Jul 29, 2026

Diamond Shapes Explained: A Guide to Cuts and What Suits You

Ask someone what kind of diamond they want and the answer is usually a shape. Round, oval, emerald. Shape is the most personal choice in the whole process, because it sets the character of the ring more than anything else. Here is a run through the most popular diamond shapes, what each one is known for, and who tends to love it.

Round brilliant

The classic, and by far the most popular. The round brilliant is cut to maximise sparkle, so it throws more light than any other shape. If someone loves fire and flash and cannot go wrong with tradition, round is the safe and stunning choice.

Oval

Oval has surged in popularity, and for good reason. It has the sparkle of a round but an elongated outline that flatters the finger and makes it look longer and slimmer. An oval also tends to look larger than a round of the same carat weight, so it feels like more diamond for your money.

Emerald

Emerald cut is for the person who likes clean and understated over maximum sparkle. Instead of fire, it gives long, elegant flashes of light, like looking into a hall of mirrors. It is sophisticated, a little vintage, and shows off the clarity of the stone, so it pairs best with a cleaner diamond.

Radiant

Radiant is the best of both worlds. It has the clean rectangular outline of an emerald cut but is faceted like a round brilliant, so it sparkles hard. A great pick for someone who wants a modern shape without giving up fire.

Cushion

Cushion is a square or rectangular shape with softly rounded corners, like a pillow, which is where the name comes from. It is romantic and slightly vintage, with a warm, glowing sparkle rather than the sharp flash of a round. It suits someone after a softer, timeless look.

Portuguese and specialty cuts

Beyond the classics there are specialty cuts like the Portuguese cut, which packs in extra rows of facets for an intense, distinctive sparkle. Shapes like these are for the person who wants something few other people will have.

So which shape should you choose

There is no better or worse shape, only the one that suits the person wearing it. If they love sparkle, lean round or radiant. If they love elegant and understated, emerald. If they want their diamond to look as large as possible, oval is hard to beat. And if you are not sure, round never disappoints.

You can see all of these shapes in the metal across our lab grown diamond engagement rings. If you want a hand thinking through the whole decision, not just the shape, our guide on how to choose a lab grown diamond engagement ring walks through the rest.