Country:United States
GS Laboratories of America, Inc. (GSL)
gslabsusa.comGS 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)
www.progem.comUniform 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 Society of Apprasers (ISA)
www.isa-appraisers.orgCertified Appraiser of Personal Property Program
International Gemmological Institute (IGI) New York
www.igiworldwide.comEducational programs: Polished and rough diamond courses, colored stone courses, diamond correspondence courses.
Jewelry Insurance Appraisal Institute
www.jcrs.com/JCRS_for_jewelers/CIA_training/certified_insuraAppraisal Courses
Jewelers Education Foundation
www.jewelerseducation.orgBusiness, Appraisal and Sales Courses
EGL USA - Los Angeles
www.eglusa.comEGL 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 ...
AGTA Gemological Testing Center
www.agta.orgThe 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 ...