Olivine appears to have a kind of aggrivated face, so it can be inferred that she isn't a very nice Gem. She has a big green dress that covers her shoulders to her legs. She has a big bun with two bangs on each side of her head.
Olivine is described by GemCrust to be a regal Gem.
Olivine possesses standard Gem abilities, bubbling, shapeshifting, fusion, regeneration, agelessness, and superhuman strength/durability.