Diamond Shape & Size Comparison Tool

How big is a 1 carat Round Brilliant diamond? It’s exactly 6.5mm. But what does 6.5mm actually look like? And if you compare it to a 1 carat Cushion Cut at 5.5mm, which one visually appears larger face-up?

Welcome to the internet’s most comprehensive Diamond Size Simulator. Whether you are shopping for the perfect engagement ring, studying gemology, or simply exploring, our platform makes it easy to compare actual diamond dimensions side-by-side.

With over 35 distinct diamond shapes in our database, you can visualize exact mm measurements, see which shape offers the largest surface area percentage, and understand true carat weight proportions.

Stop guessing. Jump straight into the interactive size simulator to see the difference for yourself.