Flawless
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FL: Diamond free from internal and external flaws under 10X magnification.

Internally Flawless
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IF: Absolutely free from internal faults under 10X magnification. May contain external features that should be so small that they can easily be removed by polishing.

Very Very Slightly Included
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VVS1: Very, very small inclusions in the stone, very difficult to recognize under 10X magnification. These inclusions can not be in the field of the table.

VVS2: Very, very small inclusions anywhere in the stone, only smallest external defects allowed.

Very Slightly Included
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VS1: Only the smallest inclusions are allowable in the field of the table and only small faults elsewhere in the stone.

VS2: Very small internal faults. Small external defects.

Slightly Included
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SI1: Small internal faults, not visible to the naked eye.

SI2: Small, easily seen inclusions under magnification in the table, but still not visible to the naked eye.

Included
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1: Inclusions easily seen under magnification, but difficult to see with the naked eye. Inclusions do not influence brilliance.

2: Large and numerous inclusions, just barely visible to the naked eye through the crown. Inclusions slightly diminish brilliance.

3: Large and numerous inclusions, easily visible to the naked eye, diminishing brilliance.