Round Brilliant Cut Diamonds
The timeless classic.
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.
Every loose round brilliant diamond in our collection is GIA, HRD or IGI certified and individually selected for superior cut quality. Because of its ideal symmetry, the round brilliant offers the most consistent and measurable brilliance — making it the benchmark by which all other shapes are judged.
Facets
Market share
Perfected
Symmetry
What makes it special
Key Characteristics
Maximum Brilliance
57 precisely angled facets are mathematically optimised to reflect the maximum amount of white light back to the eye.
Superior Fire
Disperses white light into spectral colours more effectively than any other shape — those rainbow flashes are fire.
Hides Inclusions
The brilliant facet pattern helps mask inclusions and slight colour tints, allowing you to choose lower grades without sacrificing beauty.
Versatile Setting
Works beautifully in every setting style — from classic solitaires to modern halo designs and three-stone arrangements.
Our Collection
Round Brilliant Diamonds
Hand-picked certified round brilliant diamonds from our current stock — at prices up to 75% below retail.
Expert Advice
Why Choose a Round Brilliant?
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.
Best Value for Visual Size
Forgiving on Lower Grades
Highest Resale Value
Standardised Cut Grading
Explore More
Other Diamond Shapes
Not sure if a round brilliant is right for you? Explore our complete range of certified diamond shapes
Oval
Trending
Elongated brilliance that flatters the finger. Appears larger than a round of equal carat weight.
Cushion
Vintage Romance
Soft rounded corners with a pillow-like shape. Broad facets showcase mesmerising light play.
Princess
Modern Classic
A square silhouette with brilliant-style faceting. Sharp corners and contemporary sparkle.
Emerald
Art Deco
Step-cut facets create a hall-of-mirrors effect. Prized for its understated, architectural elegance.
Pear
Distinctive
A teardrop silhouette combining the round's brilliance with the marquise's elongation.
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.
COMMON Questions
Round Brilliant FAQ
Everything you need to know about buying a round brilliant diamond.
About Round Brilliants
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 round brilliants 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.
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. Learn more about our certification standards.
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.
Can I view the diamond before buying?
Absolutely. Whether you want to buy online or in person, 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.
