Radiant cut engagement rings are a great choice if you want your center stone to really stand out. Known as one of the sparkliest ring cuts, a radiant diamond shines because it’s cut with many brilliant facets that easily reflect light. While it’s not as popular as rectangular shapes like emerald or cushion cuts, it’s still a wonderful option for someone who wants their center stone to always catch the light and twinkle.

Thinking about choosing a radiant cut stone for a lifetime piece? Here, experts explain everything you need to know about radiant cut engagement rings.

What Is a Radiant Cut Diamond?

A radiant cut diamond is a sparkling stone with a sleek rectangular shape—an easy pick for anyone who wants extra wow factor in their engagement ring. “When the timeless brilliance of a round diamond met the elegant sophistication of an emerald shape, the radiant cut was born,” says Mahiar Borhanjoo, Chief Commercial Officer and SVP of Polish at De Beers Group. “Created in the mid-1970s by Henry Grossbard, the radiant cut was inspired by a simple yet visionary idea: to bring the captivating sparkle, fire, and life of a round brilliant into a more architectural and contemporary shape.”

He adds, “Grossbard admired the unmatched beauty of the round brilliant cut and wanted to recreate that same feeling within the clean lines of a rectangular or square diamond. The result was revolutionary. A radiant cut diamond has 70 beautifully arranged facets, each acting like a tiny mirror that guides and reflects light deep inside the stone.”

Balance and proportion are key for a well-cut radiant diamond. “The best examples often have a table percentage between 61% and 69%, a depth ranging from 61% to 67%, and a slightly thicker girdle for better durability and presence,” says Borhanjoo.

What Makes a Radiant Cut Special?

The brilliance of a radiant cut is its true standout feature. “So many people fall in love with emerald cuts on Instagram—until they see one in person and realize they want something with more fire. That’s where the radiant cut shines,” says Kegan Fisher, co-founder of jewelry brand Frank Darling. “The faceting pattern is what really sets radiant cuts apart. Unlike round brilliants or cushion cuts, which give larger, more distinct flashes of light, radiant cuts are known for their all-over sparkle and evenly spread light and dark contrast—like stars twinkling in the night sky.”

When used as the center stone of an engagement ring, this diamond looks flattering on the hand and takes up a good amount of space, especially in a larger carat size. “Thanks to their crisp rectangular shape and brilliant faceting, radiant cut diamonds create a continuous line of light that feels sleek, modern, and incredibly bright,” says Fisher. “Think maximum brilliance with a little extra edge.”

How to Evaluate Radiant Cuts for the 4Cs

The 4Cs are the standard GIA grading scale for diamonds, which rates cut, color, clarity, and carat size. The combined rating determines how jewelers price a stone. It’s often wise to focus on the grading factors that matter most for a specific stone to get the best value. Note that for a radiant stone, cut isn’t graded, but color, clarity, and carat size are important. Fisher suggests you might want a higher color grade for this cut. “Their faceting pattern can concentrate warmth, especially in the corners, so we often recommend going one color grade higher than you might choose in another shape,” she says.

“Clarity, on the other hand, is one area where radiants shine,” Fisher shares. “The crushed-ice faceting does a great job of hiding inclusions, making them one of the most forgiving fancy shapes when it comes to clarity. In many cases, you can comfortably choose a slightly lower clarity grade without losing beauty.” Carat weight tells you the size of the stone. It’s bestWhen choosing a radiant cut diamond, think about how the stone spreads across your finger to find the proportions you like best. In short, focus on getting a higher color grade and the size you want when buying a radiant cut ring.

Photo: Courtesy of Frank Darling

How to Choose Style and Setting

The way you set your radiant cut diamond depends on your personal taste. “Whether set alone or with elegant side stones, the radiant cut offers a perfect mix of modern glamour, balance, and lasting beauty,” says Borhanjoo. “It looks especially stunning as a solitaire, where its brilliance and graceful shape can really stand out. Its elongated silhouette flows nicely along the finger, creating a refined, flattering, and effortlessly sophisticated look.” For a modern take on the classic solitaire, couples might consider an east-west engagement ring or a bezel setting.

