The Accredited Gemologists Association (AGA) will give gemologists a better understanding of the "why's" and "how's" of diamond grading during its 2008 Las Vegas conference. The session will help gemologists sort out what goes into the decisions behind what ends up on the diamond-grading reports issued by labs such as the Gemological Institute of America (GIA), the American Gem Society (AGS) and the Gem Certification and Assurance Lab (GCAL).

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