Today, most fine diamonds are carefully evaluated prior to being set, by a respected laboratory such as the Gemological Institute of America (GIA) and European Gemological Laboratory (EGL).
The diamond grading report, or “certificate” certifies the diamond as genuine and describes it in detail, providing important information such as color grade, clarity grade, carat weight, measurements, cutting, proportions, symmetry, and polish.
Most loose diamonds sold by IDC have been analyzed and graded by either the Gemological Institute of America (GIA) or the European Gemological Laboratory (EGL). IDC works with these independent laboratories, as they are some of the most respected laboratories in the diamond industry. These two laboratories are known for having the strictest, consistent, and unbiased systems for grading diamonds. Diamonds that are accompanied by these grading reports are the most highly valued in the industrydue to the laboratories superior reputations.
Grading Report
GIA set the standard for diamond grading and
gemological identification, and their grading system
serves as the international gem and jewelry industry’s
benchmark credentials.
This report describes the following:
Shape and Cutting Style – The diamond shape and cutting
style
Measurement- The diamond dimensions in millimeters
Weight – Weight of diamond listed to the nearest
hundredth of a carat
Depth – Depth in millimeters divided by width in millimeters.
Table – The measurement of the table facet divided by the diameter in millimeters.
Girdle – Range of girdle thickness
Culet – Appearance of culet facet
Finish – Grades of polish and symmetry
Clarity – Clarity grade determined under 10x
magnification
Clarity Plot – A map of the approximate size, type, and
position of inclusions as viewed under a microscope
Color – Grade of color
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