I just noticed a monk on my realm (Forgot his name, and he dissapeared while I was googling this), had an extra socket in his Sha Touched fist weapon. So he had the 500 agi Sha gem + a 320 Agi JC gem. I've googled the weapon, and it clearly only got the Sha Touched gem slot.
Anyone got a clue how this is possible? As a JC I'm realy curious.. ^^