[Jewelry making - Article 00100] - Re: [Orchid] Frustrated with final designs

[kpkelly]

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    Peter, I think you would be hard pressed to demonstrate light
    entering the pavilion of any well cut stone. In the last paragraph you
    mention colored stones with lower refractive indices.  Just for
    those who may not know:  if you stick a stick in water it looks like
    it's broken where it enters the water.  That's because light travels
    at different speeds depending on the medium it is passing through. 
    Many of the stones ( crystals) we use are cut with this in mind.  A
    stone properly cut will not allow light to leak out.  On the other
    hand, a windowed stone is improperly cut and will allow light to leak
    out of the pavilion or other places diminishing the brillance of the
    material.  The "lower refractive index" is not better than a high
    r.i.; it's just different.  Each stone, that has a crystalline
    structure, has an appropriate refractive index because of the way
    light behaves in that particular material. These comments apply only
    to stones that have a crystalline structure and to the oddball opal 
    that can possibily be faceted.  KPK

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