FL – Flawless Flawless diamonds have no inclusions or blemishes detectable under 10x magnification, and are extremely rare.
IF – Internally Flawless Internally Flawless diamonds have no inclusions and only blemishes are visible to a skilled grader using 10x magnification.
VVS1/VVS2 – Very, Very Slightly Included Very, Very Slightly Included diamonds have minute inclusions that range from extremely difficult to very difficult to see are visible to a skilled grader using 10x magnification.
VS1/VS2 – Very Slightly Included Very Slightly Included diamonds have minor inclusions that range from difficult to somewhat easy to see are visible to a skilled grader using 10x magnification.
S1/S2 – Slightly Included Slightly Included diamonds have noticeable inclusions that range from easy to very easy to see are visible to a skilled grader using 10x magnification.
I1/I2/I3 – Included Included diamonds have obvious inclusions that are visible to a skilled grader using 10x magnification and may affect transparency and brilliance.