F
IF
VVS
VS
SI
I
F
Flawless
No inclusions or blemishes are visible to a skilled grader.
IF
Internally Flawless
No inclusions and only minor surface blemishes.
VVS
Very Very Slightly Included
Inclusions extremely difficult to detect.
VS
Very Slightly Included
Minor inclusions visible under magnification.
SI
Slightly Included
Noticeable inclusions under magnification.
I
Included
Obvious inclusions affecting brilliance.
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