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Gemological Institute of America (GIA)
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GIA to Upgrade Diamond Cut Report on July 1

From: "GIA" > "GIA cut grades" > By Jeanette Goldman Posted: 7/1/2006 found at (Rapaport...July 1, 2006)

The Gemological Institute of America (GIA) will update the wording and the placement of “brillianteering” comments on its Diamond Grading Report and Diamond Dossier® for standard round brilliant diamonds beginning July 1, 2006.

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In a statement issued on June 30, the GIA announced it will also provide a free re-issue service that will be available for a three-month period, also beginning July 1. The service will apply only to reports that have the original brillianteering comment.

GIA’s new Diamond Grading Report and Diamond Dossier®, introduced nearly seven months ago, in January 2006, indicated when a diamond’s cut grade was affected by painting or digging out by putting a notation within the report’s comments section that read: Cut grade is based on brillianteering of the half-facets.

Starting July 1, a similar diamond will have a statement located under the proportion diagram –-not in the comments section-– that reads: Cut grade affected by brillianteering.

“We’re changing the language and location of the brillianteering comment on these reports so that all of the important information is included, while making sure that it is presented in a clear and understandable format to the consumer,” said Tom Moses, senior vice president, GIA Laboratory and Research.

Brillianteering refers to the last steps of the polishing process when the star facets along with the upper and lower half facets (also known as upper and lower girdle facets) are polished on the diamond. When a diamond is painted or dug out, these facets are polished in a manner that can affect the face-up appearance of the diamond and therefore may affect the final cut grade.

The New GIA Diamond Cut Grade Is Here.

GIA (Gemologocal Institute of America) the foremost diamond grading laboratory in the world has introduced as of January 3, 2006 their new Cut grade for round brilliant shape diamonds.

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The New GIA Diamond Grading Report.

Based on fifteen years of meticulous research and over 70,000 human observations of diamonds of varying Cut qualities, GIA has been able to assess the 58 facets that comprise the most popular and most sold round brilliant shape diamond and define it's Cut quality along the lines of "Excellent", "Very Good", "Good", "Fair", and "Poor."

The graph below depicts the round diamond facets that GIA analyzed to arrive at their Cut Grade System.

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Critical facets that comprise the round brilliant shape diamond. Maximizing a diamond's brilliance, dispersion, and scintillation depends on the correct facet size, facet angle, and facet alignment of all the 58 facets working in unison. GIA's Cut Grade distills all of this into an easy to understand Cut Grade.

Below are the measurements of various facets that go into determining the Cut Grade.

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