IGI Diamond Certification
Origins
The International Gemological Institute (IGI), established in 1975 in Antwerp
and New York, is one of the world's leading gemological institutions. Thanks to
the IGI's reputation for integrity, accuracy, and reliability, hundreds of
thousands of diamonds pass through this laboratory's halls each year. In 1982,
the IGI answered the growing demand for education, when it became the world's
first gemological institute to offer courses in rough and polished diamonds.
IGI has bases of operations in eight vital industry locations throughout the
world.
IGI Grading Report
Methodology
Each diamond graded by the IGI is scientifically analyzed by several graduate
gemologists. These experts team their knowledge and experience with
state-of-the-art equipment to prepare an accurate description of each diamond.
All gemologists must agree on each diamond before a grading report can be
issued.
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Weight is determined using an electronic balance that measures to
ten-thousandth of a carat.
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Measurements are taken, and every angle and facet is measured to evaluate
polish and symmetry.
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Clarity is graded by determining the number, nature, size, and position of any
internal characteristics. This analysis is performed by means of a high-powered
microscope and a 10x magnification loupe.
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Color is described by comparing the diamond to a set of master stones of
predetermined hue.
View an example of the
IGI Grading Report.
Cut Grade
Diamonds that receive the IGI's ideal cut designation are striking in their
precision and thus bear clear witness to the cutter's skill. Diamonds that meet
the IGI's rigorous criteria typically retain little of their rough weight,
require considerable time to make, and display abundant brilliance.
IGI - New York
589 Fifth Avenue
New York, New York 10017
www.igiworldwide.com
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