[Jewelry making - Article 00128] - Re: [Orchid] What turns diamonds yellow?

[David Barzilay]

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    You ask: "What turns diamonds yellow?" Answer: Nothing. (with the
    possible exception of  radiation.) It is possible that the diamond
    was "off-color" (yellow-ish) and the color was being masked by the
    way it was set. It isn't common, but unscrupulous dealers have been
    known to 'paint' diamond girdles to improve the apparent color. It may
    have gotten dirty recently, in a way that would make it appear that
    the color had changed. But I believe it is very likely that the
    inherent color has not changed. I will be interested in the opinions
    of other Orchidians. David Barzilay, Lord of the Rings

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