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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 10 is the lowest.

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 more rare; therefore, they may cost more on the retail market.

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: 0/0/01.000 carat.

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

Clarity Scale
Clarity Scale
Color Scale
Color Scale
Cut ScaleCut Scale