C.H.
Try Christopher's Jewlers. They are next to the Maternity store and Big and Tall by Chandler Fashoin Mall (on the other side of the 101). I am not sure if they buy jewlery, but they can create anything you want. Maybe you could have it melted down and remade into something else. It is a local family owned business and they do amazing work. They offer different price ranges as well. Talk to Chris himself, his dad Rusty does the work at the shop.
FYI they are closed mondays.