Sanding Jewelry?

[Ariannrhod]

A few days ago I bought a lovely spoon bracelet at my local salvation army. It looks lovely but I can't wear it for long because no matter how tight or lose I have it wrapped one end digs into and rubs my wrist raw, the first night I had it I wore it to bed and woke up the next morning with my wrist looking like I'd spent the night playing an interesting game of bondage with my boyfriend. I moved it to the other wrist and wore it around for a few hours before realizing it was chafing my wrist.
Is there some way to sand the rough bit without damaging the bracelet? What sort of sand paper should I use, would an emery board work? Or do I need to bite the bullet and take it to a jeweler?