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Rhodium Plating darkens or blues the diamonds

Q. We very carefully clean all objects before Rhodium plating. However, very occasionally, some of the diamonds will have a darkened or bluish coating which we are not able to remove. What causes this effect and how can we remove it?

John Arrowsmith
goldsmith - Brenham, Texas
February 2, 2010

A. Respected sir, you dip that jewellery in hydrochloric acid, boil it for fifteen minutes without washing, using tweezers you do ultrasonic in base media solution. Do steam this for few seconds, then see result.

Bhupesh Mulik
- Mumbai, India
February 7, 2010

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