The Best Diamond Ratio?!

Welcome to The Clear Cut Classroom, where we take deep dives into all things diamonds and jewelry!Diamond ratios are a component of a diamond’s appearance that play a big role in aesthetics and your personal taste. Here are a few diamond ratios for each cut that have gained major popularity lately!




A diamond ratio is the length in millimeters divided by the diamond’s width in millimeters. Each diamond shape has their respective and desirable ratios that come and go with what’s trending. 

Cushion cuts are a traditionally square shaped diamond, usually with a 1.1 - 1.0 length to width ratio. Overtime, more elongated cushion cuts have been a preference for many, these are among the 1.15 to 1.2 length to width ratios. Today, 1.2 to 1.4 length to width ratios are extremely sought-after but very rare!

Oval cut diamonds are a naturally elongated shape but can vary slightly in appearance. Typically you will see standard oval shapes in a 1.3 to a 1.4 length to width ratio. 1.3 ratios in ovals tend to be a bit more rounded, not super long. 1.4 ratios are slightly longer and are a very classic oval ratio. The recent trends of 2023 and 2024 have been very elongated oval cuts, many celebrities proudly wear this shape, which tends to be anywhere from a 1.4 to 1.55 to 1.6 length to width ratio. These ratios make the diamond appear very regal and elegant!

Emerald cuts are a classic example of beautifully elongated shapes that can range in ratio. 1.3 to 1.4 length to width ratios are the common selection but we have seen a rise in very long emerald cuts with 1.55 length to width ratio. Elongated emerald cuts look gorgeous with their step-cut facets, a really appealing feature and enhanced especially when the diamond is longer!

Marquise and pear shaped diamonds are like sisters, or maybe close cousins. They both feature either one or two end points and come in an elongated shape.  Marquise shapes range from a 1.8 to 2.2 length to width ratio, the latter being much more popular these days. With pear shapes, a 1.6 to 1.8 length to width ratio is just right. Pear shapes in the shorter ratio range typically look a little more chubbier and rounded at the bottom. These two fancy cut diamonds are gaining popularity because of their unique flair that sets them apart from square or round shapes. We love that they are getting their time to shine! 

Finally, radiant cut diamonds are another shape that are seeing some shifts in admiration. Another traditionally square diamond, the radiant cut can also be featured as a rectangular shape. Rectangular ratios for radiant cuts are from 1.35 to 1.5 length to width ratio. Elongated radiant cuts are a great choice to really highlight their beautiful faceting patterns. 

What do you think? Diamond ratios play a very important role in the appearance of a diamond shape and always evolve over time. 

Are you ready to create the diamond engagement ring you desire? Book a call with a gemologist today!

Class is dismissed!