Certified Radiant Diamonds — Antwerp
The brilliant rectangle — maximum sparkle meets clean geometric lines in every certified stone.
70
FACETS
#8
Most Popular
1977
Grossbard
Our Current Stock
Radiant Cut Diamonds
Hand-picked certified radiant cut diamonds from our current stock — at prices up to 75% below retail.
Expert Advice
Why Choose a Certified Radiant Cut Diamond?
The radiant cut diamond is the ultimate hybrid — the only shape that successfully combines the architectural outline of an emerald cut with the full brilliance of a round. Invented in 1977 by Henry Grossbard, the radiant was the first rectangular shape to feature a complete brilliant-cut facet pattern on both the crown and pavilion, producing a level of fire and scintillation that no step-cut shape can match — while retaining the bold, confident rectangular silhouette that has made it one of the fastest-growing shapes of the decade.
Brilliance
Maximum Brilliance in a Rectangle
The radiant is the most brilliant rectangular diamond shape in existence. Its 70-facet brilliant-cut pattern — the same underlying geometry as a round — produces intense fire, scintillation and light return that the emerald cut, with its step facets, cannot approach. If you love the look of a rectangular diamond but want round-brilliant levels of sparkle, the radiant is your only answer.
Flexibility
Square or Elongated — Your Choice
Like the cushion, the radiant comes in both square (ratio 1.00–1.05) and elongated rectangular (ratio 1.20–1.50) proportions. The square radiant is bold and symmetrical. The elongated radiant creates a finger-lengthening effect similar to an oval or emerald cut — giving you two distinct aesthetics within a single shape category.
Value
Excellent Value Per Carat
Radiant cut diamonds typically cost 15–25% less than a comparable round brilliant. Lower demand relative to rounds and ovals, combined with efficient rough utilisation, makes the radiant one of the best-value brilliant cuts available — without any compromise on sparkle intensity.
Durability
No Vulnerable Points
Unlike princess cuts with sharp 90° corners, pear and marquise shapes with pointed tips, the radiant's trimmed corners eliminate all vulnerable points. You can set a radiant in virtually any ring style without corner-protection concerns — making it one of the most practical rectangular choices for everyday wear.
Versatility
The Best of Both Worlds
The radiant bridges the gap between the step-cut elegance of the emerald and the brilliant-cut fire of the cushion or round. It appeals to buyers who want the clean, rectangular outline of an emerald but find its quiet, reflective character too subdued — and to those who want brilliant sparkle in a more architectural, linear silhouette.
Demand
One of the Fastest-Growing Shapes
The radiant has been one of the fastest-growing diamond shapes in engagement ring demand since 2020, driven by growing appreciation for its unique combination of brilliance and architectural form. Its relative rarity compared to ovals and cushions means a radiant ring stands out — without departing from the clean, rectangular aesthetic that defines modern luxury jewellery.
Expert Advice
Your Guide to Radiant Cut Diamonds
Setting recommendations for certified radiant cut diamonds
The radiant's trimmed corners eliminate the vulnerability that affects princess cuts, pear shapes and marquises — making it one of the most setting-friendly rectangular diamonds available. A 4-prong solitaire works beautifully with both square and elongated radiants, showing off the stone's corners and brilliant faceting without distraction. The trimmed corners mean there are no points to protect, so claw placement is purely aesthetic.
Halo settings amplify the radiant's already impressive face-up size and enhance its brilliant sparkle. Three-stone settings with tapered baguette or trillion side stones are popular choices. The elongated radiant pairs exceptionally well with a thin pavé band — the contrast between the bold rectangular centre and the delicate band is a favourite combination in contemporary engagement ring design.
What to expect to pay for certified radiant cut diamonds
Radiant cuts offer strong value among rectangular shapes. As a general guide at G colour and VS2 clarity: approximately €700–€1,100 for a 0.50ct stone, €1,400–€2,300 for a 1.00ct, €2,500–€4,100 for a 1.50ct, and €5,400–€8,800 for a 2.00ct.
At Diamantwerp, our prices are typically 75% below what you would pay at a traditional jeweller for the same certified stone.
Radiant Cut Diamonds in Antwerp
Antwerp is the world's diamond capital — over 80% of the world's rough diamonds pass through the city's diamond district each year. Buying certified natural diamonds in Antwerp means purchasing direct from the source, with none of the retail markups added by high-street jewellers or international online platforms.
At Diamantwerp, our office on Pelikaanstraat 62 sits at the heart of the Antwerp diamond district, allowing us to source radiant cut diamonds directly from cutters and sight-holders and pass the savings to you.
Radiant Cut Diamonds and certification
Unlike round brilliants — which can achieve a Triple Excellent cut grade from GIA — radiant cut diamonds receive no standardised cut grade. GIA grades radiant cuts on polish and symmetry only. This places the responsibility for evaluating cut quality squarely on the buyer.
The good news: the radiant's brilliant faceting is far more forgiving of proportion variations than the emerald cut's step facets. When assessing a certified radiant, check the length-to-width ratio, table percentage (ideally 61–69%) and depth (61–70%), and ensure the crown and pavilion facets are correctly aligned. Every radiant cut diamond at Diamantwerp comes with a verified certificate from GIA, HRD or IGI — and our team walks you through the proportions before you commit.
Four things to understand before you purchase a certified radiant cut diamond — from choosing between square and elongated proportions, to realistic pricing, to what makes Antwerp the smartest place to buy, and why the radiant's brilliant faceting changes the clarity rules entirely compared to an emerald cut.
Explore More
Other Diamond Shapes
Not sure if this shape suits you? Discover our complete range of different diamond shapes.
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Round
Timeless ClassicThe classic choice with maximum brilliance. 58 facets engineered for unmatched sparkle and fire.
