Collection: Bagues en diamant rond

The round brilliant cut is the most precisely engineered diamond cut in existence — developed through centuries of gemological science to reflect the maximum possible light back through the crown of the stone. A perfectly cut round brilliant produces the characteristic sparkle of bright flashes, coloured fire, and scintillating movement that makes a round diamond engagement ring instantly recognisable from across a room.
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A round diamond solitaire engagement ring is the definitive expression of fine jewellery — one certified round brilliant diamond, one perfect setting, an uninterrupted focus on the beauty of a single exceptional stone. Browse round diamond solitaire engagement ring, solitaire round diamond ring, round solitaire diamond ring, diamond solitaire ring round, and round brilliant cut solitaire diamond ring.
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A round diamond halo engagement ring surrounds the centre round brilliant with a continuous border of smaller accent diamonds — amplifying the apparent size of the centre stone and creating a ring of extraordinary, continuous sparkle. The circular halo mirrors the round outline of the stone perfectly, creating a seamless, cohesive design.
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Round diamond engagement rings with baguette side stones create one of the most distinctive and glamorous combinations in fine jewellery — the step-cut rectangular baguettes flank the round brilliant centre stone, adding geometric contrast and an unmistakably Art Deco-influenced aesthetic that is one of the most sought-after contemporary ring styles.
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A three stone round diamond engagement ring places three brilliant-cut round diamonds side by side — symbolising your past, present, and future while delivering extraordinary continuous brilliance across the full width of the band. Browse three stone round diamond ring, 3 stone round diamond ring, round three stone diamond ring, three round diamond engagement ring, 3 round diamond engagement ring, three stone round diamond engagement ring, round diamond three stone engagement ring, and 3 stone round diamond engagement rings. Also: pear and round diamond ring and marquise and round diamond engagement ring for mixed-shape three stone designs.

Carat weight determines the physical size of your round diamond, but cut quality determines how much of that size translates into brilliance. A perfectly cut 1 carat round brilliant will outshine a poorly cut 1.5 carat diamond every time — so carat and cut always need to be considered together.
At half a carat, a round diamond measures approximately 5.2mm in diameter — delicate, refined, ideal for those who prefer understatement. At one carat the stone reaches 6.5mm — the most popular size in our collection, striking the ideal balance between presence and everyday wearability. One and a half carats brings you to 7.4mm — noticeably more impressive while remaining completely wearable. Two carats reaches 8.1mm and makes a clear, confident statement on the hand. Two and a half carats at 8.8mm is one of the most rewarding carat weights — significantly more presence than a 2 carat without the jump in price of a full 3 carat stone. At three carats and 9.4mm diameter, a round brilliant engagement ring becomes genuinely spectacular — our most searched larger size. From four carats upward, the round diamond becomes the centrepiece of every room.

The metal you choose for a round diamond engagement ring is as personal a decision as the diamond itself. Yellow gold — in 14k and 18k — gives a round brilliant a warm, classic setting that has been the standard in fine jewellery for centuries. The contrast between the warm gold and the bright white diamond creates a look that is simultaneously traditional and striking. White gold delivers a clean, contemporary setting that enhances the diamond's brightness and suits a cooler, more minimal aesthetic. Rose gold adds warmth of a different kind — romantic, distinctive, and increasingly popular for buyers who want their ring to feel personal rather than conventional.
Platinum is the premium choice. Harder than gold, naturally white without plating, and the most secure metal for holding a diamond — platinum enhances the round brilliant's white sparkle without any warm-toned interference. It is the metal most often chosen for exceptional diamonds, and the one we most often recommend for stones above two carats.

A lab grown round diamond is chemically, physically, and optically identical to a natural round diamond. The same carbon crystal structure, the same refractive index, the same hardness — the only difference is where it was created. Lab grown diamonds carry full IGI and GIA certification and are graded on exactly the same colour and clarity scale as natural diamonds.
For buyers choosing a round diamond engagement ring, lab grown offers one decisive advantage: at the same budget, you can typically access a stone that is 50-70% larger or higher in quality than an equivalent natural diamond. A buyer who could afford a natural 1 carat round brilliant can generally access a certified lab grown 1.5 or 2 carat round at the same price point. Our lab grown round diamond engagement rings are available in every setting, metal, and carat weight alongside our natural diamond collection.

A round diamond engagement ring pairs naturally with a round diamond wedding band — the shared circular motif of round brilliants creates a continuous, cohesive sparkle across both rings when worn together. Our round diamond wedding rings are designed to sit flush alongside our engagement rings, with matching metal and diamond profiles that create a seamless bridal set.
For those who want to mark a significant anniversary or upgrade their existing bridal set, our round diamond eternity rings feature a full or half circle of round brilliant diamonds in matching carat weights. Ring enhancers and ring jackets are available for buyers who want to frame an existing round diamond solitaire with additional stones — transforming a classic engagement ring into a more elaborate bridal look without replacing the original.

The setting holds your round diamond in place and defines how light enters and leaves the stone. Choosing correctly is as important as choosing the diamond itself.
A prong setting — the most popular choice for round diamonds — lifts the stone above the band using four or six metal claws, allowing light to enter the stone from below as well as above. Six prongs provide maximum security; four prongs expose slightly more of the stone and create a marginally more open, modern look. A bezel setting encircles the round diamond in a continuous metal rim — the most secure option available and ideal for active lifestyles. A pave setting lines the band with small round diamonds, creating a continuous sparkle that connects the centre stone to the ring itself. A channel setting recesses diamonds into the band for a smooth, snag-free finish.
Our ring settings for round diamonds are available as complete rings and as settings only — allowing buyers who already own a round brilliant diamond to commission a bespoke mount in any style and metal.