There is a colored gem in the middle of the Lobby interface, which is initially blue. When I click on it, it turns purple and says ‘Gem Activated’. When I click on it again, it turns back blue and says ‘Gem Deactivated’.
What is the gem supposed to do?
Perhaps it starts their dishwasher, No one knows.
It does nothing, it’s there as a fun feature that throws up random messages, it was added by a designer as nothing more than a bit of fun.
yea but it also increases your magic find
iF you press it enough you’ll find others messages, but it’s rare, and useless. Just a “feature” to make people talk …
It makes the servers go all wonky so if you’ve been clicking it you’re to blame for the server issues.
Realy, it just works as intended. There is even an Option for it in Options-screen…
You have to click it until you get lucky and “Special Gem” activates.
When this happens and you managed not to spam-click it off again, go ahead and open a game and enjoy the increased rates ! 
It’s the best hidden secret in gaming history. Only a select few know what it really does 
You have to reach level 99 with all classes in the span of 3 ladder seasons to unlock the mystery.
Its exactly this, a gem to rack one’s brain xD