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Alexandrite

Tsarstone collectors guide

Alexandrite Guide Forums

Who sets the standard for price and color-change for Alexandrite? on Feb 18 2007, at 16:06 in Alexandrite buyer's guide. Chapter 9, Alexandrite gemstone buyer and collectors guide.
<![CDATA[Color-change is determined by counting the number of facets that change color in the stone when looking down through the table of the gem. The GIA labels these changes by using the terminology of Weak (considered color-change crysoberyl), Medium, Medium-Strong, Strong, Very-Strong. Other labs and several international governmental agencies use a numerical grading which is determined by the percentage of facets changing color. These conditions are performed scientifically but the reading of them is subjective. Therefore, color-change strength may be rated differently by different gemologists

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