[Jewelry making - Article 00092] - Re: [Orchid] Silky Aquamarine

[leonid surpin]

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>     When the crystal grows sometimes there are other things that
>     happen, which I can't define scientifically (GG's?) and very fine
>     lines grow inside of it. It's similar to rutilated quartz, but
>     microscopic in scale. 

    It is difficult to say anything conclusively without seeing the
    stone, but the most likely scenario is that "silky aquamarine" is
    actually what is know as black beryl. Black beryl gets its color
    from micro inclusions of black spinel which oriented along the plains
    perpendicular to the optical axis. Black colour is observed only in
    the center of such crystals. The surface of the crystals, can be few
    inches deep, is grayish-blue and if cut would produce something
    which can be called "silky aquamarine". Strictly speaking, it should
    never be called and aquamarine. 

Leonid Surpin.
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