round brilliant
By far the most favored diamond shape, round brilliant diamonds are created using precision angles and proportions for the most sparkling, blindingly brilliant diamond possible. Because of their facet pattern, you can opt for a lower clarity grade than other diamond shapes and still have an eye-clean diamond. Round brilliant diamonds will usually look smaller than other shapes with a similar carat weight.
Keep in mind, the chart below is strictly for round brilliant diamonds – other round diamonds with a different cut like rose cut diamonds, old European diamonds, antique cuts, or poorly cut diamonds will vary in size from this chart.
OVAL CUT
Oval shaped stones trail justbehind round brilliant diamonds in terms of brilliance and sparkle factor. Where they win is their size per carat: an oval cut diamond looks larger than other diamonds of a similar carat weight. They’re also super flattering – elongating the look of shorter fingers and offering more finger coverage on larger hands – the best of all worlds.