These pieces are damaged more easily than fine jewelry and they are also more difficult to repair. Replaced rhinestones and some wear are acceptable to most collectors, but re-enameling, replating and soldering often are not. I just want to add a word about caring for your treasures. The greatest threat to rhinestones is water because of the foil backing. If even one drop of water seeps behind a stone, it will tarnish the foil.
Water is the reason why once bright stones now look dingy.
Try to store your rhinestone pieces in individual boxes. Many people wrap each piece in tissue to prevent them from getting scratched. Since the glue that was used gets brittle with age, check the stones from time to time to make sure none have loosened. In New York City, Norman Crider at Trump Tower and Rita Sacks at the 55th Street Antiques Center have wonderful costume jewelry. That Shop at 27 Old State Road in New Milford and Glen Leroux at 68 Church Lane in Westport.