The Disco Ball is the central focus of the third story in Issue 3 of the Steven Universe comic series. It was a gift to Steven from Garnet, Amethyst, and Pearl.
Appearance[]
It appears to be a hand-sized disco ball with a socket at its top. When lit up, it sparkles with pink, yellow, blue, orange, and scarlet colors.
History[]
In Issue 3, Steven begged Garnet, Amethyst, and Pearl to let him go and face off against "super special rare" gems. Garnet assures him that he isn't ready yet, and hands him the disco ball. Steven assumes that the ball is a super special gem and that the Crystal Gems want him to harness its power.
When the gems return, they find Steven passed out next to the ball, defeated. He laments that he wasn't able to figure out its secrets, to which Garnet replies by informing him that it is a disco ball. She plugs it in, causing it to light up. Steven stares in amazement and says that it's more amazing than he could have ever imagined.