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Grading a color change gems?
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How do you grade alexandrites ?
Latest color grading alexandrite by David Weinberg on Nov 27 2006, at 06:12

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Anonymous
Forum author
Posts: 32

Grading a color change gems? on Nov 12 2006, at 15:22

Hello everybody,

I am looking for the color grading manual. How do you describe alexandrite colors? Are there any grading specifics or rules? How should I evaluate alexandrite color change?

Thank you
David

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David Weinberg
Primary contributor
Posts: 23

color grading alexandrite on Nov 27 2006, at 06:12

There are no international standards to grade the strength of color change in alexandrite and the better labs may use master stones to grade the strength of a color change. Most labs use something like strong, moderate, or weak to describe the strength of a color change. For color grading, the GIA system is the most convenient and they offer a program called something like gem Ewizard that is useful. There is some variation as a function of the monitor you are using. Although the system is not perfect, it is the best practical system to grade colored gemstones and we use it.

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