Many people confuse cut with the shape (e.g. round or princess) of a diamond. The shape of the diamond is a matter of personal preference and does not directly affect the value. Cut refers to how well the stone is faceted, proportioned, and polished. A good cut will result in a better brilliance, which is why it is the most important of the 4Cs. If a diamond is poorly cut, the diamond will look dull and glassy. It is the work of a master cutter that allows the diamond to be cut in such a way as to permit the maximum amount of light to be reflected through the diamond. The cut is the only diamond component not influenced by nature.