Choosing the shape of an engagement ring diamond is the most personal decision in the whole process. It sets the style of the ring, affects how large the stone looks and changes how it sparkles. Here are the shapes couples choose most, and why.
Round brilliant: the timeless classic
The round brilliant is engineered for maximum sparkle, and it has been the world's best-selling shape for decades. It suits every setting and every style. Choose it if you want the most brilliance and a look that will never date.
Oval: the modern favourite
Ovals have surged in popularity. They have almost the sparkle of a round, look larger per carat because of their elongated outline, and make fingers look slender. Check for a "bow-tie" (a dark band across the middle) when choosing one.
Emerald cut: quiet elegance
With long step facets and a rectangular outline, the emerald cut shows off clarity and gives a "hall of mirrors" effect rather than sparkle. Because inclusions are more visible, choose higher clarity, which is far more affordable with laboratory-grown diamonds.
Pear: romantic and distinctive
Part round, part marquise, the pear shape is feminine and flattering. Wear it point towards the fingertip for an elongating effect.
Cushion: soft and vintage
A square or rectangular shape with rounded corners and large facets. Popular in halo settings for a vintage look.
Radiant and princess: modern brilliance
Square and rectangular shapes with brilliant faceting, for couples who want a modern outline with plenty of sparkle.
Marquise: bold and elongated
The marquise has the largest surface area per carat of any shape, making it look impressively big.
Which shape looks biggest?
For the same carat weight, marquise, oval and pear typically look largest, followed by emerald and round. Laboratory-grown diamonds make it easier to go up a size in any shape.
Explore further
See every shape in detail on our diamond shapes page, browse engagement ring styles, or read our ring shape guide.
