well, with an older character who knows more about gemkind and homeworld, just as much as Aquamarine, or maybe more since I'm not entirely sure how much she knows, there will be speculation considering that we as viewers still know very little about homeworld and the true history of the gems. We know that three diamond figures lead, and it is possible that Rose may have been the fourth, we know they destroyed planets with Kindergartens, and we know that their current technology is far beyond that the Crystal gems have.