When sizing, make the ring 1/8 size too small. Clean the solder joint on the inside of the ring only. Next, place the ring on a ring mandrel and hammer across the solder joint until the ring reaches the correct size. Finally, clean up the outside of the ring with a file, emery, and polish the ring. This will help you to be more accurate in your sizing (if you are a little too large you will need to resize). In addition, this will work-harden the sizing area making a stronger joint, and finishing and polishing will be easier.
~Unknown Jeweler


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