[Jewelry making - Article 00075] - Re: [Orchid] Setting - cone shaped hole

[richard hart]

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>         Each gem material has it's own Critical Angle and good cutters
>     try to polish stones with the best proportions that also take into
>     account that gem's CA. If cut properly, you can place any round
>     brilliant stone culet-down on printed paper and not be able to
>     read the print. Even table-down is difficult with high RI stones. 

    If you have ever seen a tube set or flush set stone, while it is on
    the finger it is not receiving any light from the back. That is the
    simplest way to understand that if a stone is cut properly,  it never
    has, never is, and never will be refracting or reflecting light from
    the back. 

    I explain to my customers it is the same as a mirror. Light behind
    the mirror cannot be observed from the front. 

Richard in Denver

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