[Jewelry making - Article 00038] - Re: [Orchid] White sapphire value

[leonid surpin]

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Ahmed,

>     Any eye clean stone over 5mm is always in demand, a 7 mm stone
>     going for as much as $ 200 per piece, there are several reasons.
>     one main reason being the Thai buyers buy it in bulk to Defuse,
>     since the stone has no color I am told its easier to predict the
>     out come. and be treated to any color. 

    thank you for confirming my post regarding the low value of white
    sapphire. You said it yourself that "Thai buyers buy it in bulk to
    Defuse, since the stone has no color " So all we have to do now to
    determine the intrinsic value of the white sapphire is to take a 
price
    of surface diffused sapphire, subtract the cost of labor,
    transportation, storage, marketing, and etc. and we should arrive at 
a
    figure indicative of white sapphire intrinsic value. 

    Another mistake, you are making, is in attributing value to the
    white sapphire based on size. While it is true that value of 
sapphires
    increases rapidly as the size increases, the relation only holds for
    the gems of exceptional colour. The reason lies in the fact that
    rough sapphire crystals have bipyramidal shape characteristic of
    members of hexagonal group. The optic axis runs from vertex to
    vertex. Since the best colour direction is perpendicular to the optic
    axis, even the relatively large crystal would yield a small round or
    oval gemstone. The same crystal would yield 3 times as large gemstone
    if table orientation would be parallel to the optical axis. Since
    white sapphire has no colour to worry about, it is cut to obtain the
    maximum yield, and that is why it is incorrect to imbue value to the
    white sapphire based on size. 

Leonid Surpin.
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