[Jewelry making - Article 00159] - Re: [Orchid] Finish behind stones

[John Donivan]

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>     but in my study of faceting, the process is all about cutting the
>     stone at the proper angles to bounce the light around inside and
>     back out the top. Light from the back 

    Noel, all of what you say is essentialy true, and there's another
    post today about RI and critical angle. The problem is that the
    majority of stones today are diamond cut or nearly. For an aquamarine
    to be cut respecting it's RI would be something very different - I
    don't know the math on it, but it wouldn't be diamond cut. I think
    people like, and expect, those proportions in any stone. Meaning that
    MUCH light in a citrine, for example, is coming through the back and
    even the girdle. I also think this whole thread is to some degree
    (not the RI part, the metals part) pedantic. Any variation in the
    finish behind a set stone, unless it's really "glassy", is going to
    give infinitesimal results in the apparent look. My solution is
    simple - don't have a back, drill the hole to 80% of the stone width,
    which is more proper anyway. One simple test for a (round) CZ,
    besides just looking at it, is to turn it upside down over some
    newsprint or something. You can see the print through the CZ, but not
    a diamond. A graphic illustration of the importance of RI. 

http://www.donivanandmaggiora.com

 
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