the-tiffany-guide-to-diamonds-clarity

Diamond inclusions are internal flaws. Tiffany rejects any diamond with noticeable imperfections to the unaided eye.

FL diamonds are Flawless

IF diamonds are Internally Flawless

VVS diamonds (1 and 2) are Very, Very Slightly Included

VS diamonds (1 and 2) are Very Slightly Included

SI diamonds (1 and 2) are Slightly Included

I diamonds (1, 2 and 3) are Imperfect

The gemological standards in this section refer only to individually registered engagement diamonds set in certain ring styles.

Tiffany’s strict diamond grading standards are executed with expertise, integrity and accuracy. When Tiffany believes that a diamond’s clarity is on the borderline between two grades, Tiffany will always assign the stone a lower grade—never falsely inflating a diamond clarity grade.