| Flawless – Free from internal and external characteristics under x 10 magnification. |
| Internally Flawless– Free from internal characteristics, possesses external characteristics under x 10 magnification. |
| VVS1 – VVS2 – Very, very small inclusion or inclusions, extremely hard to find under x 10 magnification. |
| VS1 – VS2 - Very small inclusions, difficult to find under x 10 magnification. |
| SI1 – SI2 – Small inclusions, relatively easy to find under x 10 magnification, generally not visible to the naked eye through the top of the stone. International grading has been more relaxed on SI2 stones in the recent past and some inclusions can be seen with the naked eye. |
P1 – P3 (Piqué). Inclusions visible with the naked eye. Ranging from inclusions difficult to see through the top of the stone, to numerous inclusions easily visible. This reduces the brilliancy of the diamond.
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