FL, which stands for ‘flawless.’ A diamond with an FL clarity grade has zero inclusions and no blemishes on the surface. Diamonds of this clarity grade are rarer than lower-graded diamonds, and they are of higher quality. As such, the price of these gems is much higher.
For most people, an FL diamond isn’t a financially viable option and many people prefer a VVS (very very slightly included) or VS (very slightly included) rated gem. If you have your heart set on a higher clarity diamond, consider a lab-grown stone as these are more affordable, while being identical to mined diamonds.