Certified Round Diamonds — Antwerp
The world's most popular diamond shape — unmatched brilliance, fire and scintillation in every certified stone.
57
FACETS
75%
Market Share
1919
Perfected
Our Current Stock
Certified Round Diamonds
Hand-picked certified stones from our Antwerp inventory — GIA, HRD & IGI graded. Prices up to 75% below retail.
Expert Advice
Why Choose Certified Round Diamonds?
The round brilliant cut is the most popular diamond shape in the world, accounting for approximately 75% of all diamonds sold. Developed over centuries and perfected by Marcel Tolkowsky in 1919, this 57-facet design maximises the return of light like no other shape.
Brilliance
Unmatched Light Performance
No other diamond shape returns as much light to the eye. The round brilliant's 57 facets are precisely calibrated for maximum brilliance, fire and scintillation.
Value
Best Value for Visual Size
Flexibility
Forgiving on Lower Grades
Investment
Highest Resale Value
Grading
Achieve Highest Grading
The round brilliant is the only shape that consistently achieves a Triple Excellent grade — the highest cut rating awarded by GIA.
Objectivity
Standardised Cut Grading
Expert Advice
Your Guide to Round Diamonds
Setting recommendations for round brilliants
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 round diamonds in Antwerp means buying direct from the source, without the retail markups that come with jewellers or international online platforms. At Diamantwerp, our office sits at the heart of the district, allowing us to source round brilliants directly from cutters and sight-holders and pass the savings to you.
What to expect to pay for certified round diamonds
The round brilliant suits virtually every ring setting. The most popular choices are the classic 4- or 6-prong solitaire, which maximises light entry and shows off the stone's brilliance. A halo setting adds visual presence and makes the centre stone appear larger. Pavé bands complement the round's symmetry without competing with it. For those looking for maximum sparkle, a triple excellent cut round brilliant set in a thin platinum band remains the timeless benchmark.
Round Brilliant Diamonds in Antwerp
Price depends heavily on the 4 C's, but as a general guide: a well-cut round brilliant at G colour and VS2 clarity will cost approximately €1,200–€1,800 for a 0.50ct stone, €2,500–€4,000 for a 1.00ct, and €8,000–€14,000 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.
Round diamonds and certification
Because the round brilliant is the only shape for which GIA issues a full cut grade, certification matters more for this shape than any other. A GIA Excellent cut round is a measurable, objective standard — not a subjective claim. When buying a certified round diamonds, always verify the certificate number on the lab's website before purchase. Every stone at Diamantwerp comes with a certificate from GIA, HRD or IGI.
Whether you are buying a round brilliant for an engagement ring, as a gift, or as a long-term investment, purchasing a certified stone from a verified Antwerp dealer is the single most important step you can take to protect both its value and your confidence in the purchase.
Explore More
Other Diamond Shapes
Not sure if this shape suits you? Discover our complete range of different diamond shapes.
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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 -
Radiant
Bold BrillianceA rectangular silhouette with brilliant-cut sparkle. Created in 1977 for modern fire in a classic shape.
View Radiant 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 Round Diamonds FAQ
Everything you need to know about buying a round brilliant diamond.
Why is the round brilliant the most expensive shape?
Round brilliants require the most rough diamond waste during cutting — up to 50% of the original stone is lost. Combined with the highest demand of any shape, this makes them the premium option. However, at Diamantwerp we offer certified round diamonds (GIA, HRD Antwerp, or IGI) at up to 75% below traditional retail prices.
What is the ideal cut grade for a round brilliant?
We recommend 'Excellent' or 'Very Good' cut grades for round brilliants. Cut has the greatest impact on a diamond's beauty — more than colour or clarity. Read our cut guide for details.
What colour grade should I choose?
For a round diamond, grades D–F are colourless and command a premium. Grades G–H offer excellent value — they face up white and are virtually indistinguishable from colourless grades to the naked eye. Read our colour guide.
What clarity grade should I choose for a round brilliant?
For a round brilliant, VS2 or SI1 offer the best value. The brilliant facet pattern disperses light so effectively that small inclusions are far harder to see than in step-cut shapes like emerald or asscher. A well-cut round at SI1 will face up eye-clean in the vast majority of cases — at a significantly lower price than VVS grades. We recommend avoiding SI2 without viewing the stone first, as clarity can vary within the same grade. Read our clarity guide for the full breakdown.
What is a Triple Excellent grade and should I insist on it?
Triple Excellent (3EX) is the highest cut grade awarded by GIA — it means the diamond scores Excellent in cut, polish and symmetry simultaneously. It is only available for round brilliants, because GIA only issues a cut grade for the round brilliant shape; no other shape can achieve a certified 3EX.
For a round brilliant, we recommend Excellent or Very Good cut as a minimum — cut is the single biggest driver of brilliance and fire, more than colour or clarity. That said, Triple Excellent is not always necessary. A well-cut Excellent/Very Good stone with strong light performance can be visually indistinguishable from a 3EX at a lower price point. Where 3EX matters most is if you're buying as an investment, or if you want the highest possible resale value — 3EX rounds command a premium on the secondary market and are always easier to sell.
Our recommendation: prioritise Excellent cut, then check the Hearts & Arrows pattern or AGS light performance report if available. If 3EX fits your budget, take it — but don't sacrifice colour or clarity to chase the grade.
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 loose diamonds, fraction of the price.
Browse diamonds by budget: under €2,000, under €5,000 or under €10,000.
