More Than Just a Shape

A diamond shape is one of the first decisions you will make when shopping for a diamond—and one of the most personal. Shape is not about quality or light performance. It is about what catches your eye, what looks right on your hand, and what speaks to you. This guide covers the most popular diamond shapes, their characteristics, and how to choose the one that is right for you.

Round Brilliant

The round brilliant is the most popular diamond shape, accounting for approximately two-thirds of all diamond sales. It was engineered for maximum brilliance: 58 facets cut in a precise arrangement that returns more light than any other shape.

Why It Is Popular

The round brilliant is popular because it is the most sparkly and versatile shape. It suits almost any setting, from classic solitaires to elaborate halos, and looks beautiful on every hand size and shape. It works for wedding rings, engagement rings, anniversary bands, and right-hand rings alike.

The Trade-Off

The round brilliant is the most expensive shape per carat because the cutting process wastes more of the rough diamond. You pay a premium for the brilliance, but you also get the most light return of any shape.

Oval

The oval is a modified brilliant cut with an elliptical shape that offers brilliance similar to the round brilliant but with a distinctive silhouette. It has become increasingly popular over the past decade as an alternative to the classic round.

Why Choose an Oval

The oval offers two advantages over the round: it appears larger than a round of the same carat weight due to its elongated shape, and its length can make fingers look longer and more slender. It is a flattering choice for someone who loves the sparkle of a round but wants something slightly different.

The Bow Tie Effect

Ovals (and other elongated shapes) can exhibit a bow tie pattern—a dark zone across the center where light does not reflect properly. A well-cut oval will have minimal visible bow tie. When shopping for an oval, look at it from the top to confirm the bow tie does not dominate.

Pear

The pear (also called teardrop) is a hybrid shape that combines the rounded bottom of a round brilliant with the pointed top of a marquise. It is elegant, distinctive, and incredibly versatile.

How to Wear It

The pointed end of the pear traditionally points toward the hand, which creates a elongating effect on the finger. However, some wearers prefer the pointed end pointing outward for a more dramatic look. There is no wrong way to wear a pear—wear it whichever way looks best to you.

Symmetry Matters

The pear requires excellent symmetry to look its best. The two halves of the shape should mirror each other perfectly. When evaluating a pear diamond, draw an imaginary line down the center and compare the two sides. Any visible asymmetry will be noticeable.

Emerald

The emerald cut is a step cut rather than a brilliant cut. Instead of small, numerous facets, it features long, flat facets that step inward like the edges of a staircase. This creates a hall-of-mirrors effect rather than the intense sparkle of a brilliant cut.

The Aesthetic

Emerald cuts are for those who value elegance and sophistication over sparkle. They have a quiet, understated beauty that appeals to someone who does not need their diamond to shout. The large, open facets also mean that any inclusions or color will be more visible than in a brilliant cut.

What to Look For

Because the open facets reveal more than a brilliant cut, clarity is particularly important for emerald cuts. Look for VS1 or higher clarity and G or higher color. The proportions also matter: a well-cut emerald will have symmetrical step patterns and no windowing (areas where light passes through without reflecting).

Princess

The princess cut is the most popular fancy shape (non-round) and the second most popular diamond shape overall. It is a modified brilliant cut with a square or slightly rectangular shape and sharp, angular corners.

Brilliance and Durability

The princess cut returns nearly as much light as a round brilliant, making it one of the sparkliest fancy shapes. Its angular corners also make it more durable for daily wear than shapes with pointed corners (like marquise or pear) because there are no vulnerable tips to chip.

Setting Considerations

Princess cuts are most commonly set in a four-claw setting that protects the corners, or a channel setting for anniversary bands. The corners are the most vulnerable part and should always be protected by a claw or channel wall.

Asscher

The Asscher cut is similar to the emerald cut but square rather than rectangular. It has a distinctive Art Deco aesthetic that appeals to those who love vintage-inspired design. Like the emerald, it is a step cut with long, linear facets.

