"Parasite Gems. Always paired with a host Gem. Together, they formed "Infused Gems". All host gems were destroyed thousands of years ago after they became too unstable. The Parasites would get weaker the farther away they were form their host, so the ones that are still alive are hardly a threat to Homeworld, and are thus left alone."
Peridot sighed and closed the holo-screen. She already knew everything about Parasites. After all, she was one.