Cut is often considered to be a diamond’s most important factor because it determines the amount of “sparkle” or light it radiates. The objective measure of a diamond’s light performance is referred to the cut grade. When a diamond’s cut grade is portioned properly, light is returned out of the top of the diamond (the table). If it is cut too shallow, light leaks out of the bottom; too deep and it escapes out of the side.
• Ideal Cut: Reflects nearly all light that enters the diamond
• Very Good Cut: Reflects nearly as much light as the ideal cut
• Good Cut: Reflects most light that enters
• Fair Cut: Still a quality diamond, but less brilliant than a good cut
• Poor Cut: Diamonds with a poor grading generally are cut too deep, narrow or shallow and wide so that they lose most of the light out the sides and bottom