to get this earring you will have to enter the epic sone condemned catacombs, there you will have to kill a lot of monsters to get 15 artifacts, kill 4 watchers, and then get 3 statues, you get the statues after slaying many named encounters, beware when you pull in the dungeon you may get up to 15 heroic after you (me and my group actually killed all 15)
long inside the dungeon you will find the boss ancient watcher, he is epic encounter and killed my group in a few blow.
this zone is recommanded for a group in level 30