A fair polish diamond is a diamond that has a finish on its surface that is only slightly reflective, and may have a number of noticeable blemishes or scratches when viewed under 10x magnification. The fair polish grade is the second lowest polish grade given by the Gemological Institute of America (GIA), and is considered to be below average in terms of polish quality. A diamond's polish is evaluated based on the quality of the finish on the diamond's surface. A diamond with fair polish will have a slightly reflective finish, but may have a number of noticeable blemishes or scratches when viewed under 10x magnification. These blemishes or scratches may be noticeable to the naked eye and could affect the diamond's overall appearance.