One of the great things about this diamond shape is that you can afford to go for a lower carat if need be, as the shape optimises carat weight. What this means is that it can appear larger than other shaped diamonds of the same weight. One of the most crucial factors to consider when buying an Oval engagement ring is the length to width ratio. This is because it can have an impact on the appearance of the finger and the light dispersion in the stone. In terms of settings, a bezel setting, six-prong setting, and four-prong setting all work well.
Similar to the marquise, oval cut diamonds can display a bow tie effect: a dark area shaped like a bow tie in the centre of the diamond. The bow tie effect appears in some fancy cut diamonds such as marquise, hearts and oval cut diamonds. read more about the bow-tie effect on this
link.