Are you sure your clothing isn't covering up the jewelry? Lots of clothes do.
That's something that we reported in the Beta test. The clothing your character is wearing simply cover up the Amulets that you put on. It should be on a fix list for when the more major things (i.e. game play affecting bugs/glitches) are taken care of.
But it's just aesthetic, they all still work as they're supposed to, you just can't see them right now.
