A great source for vintage closeout stones/parts for repair is Wolf
Myrow in Providence, stones/crystal chain Hord Crystal (NYC ?), and
stones/faux pearls/miscellania John Allen in Providence. Sorry I
cant supply contact infor at moment, but all of my files are packed
for moving in a couple weeks.
I have found that using an iron and little creme brulee torch work
great. A friend places his pieces in a clay like plumbers compund
called Dux seal to hold/insulate for soldering. Not tried that yet
but he raves about it.
Best of luck and definitely price high!
Michael A. Gaines Distinctive Jewelry