A diamond with fair symmetry refers to a diamond that has been cut and polished in such a way that its different facets are somewhat misaligned or unbalanced. This can affect the way that light is reflected and refracted within the stone, and may result in a less sparkling or less vibrant appearance. Diamonds with fair symmetry are generally considered to be of lower quality compared to diamonds with good, very good, or excellent symmetry. However, it is important to note that the overall beauty of a diamond is dependent on a combination of factors, and a diamond with fair symmetry may still be considered attractive to some people.