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What is the reason why 750 platinum diamond ring is blackened by electroplating? Pray for the great God.
Hello, 750 platinum means that the platinum content of diamond ring is only 75%, and the remaining 25% is a mixture of other rare and precious metals.

It is estimated that the reason for blackening is that 25% of other precious books have been exposed to things containing sulfur chemical elements.

You can take it to the jewelry store, and the master can repair it for you.

I hope it helps you.

Thank you.