I just answered a question on Yahoo! Answers about this and USEP only gave this response which I quoted to him as the answer:
"Something of note, the Amulet of Kings can supposedly be worn only by a Septim heir. So it is strange that Mankar Camoran is wearing it with ease, even though it always slips off the player's neck when equipped."
What are your thoughts on why he can wear it and our characters can not?
I'm sorry if this has been asked before. I haven't used the boards often.
And if it's in the wrong section, I apologize again.