“The radiant cut is also captivating in a three-stone design,” adds Borhanjoo. “Paired with perfectly matched shield or trillion-cut side stones, the center diamond becomes even more dramatic and expressive. The angular lines of the side stones beautifully complement the radiant brilliance, creating a ring that feels both architectural and deeply romantic.”

Other Tips and Considerations

There are small details to keep in mind when picking your stone that can greatly affect how your engagement ring looks. “One key thing to look for is the absence of a visible ‘bow tie’ effect,” notes Borhanjoo. “A dark shadow across the center of the diamond can interrupt the flow of light and reduce its beauty. In well-cut radiant diamonds, this effect should be minimal or completely absent, so the stone looks bright, lively, and balanced from every angle.”

Fisher adds, “Another common issue is an overly deep or ‘chunky’ pavilion, where the bottom of the diamond bulges out. This can make the stone carry its weight below the surface, so it appears smaller than you’d expect for its carat weight.” To avoid this, it’s best to see the stone in person before buying to check how it spreads in real life.

You should also consider the length-to-width ratio of your radiant diamond. Some stones are long and elongated, while others are closer to square. Your choice depends on your preference and the setting. “While square radiants do exist, most clients prefer elongated stones with a length-to-width ratio of 1.35 or higher,” explains Fisher. “That sweet spot gives the finger-flattering look radiants are known for, while still keeping enough width to feel balanced and substantial.” She notes that lab-grown diamonds offer the most options for finding the best ratio, since they’re less rare.

“Our general rule of thumb: if a radiant cut seems too good to be true, it probably is,” she says. “More often than not, the discount comes from hidden compromises in cut, depth, or proportions that affect how the diamond actually looks in person.”

Our Favorite Radiant Cut Engagement Rings

VENICE, ITALY – SEPTEMBER 01: Olivia Palermo attends a red carpet for the movie “Finalmente L’Alba” at the 80th Venice International Film Festival on September 01, 2023 in Venice, Italy. (Photo by Stefania D’Alessandro/WireImage)

Stefania D’Alessandro

One radiant cut engagement ring we love is the yellow diamond stunner worn by Olivia Palermo. A bit different from the usual radiant thanks to its rich canary tone, this three-stone piece really makes a statement. Palermo recently renewed her vows, so we can only imagine she found another great ring to add to her collection.

Frequently Asked Questions
Here is a list of FAQs about Radiant cut engagement rings written in a natural tone with clear and direct answers

BeginnerLevel Questions

1 What exactly is a Radiant cut diamond
Its a rectangular or squareshaped diamond with trimmed corners Its famous for having over 70 facets which gives it a brilliant crushedice sparkle similar to a round diamond but in a modern shape

2 Whats the difference between a Radiant cut and a Princess cut
The main difference is the corners A Radiant cut has beveled corners while a Princess cut has sharp pointed corners Radiant cuts also tend to have more sparkle and a softer more vintage look

3 Do Radiant cut rings look bigger than other shapes
Yes generally Because of their elongated shape and large table they can look larger than a round diamond of the same carat weight The long shape also makes fingers appear longer and slimmer

4 Is a Radiant cut good for a daily wear engagement ring
Absolutely Its a very durable shape with no sharp points that could chip Just make sure the setting has a protective bezel or strong prongs to secure the corners

5 Why are Radiant cuts so popular right now
They offer the best of both worlds the modern geometric look of a stepcut with the high sparkle of a round brilliant They also look incredible in threestone and halo settings

Intermediate Advanced Questions

6 Whats the ideal cut grade for a Radiant diamond
Aim for an Excellent or Very Good cut grade Because Radiant cuts are a modified brilliant shape they can vary widely in light performance A poor cut can look dull or have dark bowtie shadows across the center

7 Do Radiant cuts hide inclusions well
Yes very well The crushedice facet pattern scatters light which helps hide small inclusions You can often go down to an SI1 or even SI2 clarity grade and still have a eyeclean diamond

8 Whats a bowtie effect in a Radiant cut
Its a dark shadowy area that can appear across the center of the diamond shaped