DIAMOND EDUCATION

EGL Diamond Certification

Origins
The European Gemological Laboratory (EGL) was founded in Belgium more than 30 years ago. In 1977, the EGL established its North American headquarters in New York City. The EGL is credited with introducing new approaches to grading diamonds, including the grading of diamonds less than one carat in size. In 1997, EGL unveiled the "SI3" designation for grading diamond clarity, a standard that the world diamond community has come to embrace. Thanks to its commitment to gemological excellence and more than a quarter century of experience, the EGL is one of the world’s most prestigious laboratories.

EGL Diamond Grading Report

Methodology
An EGL grading report is based on thorough scrutiny of every facet and detail of the diamond being considered. Each diamond passes through the hands of at least eight professionals, four of whom are trained gemologists.

• Weight and measurement are recorded, and culet and girdle thickness are noted.
• Color is graded in scientifically calibrated lighting conditions, and the stone is compared to a set of master diamonds with known color grades. Three color graders must agree before the diamond is assigned a color grade.
• Clarity is determined by graders who use a zoom binocular microscope to inspect every facet of the diamond for inclusions (internal) and blemishes (external) that could affect clarity. Locations of inclusions are plotted on a diamond diagram.
• Polish and symmetry are graded based on a careful inspection of the diamond’s cut finish.

View an example of the EGL Diamond Grading Report.

Cut Grade
The EGL evaluates the cut grade of a diamond based on a meticulous examination of the stone’s proportions and cut. Polish and symmetry as well as a diamond’s ability to exude brilliance are considered in determining cut grade.

EGL USA
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New York, New York 10036
www.eglusa.com