Our Diamond Prices Comparison chart demonstrates some of the differences in prices based on the Four Cs of diamonds.While based on "real" diamond prices, this chart is for demonstration purposes only and is not intended to guarantee prices from any diamond … This chart summarizes the main concepts of the GIA Cut Grading System for round brilliant diamonds that was introduced by the GIA Laboratory in January 2006. To get a “0-cut” grade, the diamond had to have specifications falling in the following ranges: The following chart shows the old AGS cut grade parameters for round brilliant diamonds. For round diamonds, stick to Excellent cut. This simplified evaluation chart of diamond quality, summarizes "The 4 Cs" of diamond quality grading, which determine value.. - The chart summarizes the evaluation factors of Carat, Cut, Color, and Clarity, and lists the other factors that determine a diamond's value.. GIA Cut Grade Estimation Tables for Standard Round Brilliant Cut Diamond Explains how to locate a particular proportion combination, and determine whether it is close to a boundary in the cut grading system. GIA only rates round diamonds, with the highest possible grade being Excellent. Round Cut Diamonds: For Round Cut diamonds under 1 Carat, a VS2 or SI1 clarity grade will give you an eye-clean diamond (sometimes even SI2 doesn’t have visible inclsuions). A perfect cut equals more sparkle and … In this video you'll get everything you need to know about diamond cut grade explained, and how it pertains to the "4C's" of diamonds developed by the GIA. 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. Grading Diamond Cut. Each skillfully cut facet serves a purpose and contributes to the essential characteristics that are the key elements to light performance and the final grade. The diamonds must fall into the GIA D-Z color range. GIA diamond cut grading is based on girdle thickness, finish and culet size. A diamond cut is a style or design guide used when shaping a diamond for polishing such as the brilliant cut.Cut does not refer to shape (pear, oval), but the symmetry, proportioning and polish of a diamond. It also discusses how to use Facetware online to obtain a more accurate estimate of a cut grade. 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. By Robert Underhill. The radiant cut diamond is the first rectangular cut to have a complete brilliant facet pattern.Because of its design, this cut requires more weight to be directed toward the diamond's depth in order to maximize brilliance. Diamond Clarity Grade Chart: FL (Flawless). Very Good grade round diamonds will also offer excellent brilliance and sparkle. However, a “Tolkowsky Cut” is a very specifically calculated cut with the following parameters: Table 53.0%, Crown Angle 34.6, Crown Height 16.2%, Girdle Thickness app 1.7%, Pavilion Depth 43.1%. Cut grades, however, aren't universal. Below is a diamond chart with a rating system that will help you to evaluate stones of specific color and diamond clarity combinations. Lab: American Gem Society : Cut > Cut "0" Cut "1" Cut "2" Cut "3" Diamond cut grade refers to cut quality in a GIA diamond. Every diamond, like a human fingerprint, has certain distinguishing characteristics. This cut quality grade is only for standard round brilliant diamonds. 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