Although marquise gems have been around for a long time, this marquise gem seems to originate from E-027's theatre used during his invasion onto Earth. We aren't sure of its true origins, if it was made by E-027 or something or someone else.
E-018 is a marquise gem, hence the name, that often floats in rooms and has a bright blue glow to it. It seems to carry "Soul Essence", something only found through this entity. It is self-replicatable, if one disappears, another one takes its place. While slow, it can be used to make cutting edge technology capable of reviving dead people, alongside creating new souls and soul-bending, although we haven't used it in full effect.