Author's Note: I'd personally like to thank Chloe, a certain someone I know in real life, for giving me ideas about this fanfic, including the idea that Korra is a Homeworld Gem at first. Love you. ^^
This will start at just after the end of Book 2 and end at the finale of 4. Though unlike the actual series, Korra hasn't met Asami, Mako, or Bolin until then.
(Also, some of the male characters that are Gems in this AU (mostly villains) will be feminine-presenting despite their gender in canon (Zaheer, Unalaq, etc.), because Gems are feminine-presenting aside from Steven, not counting fusions. If they're kept human in the AU, though, then they'll stay male).
Great., thought the impatient blue gem. Chrysocolla had finally finished off the corrupted Gem, but was almost shattered. The rebel Gem's sharp shards lay about. And as if she ever considered Unakite to be something of what a human would call a mother. The call of the glowing mystery Gem that saved her was still pulsing in her ear. Now the battlefield was desolate and dark in the remains of Unakite.
She thought to herself what happened. Monsters were surrounding her. Unakite was corrupted from fusing with a monster she called "Vaatu". Chrysocolla cried out in fear from feeling the corruption herself, from being forcibly fused with another monster, the corrupted remains of her friend "Raava". But Raava almost seemed to form back into her uncorrupted self...or some kind of mysterious Gem took over, and Chrysocolla found the strength in herself again. The rest was a blur, but Unakite had been shattered.
The other two Chrysocollas Unakite took under her wing seemed almost indifferent to the entire situation, even their mentor's destruction. In fact, facet 1E4S, cut 2KA said that "in the eternal darkness, I couldn't begin to see a hint of Unakite's former self anywhere in that."
But now she was on Earth, as the other two Chrysocollas left without her, leaving her exhausted and the poofed Gem of Raava in her hands. She could feel the effects of the fusion still within her, but luckily she knew the corruption was out from the analysis from one of her partner's Peridot escorts. Now two rebels were gone, but what now? Her closest friend was corrupted for nothing!
She readied her powers to poof the other corrupted Gems, but stopped herself slowly. As they surrounded the destroyed landscape around her, images of Raava in her corruption plagued her mind. "I don't think...I can do it." she muttered. "Why can't these monsters stay with us? It shouldn't be hard. They were just like us." Not to say she was too soft. After all, she was facet 2K4A, cut 3OR! She was known for being feisty among the Gems made specifically for powers involving the "four elements".
She brought herself away from the battlefield, using her control of water similar to a Lapis Lazuli to bring herself across the oceans of the planet, trying to see where the nearest warp pad was. Was there really no sign of other Gem activity? The other Chrysocollas most be lost. She snickered a little thinking about them as stuck as her.
Peeking from the sea again, she found herself on...some sandy surface and looking out of the water, she saw something: human civilization.