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Diamond engagement rings set with different shaped center stones.

Diamond Shape

When choosing your diamond, which shape are you most drawn to? Here's a deep dive into what makes your favorites so eye-catching.

What is Diamond Shape?

Diamond shape refers to the geometric appearance and outline of your diamond. It's the physical and visual shape of the stone. Every diamond shape has unique attributes that impact sparkle and overall look. 


Shape is often one of the first attributes considered when shopping for a diamond. While round diamonds are the most traditional choice, many people are also drawn to the distinctive look of non-round or fancy-shaped diamonds. Fancy-shaped diamonds include oval, cushion, princess, pear, emerald, marquise, asscher, radiant, and heart-shaped diamonds. 

Learn About Diamond Shapes

Round-Shaped Diamonds

Round diamonds, today's most popular shape, are uniform and symmetrical. As a brilliant cut, they are precisely cut to feature over 56 facets that allow for optimal sparkle.

Engagement ring set with a round shaped diamond.

Oval-Shaped Diamonds

A scintillating twist on the classic round brilliant, this elongated shape can create the illusion of larger size while exhibiting a similar fire and brilliance. Oval diamonds are highly versatile and remarkably elegant.

Engagement ring set with an oval shaped diamond.

Cushion-Shaped Diamonds

Soft, rounded edges differentiate cushion-cut diamonds from more angular square or rectangular shapes. Cushion-cut diamonds are a timeless, romantic choice refined over centuries from the old mine-cut.

Engagement ring set with a cushion shaped diamond.

Princess-Shaped Diamonds

Princess-cut diamonds are known for their four-pointed corners. Contemporary with a classic sparkle, princess-cut diamonds are square and feature over 70 facets that create exceptional fire and scintillation.

Engagement ring set with a princess shaped diamond.

Pear-Shaped Diamonds

Pear-cut diamonds feature a rounded edge tapering to a point at the opposite end, forming a teardrop shape. This elongated shape flatters fingers like an oval-cut, showcasing the stone's distinctive sparkle.

Engagement ring set with a pear shaped diamond.

Emerald-Shaped Diamonds

Emerald-cut diamonds are the most popular step-cut shape, treasured for their understated elegance and striking silhouette. The shallow pavilion and open table accentuate the stone's clarity, while the rectangular facets offer a subtle reflective shimmer.

Engagement ring set with an emerald shaped diamond.

Marquise-Shaped Diamonds

Marquise-shaped diamonds feature dramatic pointed ends with a curved middle, creating a large surface area. This unique cut maximizes perceived size while elongating and flattering fingers. This romantic shape originated in the 18th century and offers a regal elegance that stands the test of time.

Engagement ring set with a marquise shaped diamond.

Asscher-Shaped Diamonds

Like an emerald-cut, asscher-cut diamonds offer the brilliant shimmer of a step-cut stone. These diamonds feature a square shape with cut corners, making them uniquely chic in a contemporary setting while also perfectly complementing vintage styles.

Engagement ring set with an asscher shaped diamond.

Radiant-Shaped Diamonds

The radiant-cut diamond is a hybrid, combining the elegant glamour of the emerald shape with the fire and brilliance of the round. This chic, angular shape with gently trimmed corners offers a unique and modern allure.

Engagement ring set with a radiant shaped diamond.

Heart-Shaped Diamonds

Heart-shaped diamonds shimmer with two symmetrical halves, creating a bold and romantic look. A meaningful shape, these diamonds are cut with precise symmetry to showcase the diamond's sparkle.

Engagement ring set with a heart shaped diamond and diamond heart eternity wedding ring.

Are Diamond Cut and Diamond Shape the Same Thing?

Though there's a difference between shape and cut, many jewelers use the terms interchangeably. The shape is the silhouette of the stone, while the cut refers to the balance of proportion, symmetry, and polish achieved by the diamond cutter. 

Precise cuts ensure diamonds reflect light and sparkle. Professional gemologists grade a diamond's cut by analyzing seven components: brightness, dispersion, scintillation, weight ratio, durability, polish, and symmetry. Learn more about these seven components in our Diamond Cuts Guide.  

The shape of a diamond describes the outline of the diamond itself. When you look at the diamond, you can discern its shape quickly. It takes a more experienced eye to notice the cut because you have to take in the facets, reflective qualities, and overall proportions of the diamond. 

