Cut - In it's natural state, a diamond's beauty is generally concealed. How a diamond has been cut, polished, and to what proportions, are of utmost importance. These elements determine the life, brilliance and luster of the diamond. If these cutting factors fall below standard, the appearance of the diamond will be adversely affected. The brilliant of round cut is the most popular, but other exquiste cuts such as the marquise, pear, oval, emerald, heart shapes and others are also highly prized.