Crypt Question

I just got the crystal by using the bauble stick. Where do you use this thing? After hours of running around all accessible areas looking for a place to use it i have found none. Reluctantly i turned to the mini walkthrough included with the game and all it tells me is to use the crystal in the big room to call the elevator. Ive been trying to use it in there forever but cant find anything to click on it with.

In the big room, there's a wall with a big skelly picture on it. That's the elevator. The crystal is the call button. It goes in the socket on the wall on the left side of the elevator.