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Diamond Size Chart 

Diamond Carat Size Chart 


The following diamond size chart provides a very effective way to view both diamond sizes and shapes on the finger. Using the menus, select your desired diamond shape and carat weight. Use our diamond mm. size chart to find out approximate mm. sizes for popular diamond shapes. This handy reference tool gives all of the diamond carat weight and mm. sizes for all of the diamond shapes in an easy to use tool, perfect for reference. The following size chart includes sizes of Round, Princess, Oval, Emerald-cut, Pear-shape, Heart-shaped, Cushion-cut, Marquise, Asscher, princess-cut and radiant-cut diamonds.  


Diamond mm. size chart showing shapes, mm. size and diameter

Notes on diamond mm size


Many diamonds size charts typically vary according to the measurements provided. Diamond sizes vary depending on how the diamond is cut. The proportions differ depending on the make of the stone. The visible size of a diamond is often referred to as the spread of the stone. For consistency, we prefer to demonstrate realistic diamond sizes, typical for well-proportioned diamonds.

Important! - consider carat weight and size when buying diamonds.


When you purchase a diamond, consider both carat weight and physical size along with other factors. Let us explain why this is important. 

John, purchased a diamond online. The diamond weighed 0.60cts and seemed remarkable value. It was GIA certified which provided even greater reassurance. If John had considered the size of the diamond he would have realised the stone was cut a little deeply. It only measured 5.1mm. If he'd purchased a diamond 0.55cts with a better cut, he would benefit from a superior diamond, with greater brilliance. 

Handy rules of thumb for diamond sizes.


Many diamond shapes weigh heavier than round diamonds. There are no tricks to learning diamond sizes. A diamond expert learns sizes over many years through experience and learning. Most people rely on reference material like the chart and application above.

Diamond size knowledge is essential when providing information to others. Such guidance forms part of our service at Serendipity Diamonds. If you are searching for any size, shape, colour or clarity of diamond then contact us for help.