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> Maybe, but it doesn't apply to rough. I wouldn't even know where
> to start with a grading system for rough. There are seller
> descriptions like "eye clean" or "90% clean", but it depends on
> whose eyes :-)
> From my perspective clarity grade for rough should not be even
> mentioned.
I am looking for non GIA descriptor like "cobbed". If you ask for
GIA clarity grade, and seller will provide with one, you know that
seller is full of H2S. However, hue, tone, and saturation are very
useful and should be asked for.
> Even for finished stones, there's controversy. The late cutter
> Jeff Graham said "I do not use or agree with GIA's grading system"
> for colored stones. That certainly didn't stop him from selling his
> product.
Graham's disagrement with GIA system is largely based on absence of
"flawless" grade. His point is easy to understand if one considers
that Graham was a competition cutter and could produce flawless
gemstone. I would be upset also, if some academic would make my work
non-existent based on statistical likelihood of the event was
virtual zero. I myself would like for GIA to reconsider their
approach, but this is very minor and practically does not affect
anything.
Leonid Surpin
www.studioarete.com
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