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Monday, 29 October 2007

river. (1) An early trade term still used by some dealers to designate the finest color grade of Diamonds; i.e., an extraordinarily transparent, colorless stone. For an approximate comparison of this grade to those used in the color-grading systems of the Gemological Institute of America and the American Gem Society, refer to chart in Appendix entitled, Com­parison of Several Different diamond Color-Grading Systems. (2) Any dia­mond found in an alluvial deposit.

See GIA COLOR-GRADING SYSTEM, AGS COLOR-GRADING SYSTEM, COLOR GRADE.

 
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