A Diamond and a Morganite.

Normally fusions of different classes were forbidden from homeworld, but the fourth royal diamond wasn't one to follow home worlds rules. she had found a friend in a morganite, constantly fusing together until her slightly younger 'sister', white diamond, had banished her onto a very small planet, which had no life forms yet. What happens when she goes into a deep slumber in her fusion, not waking till billions years later to find a human-gem boy, and his friends, standing before her. She seems familiar to Steven, and he reminds her of someone from her past as well.