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The Gem race is ruled by a strict caste system led by four supreme rulers: White, Yellow, Blue, and Pink Diamond. Gems are not born; they are artificial, immortal beings grown in the ground using extractors that drain the life from organic planets. Each Gem type is custom-made for a specific purpose, such as Pearls for servitude, Peridots for engineering, and Rubies for military defense. Stepping outside of your designated role or changing your physical form permanently is strictly forbidden in Homeworld society.The Rebellion and the Fake AssassinationThousands of years ago, Pink Diamond was given Earth as her first colony but grew to love its organic life. When her fellow Diamonds refused to halt production, Pink adopted the secret identity of a rebel Quartz soldier named Rose Quartz. She founded the Crystal Gems—alongside her loyal Pearl and a rogue, fused Gem named Garnet—to fight for Earth's freedom. To permanently end the conflict, Pink Diamond staged her own assassination, pretending that Rose Quartz shattered her, which forced the Homeworld forces to retreat.The Diamond Blast and CorruptionIn retaliation for Pink's apparent death, the remaining three Diamonds launched a devastating, corrupting light attack from space. This blast was meant to wipe out all Gems on Earth. Rose Quartz managed to shield only her closest friends—Garnet and Pearl—while every other Gem on the planet was magically mutated into mindless, monstrous beasts. For millennia, the surviving Crystal Gems lived in seclusion on Earth, capturing and bubbling these corrupted monsters in hopes of one day finding a cure.Steven's Inheritance and HealingThe modern era begins when Rose falls in love with a human named Greg Universe and gives up her physical form so her half-human son, Steven, can be born. Steven inherits his mother's gemstone and her unresolved past. Over time, Steven learns the dark truth about his mother's double life, repairs relations with the Diamond Authority, and uses his unique emotional powers to finally heal the corrupted monsters. By Steven Universe Future, the empire has transitioned into a peaceful democracy, leaving Steven to process the deep psychological trauma of carrying his mother's legacy.