Morganite

Morganite is a former Homeworld Gem living on Earth under the guise of being a Human. She took part in Rose Quartz's Rebellion against Homeworld, and was once the sort of caretaker of Quartz, however while she technically doesn't look after Quartz anymore, they still stick close by. Quartz usually doesn't like to admit this, however, as she is embarrassed by Morganite.