| D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S-Z | Z+ |
| COLORLESS | NEAR COLORLESS | FAINT YELLOW | VERY LIGHT YELLOW | LIGHT YELLOW | FANCY | |||||||||||
| Stones in these grades will "face up" colorless (i.e., slight traces of color not apparent in mounted stones to other than the trained eye). | Small Stones in this range will "face up" colorless when mounted, but larger ones will be tinted. | Mounted stones in these grades will display a yellowish tint even to the untrained eye. | ||||||||||||||
| FL | IF | WS1 | WS2 | VS1 | VS2 |
| FLAWLESS-Free from all inclusions or blemishes at 10x magnification. | INTERNALLY FLAWLESS- No inclusions visible at 10x magnification. Insignificant surface blemishes only. | Extremely minute inclusions visible only from the pavilion side, making it very difficult to locate by a skilled observer at 10x magnification. | Extremely minute inclusions difficult to locate by a skilled observer at 10x magnification. | Minor inclusions very difficult to see by a skilled observer at 10x magnification. | Minor inclusions somewhat difficult to see at 10x magnification. |
| SI1 | SI2 | I1 | I2 | I3 |
| Noticeable inclusions easy to see at 10x magnification, but not visible to the unaided eye. | Noticeable inclusions very easy to see at 10x magnification and perhaps visible through the pavilion by the unaided eye. | Obvious inclusions at 10x magnification barely detectable to the unaided eye. | Obvious inclusions easily visible to the unaided eye. | Prominent inclusions extremely easy to see with the unaided eye usually affecting the durability of the diamond. |
| Store | Size | Color | Cut | Clarity | Cost |