[Jewelry making - Article 00511] - Re: [Orchid] Odd effect on surface of stones

[Karl Chaundy]

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    Thanks to all who have contributed to this thread. 

    The effect is not from a fingerprint - the lines are too far apart.
    Think of the way height of hills on an ordenance survey map are
    shown. 

    The effect is visible to the naked eye from a foot away. 

    I've noticed it on both 'corundum' and 'peridot' of fairly deep
    colour. 

    It may be Topaz then as Mr. Aalund suggests. I am reluctant, though,
    to spend money on such a stone and show it to a gemologist just to
    find out if it is a synthetic or not.


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