GS Laboratories of America, Inc. (GSL)

GS Laboratories of America, Inc. (GSL) is an independent gemological laboratory providing diamond certification, gem testing and jewelry certification services. GSL is a subsidiary of Gem Scan International, Canada's largest and most utilized gemological ...

Professional Gem Sciences (PGS)

Uniform and Consistent Grading - PGS is one of the few labs that promise and deliver uniform and consistent grading. Both PGS offices have identical 1 carat diamond master sets for proper comparison and diamond color grading. By setting standards one stat ...

International Gemmological Institute (IGI) New York

AGTA Gemological Testing Center

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 complete range of colored gemstone and ...

Jewelry Insurance Appraisal Institute

Appraisal Courses

EGL USA - Los Angeles

EGL USA is one of the world's premier independent gemological laboratories.  For over 25 years it has offered the fine jewelry trade and consumers accurate, reliable gemstone identification and professional certification to validate their gemstone pu ...

International Society of Apprasers (ISA)

Certified Appraiser of Personal Property Program

Texas Institute of Jewelry Technology

Full Service School with Gemology and Jewelry ManufactureThe field of Gemology is an essential element in the jewelry business . A complete study of the charicteristics of gemstones, the style of cuts and gem identification assure a grounded working kno ...

Jewelers Education Foundation

Business, Appraisal and Sales Courses

International Gemmological Institute (IGI) New York

Educational programs: Polished and rough diamond courses, colored stone courses, diamond correspondence courses.