Cut is the factor that fuels a diamond’s fire, sparkle and brilliance. If a diamond is cut to shallow, light entering the face of the diamond passes through and out the bottom. A diamond cut too deep causes light entering the diamond to reflect out the sides of the stone. A perfectly cut diamond allows the light entering to reflect off the inner angles of the diamond and reflect back to the top of the diamond. This causes a perfect cut diamond to have a brilliance to its appearance. Diamonds are cut in many popular shapes such as round, princess, oval, marquise and other unique shapes.