[Jewelry making - Article 00838] - Re: [Orchid] Analyzing faceted stones

[Linda Walsh]

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    Well, you could measure the angle with a common protractor, but if
    your angles "work", then they are greater than the "critical angle"
    for the material that you are using - in this case, quartz.
    http://www.rockhounds.com/rockshop/gem_designs/refractive_index/ has
    more than you probably want to know about how the critical angle is
    determined from the refractive index of the material you're cutting.
    If you're not interested in the theory behind the practice,
    http://www.gemcutter.com/angles.htm has a list of the critical angles
    for most gem materials.  Cutting your stones at these angles will
    create reproducible gems that "work". 

Have fun!
Linda in MA


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