This is an RPG. Gems are an immortal, humanoid species made of inorganic minerals that inhabit the land of the planet. They are conscious and walk normally. Due to the rise of the oceans there is only 1 island which is the only land in the world. The gems live there with a being called Adamant. The adamant trains the gems and puts them in positions for them to defend themselves from Tsukijins Beings that appear to hunt the gems and use their materials as decoration

So who are you in this world?