You can choose any shape for a diamond and then get a specific cut, like Super Ideal, Very Good, or Good, depending on how much light reflection and sparkle you want.

Oval and round diamond engagement rings.

Ideal Length-To-Width (L:W) Ratio for Each Diamond Shape

A factor that is often overlooked is the length-to-width ratio of a diamond. It’s different for each diamond shape, but in general, the length-to-width ratio gives diamonds a look of symmetry.

  • Round: Since round diamonds are close to a perfect circle, the ideal ratio is 1 because the length and width should be the same. Most brilliant cut round diamonds have a ratio of 1 or 1.03.

  • Oval: Oval diamonds are slightly elongated because, otherwise, they’d look round. The typical oval length-to-width ratio ranges between 1.3 to 1.5. Diamonds closer to the 1.3 ratios are rounder and get longer as they edge closer to 1.5.

  • Pear: Like oval diamonds, pear diamonds have a higher ratio because they’re longer. The ratio for pear diamonds can range from 1.4 up to 1.7 since they have a thicker bottom.

  • Princess: The ideal ratio for princess diamonds ranges from 1 to 1.04. This ratio gives them a sturdy square appearance while letting the sharp corners capture shine.

  • Emerald: An emerald-shaped diamond is unique because of how the facets look. The diamond itself has a rectangular shape, but the facets catch the light and make the diamond look like a never-ending hall of mirrors. The ideal ratio for emerald cut diamonds ranges from 1.3 to 1.45.

  • Marquise: Marquise diamonds have a breathtaking look, with the long elliptical diamond giving your engagement ring a timeless look. The ideal ratio for marquise diamonds is the highest on the list due to the stone’s length. You’ll find most marquise shapes with ratios starting at 1.85 to 2.1.

  • Asscher: Asscher diamonds have a ratio close to that of a princess. A 1 ratio is ideal, but you might find variations up to 1.05. This allows the square shape to provide a sturdy base, so the unique octagonal look will catch everyone’s attention.

  • Cushion: A cushion diamond can be square, but it often has a slightly higher ratio, giving it a rectangular shape. Even a ratio of 1.14 is more rectangular than square.

  • Radiant: A radiant diamond is a popular choice for an engagement ring because you can customize the look depending on the ratio. A longer, narrower rectangle will have a ratio of 1.35 or higher.

  • Heart: The ratio for a heart shaped diamond is close to 1 because symmetry is crucial.

Why Length-to-Width Ratio Matters

Length-to-width ratio matters because it impacts how your diamond looks and can change the overall aesthetic of your ring. 


A length-to-width ratio of 1 tells you that the diamond is perfectly symmetrical, as in the case of square-cut, round-cut, and heart-shaped diamonds. Anything higher than one is an elongated diamond that covers more of your finger.  


An ideal length-to-width ratio is optional, but understanding the basics helps you picture what your engagement ring will look like. There's no set length-to-width ratio you need to shop for; the right ratio for your diamond jewelry depends entirely on personal preference and how you want your diamond to look. 

Having an ideal length-to-width ratio isn’t a necessity, but understanding the basics helps you picture what your engagement ring will look like.Anything outside of the ideal length-to-width ranges might change the brilliance and cut of the diamond. So, if the proportions of a diamond are too far off, you could potentially lose some sparkle if the diamond facets can’t catch the light in the right way.

But there’s no set length-to-width ratio you need to shop for; the right ratio for your diamond jewelry depends entirely on personal preference and how you want your diamonds to look.

How Diamond Shape Affects Price

Diamond shape affects price just as the 4C's do. Anything impacting the diamond's appearance can potentially change the price. 

Round diamonds are so popular that the market price is higher than fancy shapes. But there's more to the cost that happens behind the scenes. The manufacturing process requires more of the rough diamond to make the perfect round shape, so you're paying for that precision. Cutting a rough diamond into a rounded shape discards more diamond chips, so you're paying for what isn't usable in other jewelry. 

Princess-cut diamonds are more affordable than round-cut diamonds. In addition to being less popular, the manufacturing process uses more of the rough diamond to cut into a princess shape than a round shape. 

Radiant, emerald, cushion, and asscher-cut diamonds are more affordable than rounds because they use most of the rough diamonds. Choosing a fancy-shaped diamond not only means you'll enjoy a unique ring but also that you're discarding fewer diamond chips and saving money, all at the same time.

Loose diamonds in a variety of shapes.