F: Flawless: contain no internal or external inclusions under 10 times magnification
IF: Internally Flawless: contain insignificant surface imperfections, but no internal inclusions
VVS1-VVS2: Very, Very Slightly Included: inclusions are extremely difficult to find under 10 times magnification.
VS1-VS2: Very Slightly Included: inclusions are difficult to see under 10 times magnification and appear 100% clean to the naked eye.
SI1-SI2: Slightly Included: noticeable inclusions that are easily found under a 10 times magnification.
I1-I2: Included: contain obvious inclusions under 10 times magnification and can be seen with an unaided eye.
I3: Included: contain noticeable internal and external inclusions which are easily seen by an untrained eye.

A diamonds clarity is determined by the number, location, and intensity of inclusions such as crystals, clouds, or feathers it contains. Inclusions, naturally occurring imperfections, can be viewed under a 10 times magnification. The fewer the inclusions, the more valuable the stone. A well cut diamond can minimize the appearance of inclusions.

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