When re-tipping worn prongs on a cluster of stones that will not withstand the heat of your torch, such as emeralds or jade, first remove all the stones. Then select a piece of gold tubing to just fit over the prong. Cut pieces of tubing the length of the prong, and place over each prong (you may need to file some of the prongs to fit the tubing). Solder in place with medium solder. With a little shaping and polishing, you have new prongs ready to re-set the stones. Using this method each prong is easily placed in the correct position, and they will not shift while soldering the other prongs.
~Unknown Jeweler
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