Diamond clarity is a measure of the purity and rarity of the stone, graded by the visibility of these characteristics under 10-power magnification. A stone is graded as flawless if, under 10-power magnification, no inclusions (internal flaws) and no blemishes (external imperfections) are visible.
FL
FL diamonds are Flawless
IF
IF diamonds are Internally Flawless
VVS1 VVS2
VVS diamonds (1 and 2) are Very, Very Slightly Included
VS1 VS2
VS diamonds (1 and 2) are Very Slightly Included
SI1 SI2
SI diamonds (1 and 2) are Slightly Included
I1 I2 I3
I diamonds (1, 2 and 3) are Imperfect
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