The three diamond shapes that are most similar to an oval cut are the round brilliant, the cushion cut and the marquise shape. The round brilliant is more traditional but it is often brighter, with more brilliance because of its increased symmetry. However you lose the finger-lengthening appeal of the elongated shape of an oval cut. A round brilliant will also look smaller and cost more per carat than an oval shape.
A cushion cut has a similar charm to the oval shape. It is often more brilliant, with cuts like the hearts and arrows Cushion Brilliant diamond, rivaling the brilliance of a round. Although a cushion cut usually has a similar price per carat as an oval shape, it looks a bit smaller to the eye.
A marquise cut is another option for those who love the oval shape. It has a similar finger-lengthening silhouette and large face-up appearance. It often is even less per carat because it isn’t quite as fashionable as the oval shape right now. One drawback to the marquise shape is that the exposed points at each end can chip over the years unless the points are protected in the setting. If you are active or work with your hands, this may limit the style options for a marquise engagement ring.