This is the most popular fancy-shaped diamond. A princess cut diamond is also a good choice because of its flexibility when styling a ring. A princess is traditionally square in shape but it depends on the dimension or length-to-width ratio that you request for. Princess cut diamonds cost less than round cut diamonds because the four sided pyramid shape is similar to half of the rough stone where a princess diamond is cut which translates to cutting two equally sized diamonds and having little waste compared to that of a round shaped one. The more rectangular a princess cut diamond is, the lesser it costs. There are other diamond shapes that have square cut too but a princess cut diamond is the closest to a round cut diamond when it comes to achieving fire and brilliance.