[Jewelry making - Article 00031] - Re: [Orchid] Setting - cone shaped hole

[Jack Schmidling]

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>         hmm- my understanding is that gems are cut at angles to
>     _maximize_ reflection of light. The principle of optics demand that
>     some light pass through any transparent substance/air interface,
>     even as it requires some to be internally reflected. Only opaque
>     substances do not allow any light to pass through. 

    Well, perhaps it is a matter of semantics and I don't recall who the
    original poster was.  I understood her to mean that light from a
    hole in the bottom could pass through the stone to a viewer looking
    into the table. This would be a window defect. 

    Light must "pass through" the stone from the top so it can be
    reflected back out the top by the pavilion.  The difference is the
    meaning of "through". It must not mean through and out the bottom. 

js

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