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