As my old goldsmith boss would have said, just smash out the broken
stone. Smash the stone, clean out the stone chips, anneal the
setting, youmay need to true up the seat with burs and then pop in a
new stone, andset it. If the stone is a common one and easy to
replace, then do that. If you are trying to solder with stone in
place, find someone who hasa laser welder, and do the soldering with
the laser welder. Hope that helps
Joy