Clarity

Practically all diamonds contain naturally occurring internal characteristics called inclusions. The size, nature, location and amount of inclusions determine a diamond's clarity grade and affect its cost.

Flawless, Internally Flawless Diamond Clarity FL-IF No inclusions visible (by an expert) under 10x
magnification. (FL=Flawless, IF=Internally Flawless.)
Very, Very Slight Inclusions in Diamond Clarity VVS1-VVS2 Minute, extremely difficult to find under 10x
magnification. (VVS=Very, very slight inclusions.)
Very Slight Inclusions in Diamond Clarity VS1-VS2 Minor, difficult to find under 10x magnification.
(VS-Very light inclusions.)
Small Inclusions in Diamond Clarity SI1-SI2
 Noticeable, relatively easy-to-find under 10x
magnification. (SI=Small inclusions.)
Imperfect Diamond Clarity I1-I2 Obvious under 10x magnification. Just visible to the
naked eye. (I1=imperfect.)

Diamond Clarity Grading Scale