- American Gem Society
- The Gemological Association of Great Britain
- Asian Institute of Gemological Sciences
- Canadian Institute of Gemmology
- Dr. Smigel’s Gemology Course
- HRD Antwerp
- 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
- Bahrain Institute for Pearls and Gemstones (Danat)