[Jewelry making - Article 00654] - Re: [Orchid] Heat treatment of Topaz

[Galarneau's]

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    Mr. Bhansali, First of all I would buy the book "Gemstone
    Enhancements" by Kurt Nassau.  In the book he describes the
    mechanics of the irradiation and heat cycle used on many different
    gemstones.  You can forget about the specifics.  How much radiation,
    how much heat, in what sequence of steps and durations are all
    secrets of the industry.  Yes, they know how to keep their mouths
    shut and make money.  Even in the USA the cycle is not disclosed. 
    You can have material treated, but they will not tell you how they
    accomplished the treatment. Gerry Galarneau 
   www.galarneausgems.com

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