[Jewelry making - Article 00270] - [Orchid] Odd effect on surface of stones

[Karl Chaundy]

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Hi all,

    I've seen an odd pattern on the surface of stones in various gem
    stores and stalls. 

    I'm wondering if its a tell tale sign of a synthetic. 

    The best way I can describe it is a wavy film with a sheen similar
    to oil on water on the facets of the stones viewable only at certain
    angles. Is it a by-product of treatment? A synthetic? 

    Am I being paranoid? 

    Any explanations welcomed. 

Karl.

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