All types of Gemology. AGT GEM LABORATORY in agreement with the GIA, gives the GIA courses in Japan.  Diamond grading, and colored stone grading. 

The American Gem Trade Association Gemological Testing Center (AGTA GTC) is the natural colored gemstone industry's premier independent laboratory.   The AGTA GTC serves the industry and the public with a comp ...

The AGS lab supplies the trade and the consumer with the Diamond Quality Document, the Diamond Quality Report, and a small basic report called the Diamond Consultaion. The Diamond Quality Document ads to the traditional ...

The American Gemological Laboratories is an independent organization which grades colored stones and diamonds.

The Institute is the Only Diamond Cutting school in the United States that is licensed to teach the prestige profession of Diamond Cutting and Rough Diamond Grading in all its phases.

Each accredited member of the American Society of Appraisers has earned a professional designation in one or more specialized areas of appraisal. To receive the accreditation, the appraiser must pass intensive written ex ...

Gemological Programs

Gem Identification, gem testing, full laboratory. Test done to international gemological standards. Diamond color treatment detection available.

The Accredited Gemologist (A. G.) Program . Seminars and Short Courses. Guest Lecturers