[Jewelry making - Article 00617] - [Orchid] Heat treatment of Topaz

[Dharmendra Bhansali]

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To All members,

    I have radiated white topaz, it turned brown. Than I heated it at 200
    C (for one hour) ,it became white. But I want it to become blue.
    Anyone can guide me why topaz became white after heating instead of
    blue. Is there another process of heating after radiation? 

    In Chanthaburi(Thailand), there are heat treaters,they are expert in
    heating process.If anyone can give me contact info. of heat treaters
    in Thailand. 

Thank you in advance.
Dharmendra
e-mail:    sagarart AT vsnl.com 

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