Standards For Testing Jadeite

(via Australian Gemmologist, Vol. 23, No.2, April-June 2007)

In late 2006, The Gemmological Association of Hong Kong released HKSM/JJT-2006 titled ‘Standard methods for testing Fei Cui (jadeite jade) for Hong Kong.

This standard has been prepared in consultation with members of the Hong Kong gemstone and jewelry industries via the Task Force for Gemstone Testing—a body established under the Accreditation Advisory Board of the Hong Kong Accreditation Service. This 2006 version replaces a previous 2004 version.

The stated purpose of this standard is:
1. Definition of the nomenclature for Fei Cui.
2. Provide standardized practice and methodology for testing Fei Cui, and,
3. Provide set technical specifications for the format and comments used when issuing certificates of identity for Fei Cui.

Contents of this standard begins with a precise definition of Fei Cui, its major physical properties, and a tabulation of the various types of Fei Cui (Types A, B, C, and B+C) that are available commercially. Systematic standard testing methods are then described for shape and cut, dimensions, weight, transparency, color, polariscope examination, refractive index, specific gravity, fluorescence, Chelsea Filter reaction, VIS absorption spectroscopy, microscope examination, and FTIR spectroscopy. Chinese language versions of the definitions of Fei Cui, its properties and its various types are presented in three appendices at the end of the standard.

This precise, standardized approach to testing Fei Cui deserves to be copied for testing other major gemstones.