American Gem Society
Asian Institute of Gemological Sciences
Canadian Institute of Gemmology
Dr. Smigel's GEMOLOGY COURSE
Ecole de Gemmologie de Montreal
Gemology Institute of America - Colored Gemstone Program
Harvard summer course
International Gem Society
International Gemological Institute
International School of Gemology
PGS Laboratory Gem Stone Courses
Swiss Gemmological Institute SSEF
The Gemological Association of Great Britain
