The new artifact, Tirakai's Maul, has a socket that you can stick a gem in, and the maul gets more powerful with better gems and has funky elemental effects. If you put a new gem in when it already has one, it takes the old one out.
...or at least, that's what it's supposed to do. What happens is that instead of giving you one gem back, it duplicates the stack of those gems in your inventory. Did you have 10 topaz? Now you have two stacks of 10.
Gonna have to report this one, but just imagine all the merchant randarts...
