The Spider Gem is a Corrupted Gem that encountered the Crystal Gems back at the Crystal Temple.
Appearance
It takes the form of a large spider-like creature with four legs. Its gem is located on its abdomen.
History
Season 1
After Garnet, Amethyst, Pearl, and Fulgurite became affected by the Poison Joke, the Spider Gem found them and attacked them. This assault kept up for a while, the spider Gem nearly shattering them before it got poofed by Lapis Lazuli.