Garnet puts her hand on Pearl’s shoulder a lot. In “Serious Steven” and “Coach Steven” its a gesture of reassurance like “don’t worry, its ok” and Pearl usually responds to this despite it not being followed by compelling evidence to not worry.
In “Laser Light Cannon” she does it in an entirely different context but I included it anyway
It’s the hardest thing I’ve ever done, without a doubt, both physically and emotionally, because the way we’re doing it, I go back and forth between both girls without any break. I’m not able to just play one thing out. I have to switch constantly. It makes me feel like patting your head and rubbing your stomach and you’re not sure what you’re doing anymore. - Sarah Paulson