Home Diamonds AGS Diamond Grading System

AGS Diamond Grading System

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.

In the American Gem Society Diamond Grading Standards, this would be known as the famed Triple Zero® or Triple 000.

Cut Scale Cut Scale

Color Scale 
Color Scale

Clarity Scale

Find an AGS Jeweler or learn more about diamonds.

Signup for our Newsletter

The Latest News

American Gem Society Appoints New President of the Board and Announces 2016 Board of Directors
  FOR IMMEDIATE RELEASE   American Gem Society Appoints New President of the Boardand Announces 2016 Board of Directors  Las Vegas, NV (April 18,...
Latest Facebook Post:
When you see an “RJ” title after a jeweler’s name, it means they are an American Gem Society Registered Jeweler. In order to earn this title, the associate...