FL (flawless)
IF (internally flawless)
VVS1 (extremely difficult to see under 10x)
VVS2 (very difficult to see under 10x)
VS1 (difficult at 10X)
VS2 (somewhat easy at 10X)
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SI1 (easy at 10x)
SI2 (very easy at 10x)
I1 (obvious at 10x, generally not eye clean)
I2 (obvious at 10x, not eye clean)
I3 (very obvious at 10x, not eye clean)
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