With fancy colors, however, the grade and value increase with the color intensity. Truely colorless stones are graded D, and are graded up the alphabet from there according to color. Clarity refers to the presence of internal features such as breaks or foreign bodies, called inclusions , which occur inside the diamond. It also refers to blemishes which are external imperfections such as scratches. Both of these features lower the clarity grade and value of the diamond, but in most cases they have very little effect on a stone's beauty or durability.
Clarity is ranged from flawless to imperfect .
The cut of a diamond can mean the shape in which it is created. Or it can refer to the facet design or proportions of the diamond. The angle at which the diamond is cut determines its sparkle and brillance. The perfect cut allows light to enter the diamond and reflect back out through the top. Too deep or shallow of a cut allows light to pass through the bottom, therefore losing it sparkle and fire.