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The Argyle Grading Method. It shouldn’t come as too much of a surprise that the Argyle mine, which has managed to become the leading name in pink diamonds as a result of their brilliant branding as well as their incredible products, is responsible for creating a diamond grading system of their own. The 4 Cs of diamond quality are the universally recognized diamond grading system still in use today. In 1955, GIA presented its first diamond grading reports, which became the hallmark of grading reports in the diamond industry. In the 1950s, the GIA worked alongside De Beers to attract interest in the 4 Cs. While 35% of the diamond market is made up of fair or poor cuts, Blue Nile does not offer them.

Every diamond certified by the GIA undergoes a thorough, independent evaluation. Here you will learn how GIA diamond grades are established, and how those grades affect the diamond's price. Each of the four C's (Carat Weight, Cut, Color, Clarity) is accompanied by a diamond chart illustrating the differences between grades. This scale ranges from D through Z for white diamonds, while fancy colored diamonds have their own separate grading scale. The categories of the white diamond color scale are as follows: Colorless- (D, E, F) There are slight differences between these three grades, but they can only be determined by a gemologist. Such diamonds have enough color to be considered “fancy,” along with pink, green, and blue diamonds.

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All GSI grading reports are backed by GSI’s commitment to the highest ethical standards. This diamond buying guide shows you how GIA diamond grading certification works. Learn about 4c’s of diamonds, diamond clarity scale, diamond color grade, an Answer: Those letters and numbers are the Gemological Institute of America’s (GIA) gem clarity grading codes.
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This range is known as the diamond clarity scale. It was created by GIA and is the industry wide standard for diamond grading and comparison. This diamond clarity rating is the one that is most respected for accuracy and consistency.
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One of the “four C’s” in diamond grading. There are several color grading scales used throughout the world, the scale used in this report is that of the GIA. The range is from colorless (“D”) to yellow, brown or grey (“Z”), beyond is termed Fancy. The Gemological Institute of America (GIA) color scale is the industry standard for diamond grading. The GIA diamond color grades range from D (colorless) to Z (light yellow or brown). Many people ask why the GIA diamond grading scale starts at D. Arcane systems used grades of A-C, 1-3, and I-III, etc.