Little does Steven know, the Diamonds are just a really cool intergalactic basketball team. Those planets the gem are holding at the Moon Base? NOT PLANETS AT ALL! Basketballs! They just wanted to slam jam across the galaxy. But Rose Quartz (or should I say, Rose Courts) couldn't stand that her team, the Crystal Gems wasn't nearly as good. So she got rid of the Diamonds up and coming star player, Pink Diamond! Or maybe this all just happened in a fanfic.