Q: How do I size a platinum ring up?

A:
1. Using a side cutter, cut the shank from the right and then the left. This will create two opposing pointed ends. Spread the shank open to the desired size using a mandrel.
2. Cut a piece of sizing stock to the required length for the desired size. Using a saw, cut a V-shape on either side of a piece of sizing stock. File it to fit on the shank ends. Check for fit.
3. Insert the piece of sizing stock into the ring. Be sure it fits snug.
4. Using hard 950 platinum solder, solder the piece of sizing stock to the shank. Be sure solder flows all around.
5. After filing the inside, round the ring on the mandrel. This will also work-harden the shank for easier finish.
6. File, sand, and polish the ring after the dove tail sizing.

THINGS TO CONSIDER:
Pick sizing stock of the same alloy as the ring to assure color match.
Pick sizing stock of the approximate dimension of the actual ring. This will reduce filing and waste.
Be aware of stones in the ring. You may need to protect or remove them before sizing.
Make the ring about 1/4-1/2 sizes small and hammer the shank to the proper size. This will harden the shank and finishing will be easier.
Remove all scratches with fine abrasive paper before polishing.
Be sure and replace the quality mark (Pt950).

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