The brilliant rectanle.
The radiant cut diamond is the ultimate hybrid shape — combining the clean rectangular outline of an emerald cut with the intense sparkle of a round brilliant. Invented in 1977 by Henry Grossbard, the radiant was the first rectangular shape with a complete brilliant-cut facet pattern, solving the "less sparkle" trade-off of step-cut diamonds.
Every radiant cut diamond in our collection is GIA, HRD or IGI certified and individually selected for exceptional brilliance and symmetry. Its cropped corners and 70 precisely angled facets produce the most intense sparkle of any rectangular shape — making it the perfect choice for buyers who want geometric elegance without sacrificing fire.
Facets
MOST Popular
Grossbard
Brilliant + Geometric
What makes it special
Key Characteristics
Why the radiant cut is the go-to shape for buyers who refuse to compromise between sparkle and geometry.
Maximum Rectangular Sparkle
With 70 brilliant-cut facets — the most of any rectangular shape — the radiant delivers fire and scintillation that rivals the round brilliant, while maintaining clean geometric lines.
Trimmed Corners
The cropped corners give the radiant its distinctive octagonal outline, add structural durability against chipping, and create a softer look than sharp-cornered rectangles like the princess.
Intensifies Colour
Like the cushion, the radiant's brilliant facets concentrate colour beautifully — making it a top choice for fancy yellow, pink and champagne diamonds. It enhances saturation rather than diluting it.
Square or Rectangular
Available in both square (1.00–1.05 ratio) and elongated (1.15–1.35 ratio) proportions. Choose square for a modern look, or elongated for a finger-flattering silhouette.
Our Collection
Radiant Cut Diamonds
Hand-picked certified princess cut diamonds from our current stock — at prices up to 75% below retail.
Expert Advice
Why Choose a Radiant Cut Diamond?
The Best of Both Worlds
The radiant is the only rectangular shape that delivers round-brilliant-level sparkle. If you love the clean lines of an emerald cut but can't sacrifice sparkle, the radiant is your answer — 70 facets of pure brilliance in a geometric frame.
Hides Inclusions Exceptionally Well
Unlike the emerald cut's open "window" facets, the radiant's complex brilliant pattern breaks up light in all directions — effectively masking minor inclusions and slight colour tints. You can confidently choose VS2 or even SI1 clarity and still enjoy a clean-looking diamond.
Outstanding Value
Radiant cut diamonds typically cost 30–40% less than a comparable round brilliant. Combined with excellent rough retention during cutting, you get significantly more sparkle per euro than with most other shapes.
Durable Cropped Corners
The trimmed corners aren't just aesthetic — they add real-world durability. Unlike the princess cut's sharp 90° corners, the radiant's bevelled edges resist chipping, making it a practical choice for active lifestyles.
Top Choice for Fancy Colours
The radiant's brilliant faceting intensifies colour saturation, making it — alongside the cushion — the preferred shape for fancy yellow, pink and champagne diamonds. If you're investing in colour, the radiant delivers maximum impact.
Explore More
Other Diamond Shapes
Not sure if a radiant cut diamond is right for you? Explore our complete range of certified diamond shapes
Pear
A teardrop silhouette combining the best of round and marquise cuts.
Round Brilliant
Princess
Heart
Marquise
Diamond education
How to Choose Your Perfect Diamond
Selecting a certified loose diamond is a personal journey. Every stone is unique, and the right choice depends on a balance of the four fundamental quality factors — known as the 4 C's of diamond
Use our search tool above to filter by cut, colour, clarity and carat weight. Compare certificates, review 360° imagery, and find the stone that matches your taste and budget. Not sure where to start? Our experts are here to help.
Diamond Cut
Diamond Color
Diamond Clarity
Diamond Carat
COMMON Questions
Radiant Cut Diamond FAQ
Everything you need to know about buying a radiant cut diamond.
About Radiant Cut Diamonds
What is the difference between a radiant and an emerald cut?
Both are rectangular with cropped corners, but the facet pattern is completely different. The emerald uses step-cut facets (long, parallel lines) that create a "hall of mirrors" effect and emphasise clarity. The radiant uses brilliant-cut facets (triangular and kite-shaped) that maximise sparkle and fire. Choose emerald for understated elegance, radiant for maximum brilliance.
Should I choose a square or elongated radiant?
A square radiant (ratio 1.00–1.05) looks modern and compact — similar to a cushion but with more geometric lines. An elongated radiant (ratio 1.15–1.35) flatters the finger and appears larger. Neither is "better" — it's purely personal preference. We stock both proportions.
What clarity grade do I need for a radiant cut?
Buying from Diamantwerp
Are all your diamonds certified?
Yes — every diamond in our collection is independently certified by GIA (Gemological Institute of America), HRD Antwerp, or IGI (International Gemological Institute). These are the three most respected and internationally recognised diamond grading laboratories. Each certificate provides an objective assessment of the diamond's cut, colour, clarity and carat weight.
How can your prices be so much lower?
We buy directly from cutters and sight-holders in the Antwerp diamond district — cutting out multiple intermediaries. Our low-overhead business model means we pass the savings directly to you. Same certified diamonds, fraction of the price.
Can I view the diamond before buying?
Absolutely. You are welcome to view any diamond by appointment at our office in the Antwerp diamond district (Pelikaanstraat 62). We also offer personal delivery within Belgium and secure insured shipping across Europe. Schedule a viewing.