Four Treasures Reference Database
Record No. 2331
Colored stone grading—To be or not to be
Journal Article
Hughes, R.W. (1988) Colored stone grading—To be or not to be. Gemological Digest, Vol. 2, No. 3, pp. 11–15.
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gems, color science, colored stone grading
Discussion of some of the issues of colored stone grading.