View Round Diamonds -
Oval
TrendingElongated brilliance that flatters the finger. Appears larger than a round of equal carat weight.
View Oval Diamonds -
Cushion
Vintage RomanceSoft rounded corners with a pillow-like shape. Broad facets showcase mesmerising light play.
View Cushion Diamonds -
Princess
Modern ClassicA square silhouette with brilliant-style faceting. Sharp corners and contemporary sparkle.
View Princess Diamonds -
Pear
DistinctiveA teardrop silhouette combining the round's brilliance with the marquise's elongation.
View Pear Diamonds -
Marquise
Regal HeritageA regal boat-shape favoured since 1745. Elongates the finger and maximises visual size per carat.
View Marquise Diamonds -
Emerald
Art DecoStep-cut facets create a hall-of-mirrors effect. Prized for its understated, architectural elegance.
View Emerald Diamonds -
Asscher
Vintage GlamourA square step-cut with deeper facets than an emerald. Signature "hall of windows" effect with Gatsby-era charm.
View Asscher Diamonds -
Heart
Pure SymbolA symbol of love crafted for precision. Requires a master cutter to achieve perfect lobes and pointed tip.
View Heart Diamonds
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.
Client Experiences
What Our Clients Say
Real experiences from clients who purchased certified loose diamonds through Diamantwerp.
Diamantwerp
Out of 5 stars
Overall rating out of 11 Google reviews
Despite some issues with delivery on your side, the product I ordered exceeded my expectations. The quality is at a high level, so overall I am satisfied with the purchase.
Great experience from start to finish. Communication was clear and professional, and the diamond matched the description perfectly. Very satisfied with the quality and overall service. Highly recommended!
Perfecte service, betrouwbaar en Top kwaliteit 👍
Zeer tevreden, hetgeen gevraagd is werd ook uitgevoerd….. top!!!!
Wij hebben onze trouwringen hier besteld en zijn ontzettend tevreden. Vanaf het eerste moment werden we heel vriendelijk en professioneel geholpen. Er werd echt de tijd genomen om naar onze wensen te luisteren en mee te denken over het ontwerp. De service was perfect: duidelijke uitleg, eerlijk advies en een fijne, persoonlijke benadering. We voelden ons echt welkom en begrepen. Het eindresultaat is prachtig geworden. We zijn er enorm blij mee en dragen ze met trots. Absoluut een aanrader voor iedereen die op zoek is naar kwaliteit, vakmanschap en uitstekende service!
Verschillende groottes van parels tentoongesteld, waardoor ik kon kiezen welke perfect bij mij passen. Goede service en top kwaliteit!
Zeer tevreden van mijn trouwring. Exact het design waar ik naar verlangde, kwaliteitsvolle uitvoering en een fijne service.
We kopen hier ondertussen al meerdere jaren onze edelstenen in alle vertrouwen en transparantie. Telkens de overeengekomen kwaliteit aan de best mogelijke prijs, een tevreden klant hier.
Heel professionele en betrouwbare service. Duidelijke uitleg, zonder druk om te beslissen. Alles verliep vlot en correct - zeker een aanrader!
Common Questions
Certified Radiant Cut Diamonds FAQ
Everything you need to know about buying a certified radiant cut diamond.
What is the difference between a radiant and an emerald cut?
The emerald cut is a step cut — its long, parallel facets create the calm, reflective "hall-of-mirrors" effect. The radiant is a brilliant cut — its 70 facets are arranged like a round brilliant's, producing intense fire and scintillation. Both are rectangular, but they look and behave entirely differently: the emerald whispers elegance; the radiant blazes with light. If you want brilliant sparkle in a rectangular outline, choose the radiant. If you prefer architectural depth and transparency, choose the emerald.
Should I choose a square or elongated radiant?
A square radiant (ratio 1.00–1.05) is bold, symmetrical and makes a strong statement — similar in proportion to a princess cut but with trimmed corners and full brilliant faceting. An elongated radiant (ratio 1.20–1.50) creates a finger-lengthening effect similar to an oval or emerald cut and appears larger face-up per carat. The most popular ratio is currently 1.30–1.40. Always verify the ratio on the certificate.
What clarity grade do I need for a radiant cut?
Unlike the emerald cut — where the open step facets expose inclusions clearly — the radiant's brilliant faceting scatters light and masks inclusions effectively. VS2 or SI1 is the sweet spot for most buyers: both typically face up eye-clean in a radiant cut, at a meaningfully lower price than VVS grades. You do not need to pay the clarity premium required for an emerald cut. Read our full guide on diamond clarity.
What colour grade should I choose for a radiant cut diamond?
The radiant's brilliant faceting handles colour better than step cuts, but its rectangular outline can concentrate tints in the corners — making lower colour grades slightly more visible than in a round. For a white appearance in platinum or white gold, G or H colour is the sweet spot. F or above for a larger stone (1.50ct+) in a high-exposure setting. In a yellow gold setting, I–J is acceptable and saves considerably. Read our full guide on diamond colour.
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. The same certified loose diamonds from Antwerp, at a fraction of the price. Browse diamonds by budget: under €2,000, under €5,000 or under €10,000.
Is a radiant cut diamond suitable for an engagement ring?
The radiant is one of the most versatile and practical rectangular choices for an engagement ring. Its trimmed corners eliminate the chip risk that affects princess, pear and marquise shapes — and its brilliant faceting produces a level of sparkle that a cushion or emerald cut cannot match.
Square radiants make a bold, confident statement and suit buyers who find round diamonds too conventional and emerald cuts too quiet. Elongated radiants offer the finger-slimming elegance of an oval with a more architectural, linear outline. We recommend a minimum of 0.50ct so the rectangular outline reads clearly, with 0.70ct or above being the most popular choice for solitaire settings.
