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Rhodium plating residues on white cubic zirconia

We are a medium sized jewelry mfr in Thailand.
White cz-set 925 silver jewelry has to be rhodium plated for several customers. We normally apply a rhodium coating of 1 to 2 minutes. If, for some reasons (repair during production etc.) the rhodium plating has to be applied twice, the white stones start to appear grey-dull, as if coated by rhodium. How can this greyish appearance either be avoided or removed.

Werner ULRICH
Mondial Jewelry Co. Ltd. - Bangkok, Thailand
2005

I suspect the stones are being burned in the repair process. Silver conducts heat very fast and the stones need to be protected from oxygen during the soldering operation.

Neil Bell
Albuquerque, New Mexico
2005

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