[Jewelry making - Article 01062] - Re: [Orchid] Repairing concave facets

[polymetric]

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    Hello Ann, It has been long known that a curved facet would magnify
    the optics inside gemstones releasing a bounty of color and
    brilliance. This type of cutting began long ago with carvers and
    also faceters mounting spheres on the arbor spindle to make the
    table into a lens or place dimples in the stone. In the late 1980's
    my father the late Doug Hoffman invented, developed and patented the
    OMF concave faceting apparatus. OMF stand for "Optical Magnified
    Facet" and is a separate base that rotates and reciprocates a
    cylinder cutting lap (mandrel) that allows the faceter to place
    precision repeatable concave facets about the indexing of the
    gemstone. Here is a link to a somewhat recent article by Colored
    Stone Magazine that tells more about it. 
    http://www.tucsonshowguide.com/stories/cuts.cfm Here is a link
    showing OMF cut stones by artist Richard Homer set in jewelry and
    comparisons of native cut stones that Richard recut. 

    I have many more links if you are interested. 

Thanks :) 
Zane Hoffman


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