A diamond’s length to width ratio reveals how proportionate it is according to its intended shape (i.e. square or rectangular). To calculate the length to width ratio, divide the length of the diamond by its width. For instance, a diamond with a length of 5.5mm and a width of 3.5mm has a length to width ratio of 1.57.
While primarily dependent on personal style and preference, the Oval Cut Diamond is usually most appealing with a ratio between 1.30-1.50. Review various Oval Diamonds to determine which ratio is most appealing to you.