when possible avoid using leaded solder on silver. it causes a eutectic reaction at a very low temperature and can destroy the piece during later repair attempts if you have a few pictures of the piece before you jb welded it it might help. you can test to a certain degree the solders makeup using acids and a reference piece and watching the reaction. chances are unless it was a extremely poorly crafted piece it would have been made using a silver solder. i have actually seen a beautiful silver hollow bracelet ruined because the refractory bed it was being soldered on contained a small piece of leaded solder( which burned a hole through it) so if you post a pick we could help you a bit more