[Jewelry making - Article 00620] - Re: [Orchid] Open Back or Not

[MillsGem]

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    Gerry, Faceted stones reflect from internal surfaces and do not
    require open backs. To suggest otherwise is to say that a stone set
    in a tube setting will not sparkle. Au contraire!  A PROPERLY cut
    stone is based on the assumption that the refractive index of the
    mineral will determine the angle of reflection of the stone. This is
    EXACTLY why windowed stones don't sparkle !   Ron at Mills Gem, Los Osos


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