The round brilliant diamond is the most popular and perhaps the most technically advanced of all of the diamond shapes. Only after the development of new diamond cutting technology and a breakthrough in research regarding proportion and symmetry, was the round brilliant born and accounts for more than 75% of diamonds sold today With other diamond shapes, having lower color grade and clarity usually means giving up some of the beauty of the stone. Because a round-cut diamond gives out higher levels of brilliance and fire, it will offer much of the same pleasant appeal even if it has a lower color, clarity, or cut.

Length-to-width ratio of Round cut Diamond determines how a diamond will look like when viewed from above. For round shaped diamond, look for a length-to-width ratio between 1 and 1.02.