The Star Jelly is a rare and obscure mob that spawns exclusively during Meteor Showers. They are very similar to slimes, but they jump diagonally as though a corner is their "face" rather than one of the sides of their cubic bodies.
In appearance, star jellies are similar to slimes, but lack any eyes, and have bluish translucent skin as opposed to green, speckled with a few silvery fragments. Their core is made up of a gradient from more blue to a silver color.
On death, Star Jellies drop silver and iron, as well as, very rarely, diamonds. Sadly for players, due to their unpredictable spawns, Star Jellies are not a reliable source of diamonds.