The round brilliant cut is the standard of the diamond engagement rings but the princess cut is the most popular among the non-round diamonds. It gives you a touch of innovation and a maximum brilliance to the diamond.
When choosing a setting for your princess diamond you need to be sure that the 4 corners are protected. The flaws or imperfections are more difficult to be seen in this cut.
For a square princess diamond shape look for length-to-width ratios between 1 and 1.05. If you prefer more of a rectangular shape, look for length-to-width ratios greater than 1.10