Yellow Diamond is 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.
- 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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