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.
Cut grading diamond.
In fact the radiant cut diamond is one of the most affordable diamond shapes.
Blue nile offers four different cut grades ideal.
Fortunately all of these factors have already been taken into consideration.
Here you will learn how gia diamond grades are established and how those grades affect the diamond s price.
By choosing a radiant cut over a round.
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.
Meanwhile this round brilliant cut diamond of the same clarity color and carat weight costs 5 240 almost 40 more.
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.
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.
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.
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.
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.
For example this 1 01 carat vs1 clarity h color radiant cut diamond from james allen costs 3 300.
Put simply cut is responsible for the quality and degree of a diamond s sparkle.
Every diamond certified by the gia undergoes a thorough independent evaluation.
Cut is the only one of the 4cs that is affected by human hands.
There are three factors that determine a diamond s cut.
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.
Each of the four c s carat weight cut color clarity is accompanied by a diamond chart illustrating the differences between grades.
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.
The best cut diamonds will sit in the intersection between gia excellent and ags ideal.
And a simplified proportion.
And of all the diamond 4cs it is the most complex and technically difficult to analyze.
A description of its shape and cutting style.
American gem society taking cut grading to a higher level.
