A diamond certificate, also known as a diamond grading report, is an easily understood document prepared by an expert gemologist that describes the key characteristics of a diamond. A certificate from a gemological laboratory verifies the quality of a loose diamond and allows non-experts to make educated diamond buying decisions.
Gemological Institute of America (GIA)
Founded in 1931, the Gemological Institute of America (GIA) is an independent, non-profit organization widely considered as the world's foremost authority in gemology. Introduced in 1953, their diamond and gemstone grading system is recognized as an accepted standard worldwide. Gemstone manufacturers from around the globe send diamonds and gems to the GIA for expert examination and analysis.
The GIA's mission is to increase consumers' trust in diamonds and jewelry by upholding the highest standards of integrity, academics, science, and professionalism. They work toward this goal by providing jeweler and consumer education, conducting meticulous research, and developing state-of-the-art laboratory instruments for diamond inspections.
GIA Diamond Grading
The GIA Diamond Grading Report is issued for diamonds that fall in the D-Z color range. This detailed report includes a full quality analysis of shape and cutting style, measurements, carat weight, color grade, clarity grade, cut grade (for brilliant round-cut diamonds), polish and symmetry assessments, and fluorescence. The report also includes a plotted diagram indicating the relative size and location of clarity characteristics, a proportion diagram, and GIA grading scales.
GIA Diamond Dossier
The GIA Diamond Dossier® is issued for diamonds between 0.15 and 1.99 carats that fall in the D-Z color range. This report includes all of the information featured in the Diamond Grading Report without a plotted diagram. All diamonds accompanied by a Diamond Dossier are laser inscribed and registered in the GIA inscription registry.
Contact the Gemological Institute of America (GIA)
5355 Armada Drive
Carlsbad, California 92008
Toll-Free: 800-421-7250
International Gemological Institute (IGI)

Contact the International Gemological Institute (IGI)
IGI New York
589 Fifth AvenueNew York, NY 10017
Phone: 212-753-7100
Fax: 212-753-7759
www.igi-usa.com
IGI Belgium (World Headquarters)
Schupstraat 12018 Antwerp
Belgium
Phone: +32 3 401 08 88
Fax: +32 3 232 07 58
www.igiworldwide.com
American Gem Society (AGS)

In 1996, the AGS established a laboratory to provide modern gemstone grading services for the diamond marketplace. Its conservative, thorough approach to diamond grading has made the AGS one of the world's most respected gemological laboratories.
Contact the American Gem Society (AGS)
8917 West Sahara Avenue
Las Vegas, Nevada 89117
Phone: 702-233-6120
Fax: 702-233-6125
European Gemological Laboratory (EGL)

An EGL certificate is a valued document that aids consumers in the diamond buying process and is the result of thorough scrutiny of a diamond.
Contact the European Gemological Laboratory (EGL)
EGL USA
6 West 48th Street
New York, New York 10036
Phone: 212-730-7380
Fax: 212-842-5180
Contact the European Gemological Laboratory (EGL)
23 Tuval St.
Ramat Gan, Israel 52522
Toll-Free: 888-454-6818
Phone: +972 3-752-8428
Fax: +972 3-751-0047
Hoge Raad Voor Diamant (HRD)

The HRD's mission is to develop Antwerp as a world diamond center by representing the diamond sector in Belgium and abroad to public governments and diamond organizations. Furthermore, they also strive to increase industry knowledge by conducting thorough research in manufacturing and trade efficiency.
Contact the Hoge Raad voor Diamant (HRD)
Hoveniersstraat 22
BE-2018 Antwerp
Belgium
Phone: +32 (0)3 222 06 11
Fax: +32 (0)3 222 06 99
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