Steven Universe - The latest StevenBomb practically ruined the "Rose Quartz is Pink Diamond" theory, but from its ashes a new popular theory has arisen

Or Rose killed Pink Diamond and that's what Convinced Homeworld to get the F--k off earth

I had thought about that too when I saw that their Pearls were color-codded. And it can make a bit of sense. Even her hair matches the picture a little, similar to how it does with the Yellow Pearl.

Maybe White Diamond mistreated her, even tossed her aside, then Rose took her in. Be a stark contrast with Rose making her feel like she "was everything."