Gemological Institute of America (GIA)

An independent nonprofit organization, the Gemological Institute of America (GIA) is renowned for its impartial service as the world's foremost authority in gemology. The Institute's history of ground-breaking scientific research, education, and gemological laboratory services reads as a virtual chronicle of the industry's own growth and sophistication.

From 1953, when Richard T. Liddicoat created and introduced the International Diamond Grading System™ to the position the Institute holds today as the most respected grading and identification authority in the world GIA has combined the principles of research, education, and service to help gem and jewelry professionals around the globe use science and product knowledge to sustain the public's trust.

The GIA can be reached at:
Gemological Institute of America (GIA)
World Headquarters
The Robert Mouawad Campus
5345 Armada Drive
Carlsbad, California 92008
Telephone: (800) 421-7250 or (760) 603-4000

American Gem Society Laboratories (AGSL)

The American Gem Society Laboratories (AGSL) is a not-for-profit trade association founded 65 years ago in 1934 by Robert M. Shipley. The AGSL mission is "a dedication to proven ethics, gemological knowledge, and consumer protection." AGSL membership includes 900 retail firms in North America representing 1400 stores, and 200 wholesale suppliers, and sustaining firms.

Each AGSL member firm must meet strict criteria to obtain membership including: a minimum of 2 years in business, dealing in the retail or wholesale trade (not both), and having at least one staff member with gemological training. In addition AGSL member firms are committed to truth in advertising and pricing, therefore accurately representing all products and services to their customers.

Every AGSL member firm must have an AGSL titleholder, one who has taken the "AGSL Way Course" covering a variety of topics including the AGSL Diamond Grading Standards. Each year every AGS titleholder must take a recertification exam to maintain their membership. Any issue concerning an AGSL member firm is resolved through a grievance and review process, again ensuring consumer protection, promoting confidence and trust.

The AGSL can be reached at:
American Gem Society Laboratories (AGSL)
8917 West Sahara Avenue
Las Vegas, Nevada 89117
Telephone: (702) 233-6120

Northwest Gemological Laboratory, Inc.

Northwest Gemological Laboratory, Inc. is a scientific, state-of-the-art gemological facility based in Bellevue, Washington. NGL has offered the legal, insurance, and jewelry industries accurate and detailed fine jewelry appraisals since 1978. NGL is dedicated to providing the highest quality service and does not buy or sell jewelry.

NGL appraisers have completed Graduate Gemologist training from the Gemological Institute of America (GIA). NGL appraisers have extensive knowledge of appraisal ethics and theory and a thorough understanding of the gemstone market.

NGL can be reached at:
Northwest Gemological Laboratory, Inc.
10801 Main Street, #105
Bellevue, Washington 98004
Telephone: (425) 454-5633 or (425) 455-0985
Fax: (425) 454-3088

International Gemological Institute (IGI)

International Gemological Institute (IGI) is one of the world's largest independent gem certification and appraisal institutes, with laboratories in Antwerp, New York, and Bangkok. IGI serves jewelers, retail stores, insurance companies, Internet sales organizations, catalog companies, accounting and securities firms and consumers worldwide. With a professional staff of 200, IGI issues more than 200,000 reports a year.

IGI can be reached at:
579 Fifth Avenue
New York, NY 10017-USA
Telephone: (212) 753-7100
Fax: (212) 753-7759

Independent Gemological Laboratories, Inc. (IGL)

All Independent Gemological Laboratories, Inc. (IGL) appraisers are graduates of the Gemological Institute of America with graduate degrees in gemology. As a leader in appraisals ethics and theory, the qualified IGL appraisal staff has years of experience in jewelry manufacture and appraisal practice. In IGL's modern facilities, gemologists perform a wide variety of diamond certification grading practices using tools exclusive to their processes.

IGL can be reached at:
Independent Gemological Laboratories, Inc.
21 West 38th Street, 9th Floor
New York, N.Y.
Telephone: (212) 557-0111

American Gemological Laboratories

Gem Sciences and Country of Origin Specialist

AGL can be reached at:
580 Fifth Avenue
Suite 706
New York, New York 10038
Tel: 212-704-0727 Fax: 212-764-7614

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