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Radiant Cut Diamonds

A relatively new diamond shape, the radiant cut was designed by Henry Grossbard in the late 1970s. He created a cutting technique that combined the best elements of emerald and round diamond shapes–allowing radiant diamonds to exhibit incredible brilliance and fire.

What is a radiant diamond?

True to its name, this cut is truly radiant. While the octagonal shape and cropped corners do make it similar to the emerald cut, the faceting is reminiscent of the round brilliant cut.

This combination gives radiant diamonds considerable fire and sparkle.

With 70 facets, the radiant cut is one of the most brilliant diamond shapes available today. It’s a new cut, created just over 30 years ago by master diamond cutter Henry Grossbard who worked to combine the best elements of the emerald and round brilliant cuts.

The radiant is often labeled as a cut-cornered rectangular or square modified brilliant by the GIA when grading diamonds of this shape.

Why should I choose a radiant diamond?

Radiant cut diamonds possess a silhouette shape very similar to an emerald shape, but its facets are cut in a more similar way to that of round diamonds. This means that the appearance of the diamond has an effervescent sparkle, hypnotising those who catch its gaze.

Though the radiant has only been available for a short time, it has quickly increased in popularity. You’ll always find radiant diamond engagement rings listed in the most popular styles.

Radiant cuts are perfect for those loving the contours of an emerald cut but craving the sparkle of a round brilliant cut diamond.

Radiants are also ideal cuts for coloured diamonds. Due to its faceting structure, this cut provides a depth which emphasises the colour tones of any diamond.

Radiant Cut Ratio

Ratios for radiant cut diamonds depend on personal preference. The most common ratio for a traditional, rectangular shaped radiant cut diamond is 1.25 although ratios range from 1.05 – 1.50. For a square radiant cut, a ratio between 1.00-1.05 is ideal.


radiant diamond ratio

Elongated radiant cut

The ratio significantly impacts the diamond’s visual characteristics. A higher ratio (greater than 1.3) creates a more rectangular appearance, while a lower ratio (around 1.0 to 1.3) results in a squarer shape.

The elongated radiant cut combines the best of both worlds: the dazzling sparkle of brilliant cuts and the elongated silhouette reminiscent of emerald cuts. This blend of characteristics allows for a striking balance between fire and geometry, making it an ideal choice for those who appreciate a fusion of classic and modern aesthetics. Due to its elongated form, this cut can create a flattering visual effect on the finger, making it appear slender and graceful. Additionally, the elongated shape can also make the diamond stand out in various settings, from solitaire rings to halo designs. In summary, the elongated radiant cut offers a refreshing twist on the classic radiant cut, delivering a sophisticated and captivating diamond that combines timeless brilliance with a contemporary elongated silhouette. 

Radiant Ratio Chart

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Radiant Cut

While radiant cut diamonds don’t have an official cut grade, the chart below offers a general guide on how to choose the cut of your radiant diamond.

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Table %61-6957-60
Depth %61-6759-60.9
GirdleVery Thin - Slightly ThickVery Thin - Slightly ThickVery Thin - ThickVery Thin - Very ThickEx. Thin - Ex. Thick

Radiant Diamond Colour

What colour is best for a radiant diamond?

Evaluating colour in radiant cut diamonds is entirely dependent on the preference of its buyer or wearer.

Diamonds in the colourless range (D-F) carry a premium due to the fact that they are incredibly rare, but the truth is, the difference between the colourless and near colourless (G-J) grade ranges is difficult to perceive, especially to the naked eye.

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Radiant Diamond Clarity

What clarity should I choose for a radiant cut diamond?

When diamonds are formed deep in the earth, they develop clarity characteristics–slight irregularities visible under 10x magnification. Depending on the size, quantity, placement, tone or colour of these clarity characteristics, they may or may not be visible to the naked eye. This is one of the reasons why a truly flawless diamond is so rare and carries a price premium.

When it comes to choosing diamond clarity, the choice is yours. Some may be happy with a diamond that features clarity characteristics that aren’t visible to the naked eye, while others desire absolute perfection with a technically flawless clarity grade.

Due to their extra facets, radiant cut diamonds disperse more light throughout the diamond, giving clarity characteristics (inclusions) more places to hide. For this reason, you can consider choosing a lower clarity grade.

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Emerald vs radiant cut

Radiant and emerald cuts are popular diamond shapes frequently used in jewelry, each boasting its own unique attributes and allure. Let’s delve into a comparison of their distinctive features:

When it comes to the way they reflect light:

The radiant cut stands out for its remarkable facet arrangement, combining the brilliance seen in round brilliant cuts with the sophisticated outline of square or rectangular diamonds. This cut showcases a captivating arrangement of triangular and kite-shaped facets that extend from the center outward, producing a mesmerizing interplay of light.

On the other hand, the emerald cut features a step-cut facet pattern that accentuates its clarity and transparency. Its rectangular form displays broad, open facets adorned with parallel lines resembling a set of steps. This approach emphasizes the diamond’s clarity and creates a more understated light reflection compared to the dazzling effect of brilliant cuts.

Considering their brilliance and sparkle

The radiant cut is designed to maximize sparkle and brilliance, similar to round brilliant cuts, thanks to its intricate facet design. This makes it an excellent choice for those who desire a diamond with exceptional radiance and vibrancy.

In contrast, the emerald cut prioritizes the diamond’s clarity and transparency over intense sparkle. While it may not exhibit the same level of brilliance as the radiant cut, it possesses a distinctive and refined beauty that appeals to those with a penchant for understated elegance.

