A Complete Guide to Diamond Shapes and Their Unique Characteristics

The shape of a diamond is the very first thing anyone notices about it. Before you get into grades and certificates, before you even think about the setting, it's the outline of the stone that catches your eye and says something about the person wearing it. And with so many different types of diamond shapes out there, choosing one can feel like a big decision, because it kind of is.

At Vangeli Jewellery, we've been hand-selecting stones and crafting diamond rings around them in Canberra since 1978, so we've watched a lot of people fall in love with a shape they didn't expect. This guide walks through the main shapes of diamond rings, what makes each one special, and how to figure out which suits you.

Shape vs. Cut - They're Not the Same Thing

Quick clarification first, because people mix these up constantly (understandably). Diamond shape is the outline of the stone when you look down at it from above round, oval, pear, and so on. Diamond cut is about how well the stone has been faceted, proportioned, and polished so it handles light properly. So you can have a round shape with an average cut, or a round shape with a stunning cut. Shape sets the style. Cut decides the sparkle. Keep them separate in your head and everything else gets easier.

Broadly, the cuts of diamonds split into two families: the classic round brilliant, and everything else, which the trade lumps together as "fancy shapes."

Round Cut Diamonds

The most popular by a mile round cut diamonds account for roughly three-quarters of all diamonds sold. There's a reason. With 57 or 58 facets and a fully symmetrical form, the round brilliant is engineered to throw back more light than any other shape. If maximum sparkle is what you're after, this is it.

It's also the safe-in-a-good-way choice: works with any hand, any setting, from a plain solitaire to a halo. The one catch is cost. Because round diamonds waste more of the rough stone during cutting and they're in such demand, you pay a premium per carat compared to fancy shapes. Worth it for a lot of people, but good to know going in.

Oval Diamonds

An oval is basically a round that's been gently stretched. You keep most of that brilliant sparkle, but the elongated silhouette makes the stone look bigger than a round of the same carat weight, and it tends to make the finger look longer and slimmer too. That combination has made ovals hugely popular in the last few years, and honestly I don't see it slowing down.

Princess Cut

Square outline, sharp 90-degree corners, tons of fire. The princess is the most popular of the square shapes and a favourite for people who want something a bit more modern than a round but still very sparkly. Bonus: it's an efficient cut, so you often get more diamond for your money. Just protect those pointed corners with a setting that shields them, since they can chip.

Emerald Cut

Now for something completely different. The emerald cut is a step cut, not a brilliant one, meaning long straight facets arranged in rows rather than lots of tiny sparkly ones. Instead of fireworks, you get this elegant "hall of mirrors" effect - flashes of light and dark, very sophisticated, very understated. One thing to know: because the table is so open and clear, inclusions and colour show more easily, so emerald cuts reward a higher clarity grade. Learn more about that in our guide to the 4 Cs of diamonds.

Cushion Cut

A square or rectangular shape with soft, rounded corners like a little pillow, which is where the name comes from. Cushion cuts have a romantic, slightly vintage feel and hold their sparkle beautifully. They've been around for centuries and keep coming back into fashion. A lovely choice if you want something classic but not quite as expected as a round.

Pear and Marquise

Both of these are elongated shapes with pointed ends, and both make a diamond look larger for its weight. The pear (or teardrop) is round on one end, pointed on the other soft and elegant. The marquise is pointed at both ends, football-shaped, and has a great story attached: legend says it was created for King Louis XIV of France. Both flatter the hand and stand out from the crowd.

Heart Shaped Diamonds

The most romantic of the lot, obviously. Heart shaped diamonds are essentially a pear cut with a cleft at the top, and they take real skill to cut well the two halves have to be perfectly symmetrical or the whole thing looks off. Because of that, they're less common, which is part of the appeal for people wanting something genuinely personal. Best seen at slightly larger carat sizes so the heart reads clearly.

Asscher and Radiant

Two more worth knowing. The Asscher is like a square emerald cut same step-cut mirror effect, cropped corners, very art-deco. The radiant blends the emerald's outline with brilliant-cut facets, so you get straight edges and serious sparkle. A nice middle ground if you can't decide.

How to Choose Your Diamond Shape

There's no single right answer that's the honest truth. It comes down to personality, lifestyle, budget, and what looks good on the hand. A few things I'd think about: elongated shapes (oval, pear, marquise, emerald) look larger and flatter shorter fingers; round and princess give the most sparkle; step cuts like emerald and Asscher lean elegant over flashy. And always try a few on. A shape that looks amazing in photos can feel totally different on your own hand.

If you'd rather not guess, come see us. Our team can show you shapes side by side and even create something bespoke through our custom jewellery design service. You can also browse our engagement rings collection or book an appointment to see stones in person.