The radiant cut diamond is a gorgeous conglomeration of brilliant facets, similar to those of a round diamond, in the shape similar to an emerald-cut diamond. Developed in the late 1970s, the radiant diamond was the very first diamond to have a rectangular shape and brilliant facets. These characteristics make it sparkle and shine like few other stone shapes. As only about 2% of the world’s diamonds are sold as radiant cuts, having one will make you and your jewelry stand out. 

What Is a Radiant Cut Diamond?

Because it is a less commonly known diamond shape, many people find themselves asking, “What is a radiant cut diamond?” These uniquely shaped diamonds can either be square or rectangular in overall shape, with corners “cut off” on a diagonal. While a radiant cut is sometimes confused with a cushion cut, the radiant is more angular than rounded. Its overall silhouette is similar to that of an emerald, although its actual facets are quite different. This makes a radiant diamond an ideal choice for someone who loves the contours of an emerald but prefers the brilliant sparkle of a round diamond.

GIA Certified 10.65 Carat Radiant Cut Diamond Engagement Ring in Platinum


What is Most Important in Radiant Cut Diamonds?

As with any piece of jewelry, the most important thing is that you like the way it looks. But when you’re comparing the 4Cs of diamond quality, the one you should focus on the most is the cut. Not only do you need to consider the ratio of this particular cut, but you should also pay attention to the depth of the stone’s cut, as these both play a role in how much it sparkles. 

However, the Gemological Institute of America (GIA) doesn’t grade the cut of radiant diamonds, so you’ll need to depend on a jewelry professional and your own eye to determine the overall quality of the diamond’s cut. 

Are All Radiant Cut Diamonds Square?

Not all radiant diamonds are squares; some are rectangles. This is one of the best things about this cut: It’s even more customizable than your average diamond or jewelry setting. 

If you prefer the more square look, opt for a radiant stone with a more even ratio, such as 1.00 to 1.05. But if you like the rectangular look, you can select a stone with a ratio between 1.10 and 1.40. Much of this comes down to preference, but the ratio can play a role in the sparkle and overall appearance of a radiant stone, so it’s always a good idea to have a professional jeweler advise you on your final selection.

What is the Most Popular Jewelry for Radiant Cut Diamonds?

Without a doubt, rings are the most popular jewelry associated with radiant diamonds. Between engagement rings, right-hand rings, anniversary rings, and more, radiant diamonds are showing up on the hands of women everywhere. 

One fantastic choice is this radiant cut diamond three-stone ring, which features a gorgeous 2 carat yellow diamond as the center stone. Alternatively, you may want a more unique option with a pop of bold color, such as this colorful radiant cut diamond fashion ring. It boasts several fancy radiant cut colored diamonds, all bezel set and surrounded by lines of round brilliant diamonds.

31.36 Carat Radiant Cut Diamond Tennis Bracelet

GIA Certified 31.36 Carat Total Radiant Cut Diamond Tennis Bracelet in Platinum

Radiant Cut Diamond Rings & Jewelry – Guide

When searching for the perfect radiant diamond, you have a lot to consider. Fortunately, our diamond professionals have put together this handy guide for you as a starting point. So whether you’re searching for radiant cut diamond engagement rings, right-hand radiant diamond rings, or loose radiant-shaped diamonds, you’ll discover the ins and outs of this stunning and unique diamond shape.


While most diamond shapes are distinctive with one solitary look, radiant cut diamonds are different. They can be cut into two shapes: square or rectangular. Each of these is unique in its own right. Your decision will likely be based on personal preference and what you’ll be setting the diamond in. Most people prefer elongated radiant cut engagement rings because they like the length and the way it sometimes looks larger on the finger.


When you’re deciding between a square and rectangular radiant diamond, you will want to explore the ratios of each. While the ratio isn’t an indicator of how much the diamond will sparkle, know that it does have an impact on the overall appearance of the diamond, particularly once it is set. For most square stones, the ratio for a radiant diamond should be between 1.00 and 1.05. For a rectangular shape, the ideal ratio is around 1.25, although it can range from 1.08 to 1.36 or more.


While white and colorless diamonds are an obvious first choice for all diamond shapes, the radiant diamond is also beautiful in other unique and fancy colors. Because of their faceting structure and the depth of the diamond, the tones are often deeper and more saturated in this cut than in others, making them especially beautiful and sparkly. For example, for a radiant cut diamond engagement ring, you might opt for a diamond in the colorless to near-colorless range. Whereas for a pendant necklace, a slightly tinted radiant diamond would be possible also.


As with any diamond, the setting is hugely important to the overall look of the stone. You’ll want to explore the other features that you may wish to be included in your setting. For example, a diamond with a halo and side stones will look very different from a solitaire rectangular diamond ring. If you’re looking at individual stones outside of a piece of jewelry, you will still want to think about how you plan to set those stones. An elongated radiant cut diamond ring, for instance, will require a different clarity and carat than radiant cut diamond earrings. It’s also helpful to have settings in mind when you’re exploring loose diamonds.

Shop Radiant Cut Diamonds at Roman Malakov in NYC

Ready to learn more about radiant cut diamonds for sale? Visit Roman Malakov in-store or online for more information about radiant diamonds, setting options, and more. Our store is located right in the heart of the Diamond District, and we would love to show you our exclusive selection of stones and jewelry.