When it comes to deciding which diamond ring you want to have, you will have to do a lot of research. Though, we can tell you that the princess cut diamond ring is the second most popular design ring in the world. It is also known as a square modified brilliant. It is a square or a rectangle when it is looked upon from above and also looks like an inverted pyramid when you see it from the side. Hence. Its cutting and designing are done very effectively and with focus.