Cathie- You’ll have to use a low temp lead type solder. It can be
very tricky and you will have some loss. It can be done though. I’ve
done a bunch of costume repair over the years.
I prefer Tix brand solder and a very small flame for this operation.
Also if the piece is a collectable designer piece, say an Eisneberg
or Dior, you understand that by altering it you will destroy the
value of it as a designer piece? if you must, I’d suggest a fold down
bail so that it can be hidden and worn as a pin or pendant when
ins by the way are making a big comeback from the 50’s-60’s when
they were big. Check out Margaret Thatcher’s collection.
Have fun and make lots of jewelry.