Diamond Cut Shapes: The Complete Visual Guide

Choosing a diamond shape is one of the most personal decisions in the whole design process. It sets the character of a ring before a single other detail is chosen, and it quietly shapes how the stone catches light, how large it looks on the hand, and how forgiving it is of the tiny natural marks found in almost every diamond.

To make sense of it all, it helps to group the common shapes by how they are cut. Every diamond shape belongs to one of three cutting families, and once you understand the family, you understand the shape. Here is the complete picture, family by family.

The three cutting families

Diamond shapes fall into three groups, and the group tells you most of what you need to know about how a stone will behave.

• Brilliant cuts — round, oval, pear, marquise, cushion, radiant, princess and heart. These are cut with many triangular and kite-shaped facets arranged to bounce light back at you as bright, sparkling flashes.
• Step cuts — emerald, asscher and baguette. These have long, parallel facets arranged like the steps of a staircase, giving a calmer, more mirror-like play of light.
• Mixed cuts — radiant and princess combine both approaches, pairing the outline of a step cut with brilliant-style faceting inside.

Keep those three families in mind and the rest of this guide falls into place.

Brilliant cuts: maximum sparkle

Brilliant cuts are what most people picture when they think of a diamond. The faceting is designed to hide light and return it as fire and scintillation, which is why these shapes read as lively and bright.

The round brilliant is the classic, but the family is wide. Ovals, pears and marquises take that same sparkle and stretch it into an elongated outline. Cushions soften the whole thing with gently rounded corners, while the heart is a romantic variation on the same faceting.

Because all those facets break up the light, brilliant cuts are the most forgiving of the small inclusions found inside natural stones. The busy sparkle draws the eye away from tiny marks, so a brilliant cut can look clean even when a stone carries a few natural features.

Two of the most-loved brilliant comparisons deserve a closer look. If you are torn between two elongated shapes, our guide to marquise versus pear walks through how each sits on the finger. And if you are weighing a classic circle against a softer ellipse, oval versus round brilliant compares the two side by side.

Step cuts: quiet elegance

Step cuts take a completely different path. Instead of scattering light into sparkle, their long, straight facets create broad flashes and a clear, glassy depth — an effect often described as a hall-of-mirrors look. The result is understated and architectural, and it suits people drawn to clean lines rather than fireworks.

The emerald cut is the best known: a rectangular outline with cropped corners and those distinctive parallel steps. The asscher is its square cousin, and the baguette is a slim rectangle often used beautifully as a side stone.

The trade-off is honesty. Because step cuts have those large, open facets and less sparkle to distract the eye, they are the least forgiving of inclusions. Any natural marks are easier to see through that open, mirror-like table, which is worth bearing in mind as you choose a stone to sit within one.

Emerald and radiant cuts are often confused because they share a similar outline, yet they belong to different families and behave very differently in the light. Our comparison of radiant versus emerald untangles exactly that.

Mixed cuts: the best of both

Mixed cuts sit between the two. The radiant and the princess pair a step-cut outline with brilliant-style faceting inside, so you get crisp geometry on the outside and plenty of sparkle within.

The princess is a sharp-cornered square, all modern angles, while the radiant softens its corners a little. Because they carry brilliant faceting, mixed cuts share much of that family's ability to disguise small inclusions, which makes them a practical as well as a beautiful choice.

Which shape looks biggest?

This is one of the questions we are asked most often, and the honest answer is that it depends on how the shape spreads its weight. For a given size of stone, elongated shapes tend to look larger because more of the diamond is presented face-up to the eye.

The elongated brilliant shapes — oval, pear and marquise — carry their outline across a longer surface, so they can appear more generous than a compact round or square of similar weight. Emerald cuts also have a large, open table that gives a spread-out, roomy impression.

There is a lovely secondary benefit to those elongated shapes. Set the long way along the finger, they draw the eye down the hand and create a subtly lengthening, slimming effect that many people find very flattering. An oval, a marquise, a pear or an emerald can all make fingers look longer and more elegant.

How to choose your shape

There is no single right answer, only the shape that feels like yours. A few gentle questions help:

• Do you want sparkle or serenity? Brilliant cuts for lively fire, step cuts for calm, clear elegance, mixed cuts for a bit of both.
• Do you want the stone to read large? Lean towards an elongated shape.
• Do you love the idea of a lengthening effect on the hand? Again, an elongated shape set north-to-south.
• How much do inclusions worry you? Brilliant and mixed cuts are the most forgiving; step cuts ask for a cleaner stone.

These are starting points, not rules. The joy of a bespoke piece is that your ring can be built around the shape you fall for, rather than the other way around.

Seeing shapes in person

Photographs only take you so far. The same shape can feel quite different once it is in your hand, catching the light of the room and sitting against your own skin. Seeing a few side by side is often the moment everything becomes clear.

That is where our design studio comes in. Whether you visit our showroom at 64 South Street, Chichester, or have our specialist travel to you across West Sussex, Surrey, Hampshire and Greater London, we can talk you through the families in person and help you find the shape that feels right. Every piece is designed with you and made in our UK workshop, at an unhurried pace.

Start with the shape you love

If a particular shape has caught your eye, that is the perfect place to begin. Explore the possibilities with our online Custom Jewellery Builder, and let us help you turn a shape you love into a piece you will treasure. Tell us your idea — we would love to hear it.