TBH, it looks like Garnet controls the arm with Sapphire's gemstone, and the one at the bottom diagonal from it. While Pearl controls the arm with Ruby's gemstone, and the one at the bottom diagonal from it.
I drew a big ol’ Steven Universe scramble, I really like how it turned out! If you come see me at Otakon I’m gonna be selling it as a print. Steven Universe is a good show and I’m super glad kids have it! Some of the episodes are hit or miss for me.