[Jewelry making - Article 00941] - Re: [Orchid] Grams per carat - opals question

[Rick Martin]

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>      2.  How do I factor in the ironstone backing on the doublets? 
>
>         If its an ironstone backing, its most likely a boulder opal or
>     seam opal. A doublet is constructed, and usually has a black
>     backing piece, such as onyx or basinite. 

    Dave and All: there are many man-made "boulder" opal doublets on the
    current market with ironstone backing.  They are very well made and
    can fool the unwary.  In any case, doublet or natural, boulder opals
    are professionally sold by the piece not by weight.  The same is true
    of any assembled opal, doublet or triplet.  Opals are sold by carat
    weight only when they are "naturals," 100% opal. 

Rick Martin
MARTIN DESIGNS

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