The Chat Gem is a gem that appeared between the game and chat windows on Diablo II Battle.net. Players soon discovered that this gem could be clicked on and would change. The color would change, and when it changed a message would pop up into the chat, stating: "Gem Activated." When clicked once more, it would say: "Gem Deactivated". On rare occasions, a message would appear (mind you after a LOT of clicking) "Perfect Gem Activated", and other times: "Moooo."