I inherited my Grandmother's diamond studs, and I love the classic style. However, we originally though that the backs were screw-on to ensure that you don't lose them (my mother had bought them for her a long time ago). When I got them, I realized that they weren't, but hadn't had a problem keeping them on. Lately, I have lost them 3 times and am now afraid to wear them. Does anyone know about how much it would cost or how easy it would be to get them re-set or re-mounted with the screw on backs? I don't want to lose the integrity of the diamonds or even change the metal, I just don't want the backs to keep popping off. Thanks for your advice!