It seems, from this code, that endlessly clicking on the chat gem might do something towards granting a beta invite. It’s not enabled yet, and may never be; it could be just an Easter Egg for clever fans to discover. A quote from Tilitoon in the same thread:
The D3.Gem as well as the BetaSignup objects are not defined. So basically every time you click on the gem, the counter is incremented on the clientside but it does absolutely nothing besides that (yet), until they implement the BetaSignup function (which would trigger an ajax call to the appropriate page).
Just think; you might get the chance to wear out your mouse before you even start playing Diablo III!
If you’re looking for an alternative, if you can’t get on their forums or are banned from them, then. I’m sure you’re find it welcoming with lots of happy helpful members.