Board Thread:General Discussion/@comment-26408694-20141004142023/@comment-24986099-20141012192232

Something to note; A Gem's body is variable, they can change it at pretty much any time they want.

Amethyst can shape-shift on command, Garnet can stretch her arm out to an amazing lengths, Gems can swap outfits on command, and when Pearl retreated into her gem; she had changed her default outfit.

Their bodies are projected holograms, for all we know Garnet could have removed her two additional arms or Opal and Sugilite could have just added two additional arms.