Taking into account their clarity attributes

The radiant cut’s faceting serves to conceal minor imperfections and inclusions within the diamond, contributing to its overall brilliance and appeal.

On the other hand, the emerald cut’s step-cut facets are less forgiving when it comes to flaws and imperfections. This characteristic tends to accentuate the diamond’s clarity, leading to a preference for higher clarity grades.

Radiant vs Cushion cut

Facet Pattern

Radiant Cut: Features a brilliant facet pattern with triangular and kite-shaped facets, maximizing light return and sparkle.

Cushion Cut: Exhibits a mixed facet pattern with larger facets that provide a balance between brilliance and fire, especially in antique-style cushion cuts.

Considering their brilliance and sparkle

Radiant Cut: Known for its high sparkle and brilliance due to its faceting, comparable to round brilliant cuts.

Cushion Cut: Offers a blend of brilliance and fire, especially in modern brilliant-style cushion cuts, which have smaller, more intricate facets.

Radiant cut diamond with round and carre cut diamond halo set in platinum

Taking into account their clarity attributes

Radiant Cut: Faceting can help hide minor inclusions, contributing to its overall brilliance.

Cushion Cut: Clarity characteristics are more visible in cushion cuts due to their larger facets and open nature, so higher clarity grades are often favored.

Modern vs. Vintage

Radiant cut has a contemporary and brilliant appearance, suitable for those who desire a modern yet distinctive look.

Cushion cut offers a vintage vibe, especially in antique-style cuts, making it an excellent choice for those who value timeless elegance.

Radiant vs Princess cut

Considering the way they reflect light:

The radiant cut showcases triangular and kite-shaped facets that produce a radiant sparkle, artfully combining round brilliance with the lines of square or rectangular outlines.

The princess cut displays a square or rectangular shape adorned with pointed corners and a brilliant facet arrangement that intensifies sparkle and fire.

When discussing brilliance and sparkle:

Radiant cuts are designed to provide brilliant sparkle due to their facet layout, reminiscent of round brilliant cuts.

Princess cuts excel in brilliance, with their multiple facets effectively reflecting light from numerous angles, resulting in remarkable sparkle.



Regarding clarity:

Radiant cuts employ their faceting pattern to help conceal minor imperfections and inclusions, adding to their overall brilliance.

Princess cuts often reveal clarity traits more readily due to their many facets and sharp corners.

In terms of modern versus classic:

Radiant cuts blend modern brilliance with an exclusive shape, catering to those in search of a modern yet unconventional appearance.

Princess cuts embody a modern and stylish look while preserving a classic square or rectangular contour.

How to choose the right radiant cut diamond

Choosing the right radiant cut diamond involves considering various factors to ensure the diamond matches your preferences and desires. Here’s a step-by-step guide to help you make an informed decision:

Budget: Determine your budget range for the diamond. Radiant cut diamonds can vary significantly in price based on factors like size, color, clarity, and overall quality.

Cut Quality: Assess the cut quality, as it greatly influences the diamond’s brilliance. Look for a well-proportioned radiant cut with a balanced arrangement of facets that create optimal light reflection.

Carat Weight: Decide on the carat weight you prefer. Remember that the size of the diamond affects its visual impact, but it’s essential to strike a balance between size and other qualities.

Color Grade: Choose a color grade based on your preference. For a colorless appearance, opt for diamonds in the D to G range. For a balance of value and color, consider diamonds in the H to J range.

Clarity Grade: Consider the clarity grade, which reflects the presence of any internal or external imperfections (inclusions or blemishes). Choose a clarity grade that appears clean to the naked eye, such as VS1 to SI1.

Certification: Purchase a radiant cut diamond with a reputable diamond grading certificate, preferably from GIA or AGS. This provides you with an unbiased assessment of the diamond’s quality.

Trustworthy Retailer: Purchase from a reputable and trustworthy jeweler or online retailer with a good track record. Read reviews and ensure they offer return policies and warranties.

Ethical Considerations: If ethics matter to you, choose a diamond with transparent sourcing and certification through conflict-free channels.

Remember that choosing a radiant cut diamond is a personal journey. It’s essential to prioritize your preferences, budget, and emotional significance, ultimately finding a diamond that symbolizes your commitment and resonates with your partner’s style.

Radiant cut engagement rings

Radiant cut engagement rings have emerged as a captivating choice, seamlessly fusing the brilliance of round cuts with the sleek lines of square or rectangular shapes. These rings exude a distinctive charm that resonates with modern couples seeking a blend of contemporary allure and timeless elegance. The radiant cut’s unique faceting pattern, characterized by triangular and kite-shaped facets, grants it an unparalleled ability to reflect and refract light, resulting in a mesmerizing display of sparkle.

Radiant cut engagement rings offer a diverse range of styles and settings to suit individual preferences. From classic solitaire settings that spotlight the radiant cut’s brilliance to intricate halo designs that enhance its luminosity, the possibilities are abundant. The cut’s adaptability shines through in three-stone arrangements, side stone embellishments, and vintage-inspired settings that infuse romance and character into the ring’s design.

The radiant cut’s versatility also extends to the choice of metal, allowing couples to personalize their rings with white gold, yellow gold, rose gold, or platinum settings. This flexibility ensures that each ring reflects the unique love story it symbolizes. With its ability to capture both contemporary trends and timeless beauty, the radiant cut engagement ring stands as a striking testament to enduring love and individual style.

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