FL-IF: "FL"=Flawless: No internal or external flaws. A completely unblemished diamond. "IF"=Internally Flawless: No internal flaws. This diamond may have negligible scratches on the outside, but is completely flawless on the inside. Diamonds of both these grades are extremely rare.

VVS1-2: Very, Very Slightly Included. A VVS1 grade is slightly better than a VVS2 grade. These are the finest clarity grades found in most jewelry stores. Diamonds in these clarity grades have outstanding fire and brilliance.

VS1-2: Very Slightly Included. A VS1 grade is slightly better than a VS2 grade. These diamonds have inclusions that are typically not visible to the unaided eye, and much lower price points than higher grades of clarity. Diamonds in these clarity grades can offer the best diamond value.

SI1-2: Slightly Included. An SI1 grade is slightly better than an SI2 grade. Inclusions may be visible with the unaided eye. These diamonds offer an exceptional value for the price and quality.

I1: These diamonds have noticeable inclusions. Preciousglow.com does not suggest diamonds of this grade for fine jewelry. While you may find I1-grade diamonds elsewhere, Preciousglow.com does not carry diamonds with this clarity grade.

I2-3: These are inferior grades of clarity with noticeable unattractive inclusions. Preciousglow.com does not carry diamonds with clarity grades of I2-3.