Can it be 2 amulets.. If so 2 necklaces of Talos

Also you can wear the Falmer hat with any hats..

I completed Gauldur's quest but I can not wear two necklaces!!! Has anybody found what triggers the bug??

Guessing the OP went to jail and this is related to the armor stacking bug posted in other threads.

I had the same thing happen to me, just with torso and head gear.. I wanted to change my equipment during a fight with a giant-tribe, and ended up with a dragon mask, ebony helm, archmage robe and ebony armor =)
Best thing was I got the stats from all of them, so I pretty much nailed those giants