The cut of a diamond can be ambiguous as it refers to both the shape in a general sense and then the actual cut quality or make in a more detailed description. There are many diamond shapes; the most popular is the round brilliant diamond. The round brilliant is the classic diamond shape and contains 58 facets including the culet. The round brilliant shape is the most expensive as it is usually possible to retain more carat size by cutting to fancy shapes than cut to a round. The choice of shape is your personal preference, below are some pictures of different diamond shapes:

The term cut in a accurate sense defines the Diamonds "make", symmetry and dimensions. The diamond's cut influences its ability to handle light refraction and create sparkle, scintillation and life. When a diamond is well cut the diamond's facets will be in alignment and allow light to refract within and then dispersed through the top of the diamond. With perfect light dispersion comes the beautiful diamond sparkle.