In Diablo 2's battle.net chat interface, there is a gem embedded in the middle of the interface.
Clicking on it yields the chat message
Gem Activated
and clicking again yields the message
Gem Deactivated
Sometimes, the message will seemingly randomly read
Moooooooo!
and other times,
Perfect Gem Activated
This gem also appears on the Diablo 3 official site:
In which game director Jay Wilson said
The Chat Gem… It's working correctly and has more than exceeded our expectations. And nightmares.
What does the chat gem do for Diablo 2's gameplay? Or how does it change the official Diablo 3 website when clicked?
Best Answer
From the Diablo Wiki:
Further information from the Blizzard Insider (also taken from the Diablo Wiki):
Further information, especially regarding the gem on the Diablo III site:
To sum it all up: It doesn't really have any effect other than being something you can click on and get a random result that ultimately doesn't do anything.