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GIA Diamond Dossiers

Independent Gemological Laboratories

While you browse our site, you will notice we refer to independent gemological laboratories that analyze and grade the diamonds we sell. This page contains some background information about these laboratories, including how to contact them if you'd like to learn more about what they do.

Gemological Institute of America (GIA)

For over 75 years, the Gemological Institute of America (GIA) has been recognized the world over for its authoritative diamond grading and unbiased, reliable service. The GIA laboratories were founded on innovative scientific research and education in the field of gemology, and they continue to serve as world-leaders in diamond grading and identification. When your diamond has been studied and graded by the GIA, you can trust that their analysis is honest and trustworthy.

Contact the GIA as follows:
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
Website: www.gia.edu

American Gem Society Laboratories (AGSL)

In 1996, the American Gem Society, which was founded in 1934, joined with a group of investors to form the American Gem Society Laboratories (AGSL). They bring years of experience to the diamond grading industry and strive to offer consumers accurate, unbiased diamond analysis. The AGSL is comprised of a network of member laboratories that must adhere to rigorous training requirements and uncompromising standards. Only laboratories of the highest ethical standards and professional qualifications are deemed worthy to carry the AGS patronage; making the AGSL a trusted body within the diamond retail industry and among the gem buying public.

Contact the AGS and AGSL as follows:

American Gem Society Laboratories (AGSL)
Telephone: (702) 233-6120
Website: www.ags.org

American Gem Society (AGS)
8881 West Sahara Avenue
Las Vegas, Nevada 89117
Telephone: (702) 255-6500
Website: www.agslab.com 


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