The following tables show the AGA Cut Grading system for various diamond cuts developed by D. S. Atlas and his laboratory Accredited Gem Appraisers.
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Diamond Grading & Gemological Reports
There are a variety of Gemological Institutes that appraise, measure
and certify loose diamonds and diamond jewelry. Depending on your
region, there are a number of reputable companies including the
following listed below.
HRD – Hoge Raad Voor Diamant (The Diamond High Council). The
officially recognised representative of the Belgium diamond trade
and industry. HRD headquarters are located in Antwerp, World Diamond
Center.
GIA – Gemological Institute of America. Founded in 1931 in Los
Angeles, the GIA created and introduced the international grading
system. Headquarters are still located in Los Angeles.
IGI – International Gemmological Institute. The oldest institute of
its kind in Antwerp. Set up in 1975 with labs in New York, Bangkok,
Mumbai and Tokyo.
GemScan – GemScan International was incorporated in 1985 as an
independent jewellery appraisal laboratory providing gem
identification. Gemscan is based in Toronto, Ontario Canada.
AGS – American Gem Society Founded in 1934 by Robert M. Shipley who
also founded the GIA. The AGS is based in Nevada, USA.
EGL – European Gemological Laboratory. EGL was originally opened in
Antwerp in 1974, and now has laboratories in Antwerp, New York Los
Angeles, Johannesburg, Paris, London, Israel and Seoul.