A place for CZ masters in diamond color grading
- Michael D Cowing
The Journal of Gemmology/2008/Volume 31/ No.3/4
Abstract: Over the last 20 years and despite recommendations to the contrary, many gemologists are appraisers have gravitated to the use of cubic zirconia (CZ) master stone sets to assist in the color grading of diamonds. This investigation revisits with new insight, diamond grading technique and methodology. It addresses the judicious use of CZ master stone sets to augment diamond masters that are smaller in size and number. Study results support the use of accurately graded, carat-size CZs in reducing the subjectivity of color grading when only incomplete (every other grade) diamond master sets of small (under 0.4 ct) sizes are available.
Useful link:
www.gem-a.com
I think it was interesting to learn why CZ masters have found a place in the color grading of diamonds in the trade/labs. If effectively used/periodically checked for retention of accuracy CZ masters are practical/functional.
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