Most diamonds have unique clarity characteristics. These distinguishing characteristics can be classified as inclusions and blemishes. Inclusions are enclosed within a diamond or extend into the diamond from its surface while blemishes, on the other hand, are confined to the diamond's surface. When light enters a diamond, it is reflected in and refracted out. If anything disrupts the flow of light through the diamond, such as an inclusion, a proportion of the light reflected may be lost. This effect can detract from the pure beauty of the diamond.