I would suggest looking for a jeweler that deals in "estate" jewelry. But be prepared, because the mark-up on jewelry is somewhere in the neighborhood of 200%, you'll only get pennies on the dollar. My other suggestion is to try e-bay or craigslist. For this one I'd go e-bay over craigslist simply because of the risk of getting robbed. But even there be prepared to not get a lot of money. I bought a pair of aquamarine stud earrings for only $5 (set in sterling).