[Jewelry making - Article 00085] - Re: [Orchid] Light entering faceted stones

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    	Dear Fellow Orchidians, 	Concerning our discussion about light
    entering a gemstone: JCK has an article in June 2002 on Diamond
    cutting "Tolkowsky Revisited", following is a paragraph directly
    lifted from the article: 			 

    Cowing credits Bruce Harding as the  first to determine "where each
    point on the diamond gets its light and then researching and
    mathematically determining pavillion and crowm angles which avoid
    light's being drawn from the observer's head or from below the
    gemstone's girdle." Harding's work was published in an article
    entitled "Faceting Limits" in the Fall 1975 issue of	 GIA's Gems and
    Gemology."This work has had a significant impact on the design of
    optimum angles for cutting colored gemstones," says Cowing. 	 

    	As to my prior postings I am grateful for support that was
    serendipitious, gemstones can be cut that do not allow light to enter
    from the pavillion for maximum enhansement of the qualities that make
    a gemstone beautiful and desireable to the person viewing the stone,
    assuming you set them right side up... Of course not all gems are cut
    to this criteria. Hopefully this will help those that purchase gems
    to learn to tell the difference. It will make a difference in selling
    their work, theirs will stand out against the competition in my
    opinion. Mine does. 

Richard on a rainy day in a very dry Denver 

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