[Jewelry making - Article 00141] - Re: [Orchid] What turns diamonds yellow?

[Charles Heick]

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    Donna, the yellow color you see in diamonds is caused by Nitrogen
    atoms replacing carbon atoms within the crystal lattice or crystal
    structure of the diamond. Nitrogen is the impurity, and the more
    Nitrogen atoms present, the more intense is the yellow. If I
    understand your question correctly, you believe that the yellow
    color in your diamond has become more intense over time. I have
    never heard of this happening, nor do I believe this is possible
    without special treatment. Maybe you are looking at your diamond
    under different lighting conditions, such as incandescent lighting
    instead of natural. Charles Heick Cincinnati, Ohio

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