The AGS 0–10 diamond grading chart 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. Natural diamonds having less color are rarer; therefore, they may cost more.
When writing the grades of a diamond using AGS diamond scales, 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.
The AGS diamond cut scale measures how well a diamond reflects light. Higher grades indicate better brilliance and fire.
This diamond color scale shows what color each diamond can be.
| AGS | 0.0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | 6.0 | 6.5 | 7.0 | 7.5 | 8.0 | 8.5 | 9.0 | 9.5 | 10.0 | To Fancy Yellow | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Colorless | Near Colorless | Faint | Very Light | Light | Fancy Yellow | ||||||||||||||||||||||
| Industry | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Fancy Yellow | |||
This diamond clarity chart shows both a visual and numerical display of how flawless or included a diamond can present as.
| AGS | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grade | Flawless/IF | Very Very Slightly Included | Very Slightly Included | Slightly Included | Included | |||||||||||||||||
| GIA | Flawless/IF | VVS1 | VVS2 | VS1 | VS2 | SI1 | SI2 | I1 | I2 | I3 | ||||||||||||
Want to go beyond diamond classification? Take a closer look into the history of diamonds or find a jeweler near you.
