Marquise: The marquise fancy diamond shape resembles a football, it is long and narrow. A width to length ratio of 1.25 is similar to a round shape, while a width to length ratio of 1.75 is more oblong and resembles a typical oval. Like the princess diamond shape, oval diamond cuts may vary. The advantage of an oval diamond compared to a round diamond that the oblong shape of an oval gives the appearance of a larger diamond. Oval: The brilliance that is a oval diamond achieves is similar to that of a round diamond shape. Like round diamonds, princess shape offers flexibility when balancing diamond color and clarity, although color of the diamond may be slightly visible on the corners of the stone. a length to width ratio greater than 1.10 is ideal. If you prefer more of a square shape, look for a length to width ratio between 1 and 1.05. It is important to note, that princess cut vary in shape, and some may resemble a rectangle more than a square, so it is important to verify the length to width ration of the diamond. The princess diamond shape consists of pointed corners and is traditionally square in shape. Princess: Of the fancy diamond shapes, princess is the most popular, especially for engagement rings. If you are on a budget, but want options, round diamonds offers more flexibility when balancing other diamond characteristics such as cut and clarity to achieve your optimal brilliance and brightness. As a result of the precise method that round diamonds are cut, this shape is able to optimize the reflection of light, which allows the maximization of potential brightness from the stone. Round: Of the ten diamond shapes for engagement rings, round is the most popular. Below are brief descriptions of each of these shapes. Almost all diamond shapes for jewelry come in one of ten shapes, they can be either round or fancy diamond shapes: round, princess, oval, marquise, pear, cushion, emerald, asscher, radiant, and heart. If you are not familiar with diamond jewelry, especially when buying a diamond engagement ring, understanding what your options are in terms of diamond shapes which are available can be confusing.