If the cut of the diamond is too deep, some light escapes through the opposite side of the gemstone. If the cut is too shallow, light again escapes before it could be reflected. Only the world's most skilled cutters can successfully unleash a diamond's rare fire.
Many people confuse cut with the shape of the diamond.
The shape you select such as round, pear, marquise, oval, square or emerald shape is a matter of individual taste, and today your choice is only limited by your imagination. Cutting and polishing determines the amount of light reflected. Most round, brilliant-cut diamonds possess 58 carefully angled flat surfaces, called facets. The way a diamond is cut and polished is vital. It is the precision and delicacy of the cut that dictates the maximum amount of light the diamond will reflect and refract.