| IF | internally flawless | no inclusions at 10x magnification |
| VVS1/VVS2 | very very slightly included | minimal inclusions, difficult to detect at 10x magnification |
| VS1/VS2 | very slightly included | very slight inclusions very small inclusions, difficult to detect at 10x magnification |
| SI1/SI2/SI3 | slightly included | slight inclusions small inclusions, easily visible at 10x magnification |
| P1/P2/P3 | piqué | inclusions visible to the naked eye |