[Jewelry making - Article 00062] - [Orchid] Golden topaz - citirne

[Steve Green]

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    Dear Gerry, 

    I know you mean well and I really do not want to get into another
    debate with you, but here I go. 

    I go to Mexico all the time, grew up there still have a house there,
    run my biz there and I guaranty there is no known citrine deposit
    there of commercial value. (madeira citrine or any citrine deposit
    for that matter)  Somebody is giving you bad info. Madeira is from
    Brazil. 

    All the topaz in Mexico is from San Luis Potosi area inspite of the
    label "Guerrero" (Guillero sic) that was given to it years ago. 
    This material  does turn darker with cobalt irradiation but is not
    light stable before or after this simple irradiation procedure. I
    heard it is stable if treated to blue but I am not sure of this.
    This irradiated Mexican material looks nothing at all like Ouro
    Preto Imperial Topaz - Not in the rough or in the finished gem. The
    color of all irradiate topaz whether in the brown or in the blues is
    nothing like fine Imperial from Brazil. Brazilian imperial can be
    fuchsia colored in its finest natural colors. BTW inspite of what
    others have said here there is a difference in topaz both chemically
    and crystalographically (whew) between Ouro Preto Brazilian
    imperials and other worldwide topaz sources. I have gone over this
    in past posts. Just look at the crystal morphology and color range
    to see how different it is. 

    It is not just heat treatment that is necessary after irradiation to
    turn topaz to blue, but also you need topaz that will turn (not all
    will) and you need the correct type/intensity of radiation. Cobalt
    60 is not used for blues, but Linacs and other irradiation sources
    are. 

    And as far as not being able to trust dealers.... stop generalizing
    ! 

    Thanks and I am not trying to make you mad, just clear the air a
    little. I have tons more to say on this thread. I have seen alot of
    partial truths about the topaz and citrine subject lately. Being the
    end of summer, I have just been a little too distracted to get
    involved till now. 

Respectfully,

Steve Green      Rough and Ready Gems      www.briolettes.com



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