The Baby Volleyball is a pearl featured in the episode "Porous Pockets." SpongeBob thought it was a baby, but Patrick thought it was a volleyball, so SpongeBob came up with the name of "Baby Volleyball." They started playing volleyball with it, until someone told them it was of great worth. They sold it, and SpongeBob became rich.
The pearl is light purple and is very shiny and round. In comparison to the characters, it is quite large. It is shown to be valuable and worth a lot.