Sizing Down: Platinum Cobalt with no Diamonds in the Shank Using a Torch

Quality Assurance Benchmarks highlight workmanship for semi-finished or finished jewelry. Learn how to evaluate the quality of a platinum cobalt ring with no diamonds in the shank that was sized down using a torch.

Evaluate the quality of a platinum cobalt ring with no diamonds in the shank that was sized down using a torch. Contains video and illustrations.
Perspective view of a platinum 4-prong solitaire with no diamonds set in the shank

Potential Problems and Engineering Features

Avoiding Problems by Using Proper Torch and Soldering Techniques

Hold the platinum ring with tungsten carbide- or platinum-tipped tweezers. Place a few layers of tissue between the tweezers and the ring to prevent scratches.

How-to Video

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Tool and Topic Related Info

Consumers often ask to have the removed piece returned to them. In this case, the removed piece has a weight of 0.3 pennyweights.

Close-up view showing a platinum band with a piece removed from the ring shank in preparation for sizing it down

Featured Quality Assurance Benchmarks

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Remove Platinum Cobalt Oxidation

Removing Oxidation from Platinum Cobalt



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    Learn how to determine finger and ring sizes accurately. Contains video and illustrations

    Determine Finger and Ring Size

    Learn how to determine finger and ring sizes accurately


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      Prefinishing Platinum

      Prefinishing Platinum

      Prefinishing: Best practices for prefinishing platinum



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        Evaluate the quality of platinum jewelry that has been worn and then refinished.

        Refinish Worn Platinum Jewelry

        Techniques for refinishing worn platinum jewelry


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