Diamond Shape Guide
When it comes to diamonds, the shape of the stone is one of the most visible and defining features. While many people focus on the 4Cs—cut, color, clarity, and carat weight—diamond shape plays a huge role in the overall look and feel of a piece. Whether you’re drawn to classic elegance, modern geometry, or vintage charm, understanding the different diamond shapes can help you choose a stone that fits both your aesthetic and lifestyle.
In this guide, we’ll walk you through the most popular diamond shapes, from timeless round brilliants to the more unique hearts and pears, and explain what sets each one apart. We’ll also talk about what “fancy shapes” are and how they compare to the traditional round.
A Note on Terminology: Cuts and Shape
Many people use the word cut when referring to a diamond’s shape—for example, “princess cut” or “oval cut”—but strictly speaking, cut and shape are not the same thing. Shape describes the outline or form of the diamond (such as round, pear, or cushion), while cut refers to how well the diamond’s facets are proportioned, angled, and finished to reflect light. Cut quality affects a diamond’s brilliance and sparkle, whereas shape is a matter of geometry and style. Though the terms are often used interchangeably in casual conversation, it’s helpful to understand the difference when evaluating a diamond’s overall beauty and value.
Round Brilliant
The round brilliant is by far the most popular diamond shape—and for good reason. With 58 carefully proportioned facets, this shape was created for maximum brilliance and fire. The symmetry and light performance of a round brilliant shape make it the most reflective and sparkly of all shapes.
The timeless appeal, and versatility of it’s round shape allows it to suit pretty much any setting, from classic solitaires to ornate vintage styles. If you’re looking for a diamond that delivers optimal sparkle and pairs well with every kind of design, the round brilliant is hard to beat
Fancy Shaped Diamonds: What are they?
Any diamond that isn’t round is considered a “fancy shape.” This include princess, cushion, oval, pear, marquise, heart, emerald, Asscher, and radiant shapes.
While round brilliants are the traditional go-to—and still the most popular—fancy shapes offer unique visual appeal and often come with a lower price per carat. They also allow for more personal expression; each fancy shape conveys a slightly different mood, from romantic to modern to classic.
Choosing a fancy shape can also mean more flexibility with your design. Some designs lend themselves beautifully to vintage settings, while others shine in sleek, minimalist styles.
Princess
The princess shape is modern, angular, and full of sparkle.
The shape is square—or sometimes slightly rectangular—with sharp corners and a brilliant-style faceting that gives it lots of light return.
Introduced in the 1980s, the princess shape quickly gained popularity for its clean lines and contemporary look. It also offers excellent brilliance, second only to the round. Because of its shape, it’s often a more affordable option per carat compared to round diamonds, making it ideal for those who want impact without sacrificing quality.
Cushion
The cushion has a soft, pillow-like shape—hence the name. It combines a square or rectangular outline with rounded corners and a faceting style that can range from vintage to more modern brilliant shapes.
Cushion shaped diamonds are known for their romantic and antique feel. They may not sparkle quite as intensely as a round or princess diamond, but they have a distinctive glow and charm. If you’re drawn to designs with a bit of history and warmth, the cushion is a beautiful choice.
Oval
Oval diamonds offer the brilliance of a round diamond in a more elongated form. They’re elegant, flattering on the hand, and create the illusion of greater size due to their shape.
One of the key advantages of the oval shape is how well it maximizes carat weight. You often get a larger-looking stone for the same weight compared to other shapes. They also pair beautifully with a variety of settings—from simple solitaires to halos or side stones.
Marquise
Marquise diamonds are long and narrow with pointed ends. This form factor gives them a dramatic look. Legend has it that the shape was originally commissioned by King Louis XV of France, inspired by the smile of his mistress, the Marquise de Pompadour.
What makes the marquise unique is its ability to appear larger than it is. Its elongated shape makes fingers look longer and slimmer, and its spread across the finger often creates a bold but humble presence.
Pear
Also known as the teardrop shape, pear-shaped diamonds combine the best of both worlds: the round brilliant’s sparkle and the marquise’s elegant taper. One side is rounded, while the other comes to a gentle point.
This asymmetrical shape is eye-catching and full of character. Whether worn pointing up or down, a pear-shaped diamond is often chosen by those who want something just a little different while still keeping things refined and timeless.
Heart
The heart shape is the most symbolic of all diamond shapes. It’s a true statement of love and sentiment, shaped just like it sounds—with a cleft at the top and a rounded base.
Heart-shaped diamonds can be challenging to cut well, and their quality is often best appreciated in larger carat weights. When executed properly, though, the heart is undeniably romantic and bold, perfect for someone who wants a diamond with deep personal meaning.
Emerald
The emerald is known for its step-cut facets and open, mirror-like appearance. It has a rectangular shape with beveled corners and long, linear facets that create a sophisticated, almost architectural look.
Because of its wide, open table, clarity becomes especially important in emerald shaped stones —there’s less sparkle to hide imperfections, and any imperfections on the front facing facet can be made more prominent given the facet’s size. But the upside is a sleek, elegant diamond with clean lines and vintage appeal. It’s a favorite for those who lean toward understated beauty and timeless design.
Asscher
The Asscher is similar to the emerald but square in shape. This form factor gives it more pronounced corners and a distinctive “hall of mirrors” effect. Developed in the early 1900s and named after the Asscher Brothers of Amsterdam, it rose to fame during the Art Deco era.
Like the emerald, the Asscher has step-cut facets, but its symmetry and depth give it an almost hypnotic appearance. It’s a great choice for vintage-inspired settings or for those who appreciate old-world charm and precision.
Radiant
The radiant blends the best of both worlds: the outline of an emerald or cushion shape with the facet pattern of a brilliant stone. It’s rectangular or square with cropped corners, and it delivers plenty of sparkle thanks to its 70+ facets.
Radiant shapes are ideal for someone who wants a non-round diamond but still wants plenty of fire. They’re also forgiving when it comes to inclusions or color, which makes them a versatile and practical option for many settings.
Final Thoughts
Diamond shape is more than just a design choice—it’s a reflection of your style, your story, and how you want your jewelry to feel when you wear it. From the fire of the round brilliant shape to the vintage style of an emerald shape, there’s a design for every personality and occasion.
At TeLayne Designs, we specialize in creating one-of-a-kind, heirloom-grade diamond jewelry pieces that are made to be enjoyed for years to come. .
Whether you’re drawn to classic round brilliance or looking for a unique fancy shape to make your vision come to life, our team is here to guide you for whatever custom piece you have in mind.
Visit our studio in Dallas for a complimentary consultation and and discover the expert craftsmanship and world-class service that sets our work apart.