The AGS diamond grading system is easy to understand. Learn more and find a local certified jeweler at AmericanGemSociety.org. Jewelry Association | Top Jewelers, Diamond Education
AGS Diamond Grading System
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The AGS 010 Diamond Grading System

Diamond in a loupe

The AGS 0–10 grading scale is easy to understand: the highest possible grade is zero, and the lowest is 10.

Easy, huh?

So, a diamond with a color grade of 3 has less color than a diamond with a color grade of 5. Diamonds having less color are rarer; therefore, they may cost more.

When writing the grades of a diamond using the AGS Scale, diamond Cut grade is first, then diamond Color, Clarity, then Carat Weight—in that order.

If a diamond possessing the finest diamond Cut grade is also colorless, free of inclusions and blemishes, and weighs one carat, it would be written as: 0/0/0–1.000 carat.

Cut Scale
Cut Scale

Color Scale 
Color Scale

Clarity Scale

Find an AGS Jeweler or learn more about diamonds.

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Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

American Gem Society

8881 W. Sahara Ave. Las Vegas, NV 89117

info@ags.org (866) 805-6500