The clarity of a diamond is refering to the amount of imperfection, or not, within or externally on a stone. The less imperfections the better the stone. 

GIA clarity’s are listed as follows:

FL. Flawless

IF. Internally Flawless

VVS1, VVS2. Very, Very Slighly included

VS1, VS1. Very Slighly included

S1, S1. Slighlty Included.

I1, I2, I3. Included.


All of the above are to a X10 loup magnification.

For more detailed information please go to the official GIA website.