I was originally going to just draw hands, but then I thought of something: "What if White Diamond created the other Diamonds?" Since we still don't know a lot about them (well, I don't, I'm waaaaayyy behind), I was just experimenting and adding on to a few other theories, most notably one I've seen about Pink Diamond possibly being an off color. So, maybe White Diamond created the others by assigning them an element? Blue from water, Yellow from fire, Pink from earth, while White herself ascended from the air?
