[Jewelry making - Article 00201] - Re: [Orchid] What turns diamonds yellow?

[Jon Michaels Jewelers]

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    Dear Donna, Over the years, I occasionally run into a customer's
    diamond that has picked up a yellow color, and after asking
    questions, have come to the opinion that the problem may come from
    their water source.  Often they have well water that is very "hard",
    and high in mineral content, and it results in a build-up on and
    under the diamond.  Try a bath of warm pickel overnight, or if that
    is not enough, you may have to go to sulfuric acid to remove the
    deposits. 

Good luck,
Jon

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