[Jewelry making - Article 00614] - Re: [Orchid] Appraising fancy colored diamonds

[Richard]

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Douglas,

    Two books than can help further your education in colored diamonds: 
    Hofer, S., Collecting and Classifying Coloured Diamonds and my own
    humble offering (see link at bottom of page).  You will also find
    three interesting articles in G&G spread over several years. 
    However, color evaluation in fancy colored diamonds is very tricky,
    if you have no experience you should defer to the experts.  Most
    reasonably fine colored diamonds, if worth evaluating, are color
    graded by GIA.  The GIA-GTL grading report is the sine qua non of
    color grading.  When I am evaluating a colored diamond I insist that
    we begin by obtaining a GIA cert. 

    Price charts do exist, e.g. The Guide, but the rarer the color the
    less accurate they become.  They are ok for yellows and browns but
    close to useless with blues, greens, pinks, reds, oranges. 

    Richard 

    Kindly check out our online gallery:  www.rwwise.com 

    For Information and sample chapters from my new book:
    www.secretsofthegemtrade.com

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