She’s meant to foil amethyst or who amethyst would be if Steven wasn’t around and she didn’t have a way to move on from Rose Quartz. Basically the diamonds are who the crystal gems would be if they didn’t have Steven around since due to the caste system they support they can only rely on each other. Amethyst is temperamental and if you give her a crown and infinite power she can pretty much do as she pleases.

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