The Hall of Mirrors

Asscher cuts create the same hall-of-mirrors effect as emerald cuts, but the square shape concentrates it into a more compact, jewel-like appearance. They are often set in vintage-inspired settings with milgrain detailing and filigree.

Rarity

Asscher cuts are less common than emeralds and princesses, which makes them a distinctive choice for someone who wants something less mainstream. They pair particularly well with Art Deco and Art Nouveau inspired wedding rings.

Cushion

The cushion cut (also called pillow cut) has rounded corners and larger facets that give it a soft, pillow-like appearance. It was the most popular diamond cut for over a century before the round brilliant took over in the early 20th century.

The Warm Sparkle

Cushion cuts do not sparkle as intensely as round brilliants. Instead, they produce a warm, chunky brilliance that some describe as a glow. This makes them particularly beautiful in antique-style settings and with warm-colored metals like yellow gold.

Modern vs. Classic Cushion

Modern cushion cuts have better light return than older versions, thanks to improved cutting techniques. If you want a cushion with maximum brilliance, look for a modern cushion with defined facet patterns. Antique cushions have a softer, more romantic appearance that many buyers prefer for vintage-inspired rings.

Radiant

The radiant cut is a rectangular or square shape with cropped corners, combining the look of an emerald cut with the brilliance of a round. It is a versatile shape that works well in both classic and modern settings.

The Best of Both Worlds

If you want the elegance of a step cut but the sparkle of a brilliant cut, the radiant is an excellent choice. It has more facets than an emerald or Asscher, which gives it significantly more brilliance while maintaining the rectangular silhouette.

Color Considerations

Radiant cuts are excellent at concealing color, making them a good choice if you want to pair a lower color grade with a warm metal setting. They also look beautiful in yellow gold, where the warmth of the setting complements the diamond.

Marquise

The marquise is an elongated shape with pointed ends, named after the Marquise de Pompadour, who allegedly commissioned a diamond cut to match the shape of her lips. It is a romantic, dramatic shape that maximizes carat weight along the finger.

The Elongating Effect

The marquise is one of the most flattering shapes for fingers because its elongated silhouette makes the finger appear longer and more slender. It is an excellent choice for someone who wants a large-looking diamond without the cost of a round brilliant.

Vulnerability at the Points

The pointed ends of a marquise are vulnerable to chipping and should always be protected by a V-shaped prong or claw setting. When evaluating a marquise, check that both points are well-protected and that the shape is symmetrical.

Heart

The heart is the ultimate symbol of love and the most romantic of all diamond shapes. It is a pear-shaped diamond with a cleft at the top, requiring exceptional precision to cut correctly.

Symmetry Is Everything

A heart diamond must be perfectly symmetrical to look its best. The two halves should be mirror images of each other, with the cleft (the split between the two lobes) centered precisely. Any asymmetry will be immediately visible and detract from the shape.

Setting Style

Heart diamonds are typically set in solitaires to let the shape dominate. They look beautiful with diamond halos or side stones, but the setting should never compete with the shape itself.

Choosing Your Shape

There is no objectively best diamond shape—only the one that is right for you. Consider these factors:

• Personal style: Classic and traditional? Round brilliant. Romantic and vintage? Cushion or Asscher. Modern and bold? Emerald or radiant.
• Finger shape: Elongated shapes (oval, marquise, pear) flatter shorter fingers. Softer shapes (round, cushion) balance wider fingers.
• Setting: Some shapes pair better with specific settings. A round brilliant works with almost anything; a heart needs a simple solitaire.
• Budget: If maximizing size for your budget matters, consider marquise, oval, or pear—they all appear larger than round diamonds of the same weight.

At Aranc

We offer all major diamond shapes in our lab-grown diamond collection. Our team can help you compare shapes, evaluate quality, and find the perfect cut for your setting and budget.