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Leda I have done this with an amber cab - frightening but possible!
I hold the ring in self locking tweezers as near the head as possible
and position this over a dish of water so that the whole of the stone
is underwater. A wet wad of something behind the stone gives extra
reassurance. Now solder the joint with a really hot flame (I had to
use an oxy-acetylene welding torch!). The water will sink so much heat
the very hot flame is essential.
Frightening but quite a sense of achievement - I probably wouldn't
have risked it if I couldn't have cut a replacement for the amber
though. Andy Parker, Agate House Lapidary Ulverston, Cumbria, England
andy AT agatehouse.co.uk www.agatehouse.co.uk Tel: 01229 584023