin, she cuts a hole in the side of the building. Yellow Diamond stands at the edge of the hole and tells Steven "You think you can get away, Rose? You stood your ground on that little speck called Earth...But you're on our world now."
- She is similar to Lord Dominator
- Also, she can be compared to Dr. Nefarious, due to her hate for organic life and goals to destroy planets.
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