· F-IF
Flawless or Internally Flawless. No internal inclusions. Very rare.

· VVS1-VVS2
Very Very Slightly Included. Minute inclusions very difficult to detect under 10x magnification.

· VS1-VS2
Very Slightly Included. Minor inclusions invisible to the naked eye and seen only with difficulty under 10x magnification.

· SI1-SI2-SI3
Slightly Included. Noticeable inclusions very difficult to detect under 10x magnification.

· I1-I2-I3
Included. Inclusions visible under 10x magnification as well as to the human eye.

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