With what Jasper said in -the return- implying other pearls, and with the four color diamonds witch may indicate a 4 tiered leadership on home-world of with Rose Quartz may or may not of been one of.... i know a lot of guessing going on here   I Figure that each leader most likely had a pearl underling. Sounds like a reason enough to draw it out to me. And seeing as pearls naturally come in seven different colors (not counting the several colors in each base group) that is all the more to play with.

any how this one is Black Pearl who (in my Universe) follows Yellow Diamond, fiercely loyal, never asks questions and always dose what shes told. She often gets sent to -clean up- other gems messes..  most often that includes the unfortunate gems as well.

Another pearl in my collection:

Golden Pearl