[Jewelry making - Article 00705] - Re: [Orchid] The Rings Book by Jinks McGrath

[John Donivan]

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>     that the culet should have a measurement (of its own). How can
>     that be? If it comes to a point or a line, how can it have a
>     diameter? 

    Hello again, Kelley. The culet of a stone is considered a facet.
    It's generally listed as "none, small, medium or large", depending.
    Some stones, especially old cuts, might have a culet that's 1 1/2 mm
    wide on a larger stone. What any of that has to do with making a
    setting or setting a stone I do not know. All of the heights on a
    stone are measured in a direct line, i.e.: put your gauge on the
    culet and the table and that's your measurement. Usually the
    pavilion depth (from girdle to culet) is done with a ruler that's
    square to the plane of the stone, under magnification, because you
    can't lock a gauge on both of them. You do not measure a stone down
    the angle of the pavilion from the girdle to the culet unless you're
    just curious - I guess you could use trig to figure it out that way,
    too, if you wanted to..... All the pertinent measurements are done
    on an imaginary center line going from the center of the table to
    the culet (for a round stone), and of course the girdle diameter. 

http://www.donivanandmaggiora.com
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