Cut Grading Diamond

A description of its shape and cutting style.

Cut grading diamond. American gem society taking cut grading to a higher level. Non standard round brilliant cut diamonds. As a diamond deviates further from having ideal light performance so does the numerical grading value as it starts increasing from 1 excellent 2 very good. Each of the four c s carat weight cut color clarity is accompanied by a diamond chart illustrating the differences between grades.

There are three factors that determine a diamond s cut. But reports do contain an assessment of the diamond s polish and symmetry. Cut estimator enter a round diamond s table crown angle and pavilion angle to see how it would be scored based on the gia and ags proportion based cut grading systems. And of all the diamond 4cs it is the most complex and technically difficult to analyze.

At this time an overall cut grade for non standard round brilliant diamonds or fancy shaped diamonds such as rectangular oval or square is not available on gia grading reports. The best cut diamonds will sit in the intersection between gia excellent and ags ideal. For example this 1 01 carat vs1 clarity h color radiant cut diamond from james allen costs 3 300. This rare cut represents roughly the top 3 of diamond cut quality it reflects most of the light that enters the diamond.

Cut is the only one of the 4cs that is affected by human hands. Fortunately all of these factors have already been taken into consideration. To determine the cut grade of the standard round brilliant diamond the shape that dominates the majority of diamond jewelry gia calculates the proportions of those facets that influence the diamond s face up appearance. And a simplified proportion.

This cut represents roughly the top 15 of diamond cut quality it reflects nearly as much light as the ideal cut but for a lower price. Excellent very good and good gia cut grades evaluating the combined effects of facet shapes and angles girdle width culet size polish and symmetry on the overall appearance of a diamond is a daunting task even for professional gemologists. Ags diamond quality document ags was the first independent grading organization to utilize a numerical system in their reports with 0 being the highest grade. By choosing a radiant cut over a round.

Two diamonds may have the same clarity color and carat weight but cut is what determines whether or not one is superior to the other. Here you will learn how gia diamond grades are established and how those grades affect the diamond s price. The gia diamond cut grading system most of the diamonds industry follows a cut scaling system that was created by the gia gemological institute of america a non profit organization which rates the diamond s cut with the following grades from best to worst. Every diamond certified by the gia undergoes a thorough independent evaluation.

Put simply cut is responsible for the quality and degree of a diamond s sparkle.