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You should always request a diamond grading report—also known as a certificate—for
diamonds over one carat. This report documents the diamond’s unique characteristics.
Issued by an independent gemological laboratory, the report examines and identifies
the 4Cs—color, clarity, carat weight and cut — along with finish, fluorescence and
symmetry. In addition to cut, some reports also grade the light performance on the
diamond. The report will include a diagram of all the inclusions unique to the stone.
In some cases, the diamond can be laser-inscribed with the number of the report to ensure
future identification.
Some gemological laboratories that issue diamond grading reports in the United States include:
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American Gem Society (AGS) 702.233.6120
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European Gemological Laboratory (EGL) 212.730.7380
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Gem Certification and Assurance Lab (GCAL) 212.869.8985
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Gemological Institute of America (GIA) 212.221.5858; 800.421.7250
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International Gemological Institute (IGI) 212.753.7000
A grading report is not the same as an appraisal, which is done after you purchase
the diamond and helps you to verify the v
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