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Oval pendants · Emerald-cut rings · Pear earrings
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Shape is the first thing anyone notices about a diamond, long before its grades. It sets the mood of the whole ring, from classic to romantic to severe and modern, and it quietly changes the price too.
At a glance
- Most brilliant: round, the benchmark for sparkle.
- Best value: fancy shapes such as oval, cushion and pear often cost 15-30% less than a round.
- Why rounds cost more: cutting one can waste 50-60% of the rough crystal.
- Looks largest: elongated shapes such as oval, pear and marquise.
- Most vintage: emerald, Asscher and cushion.
What is the most popular diamond shape?
The round brilliant remains the classic choice and the most brilliant of all shapes, with 57 or 58 facets arranged to return as much light as possible. Its modern proportions trace back to Marcel Tolkowsky, whose 1919 study set out the angles that still guide cutters today. The oval has become the leading alternative, prized for looking larger than a round of the same weight.
The brilliant shapes: round, oval, pear, marquise and princess
Brilliant cuts use many triangular and kite-shaped facets to create maximum sparkle. The oval elongates the finger and hides color well. The pear, half round and half marquise, is romantic and a little unexpected. The marquise, long and pointed at both ends, is said to take its name from the court of Louis XV. The princess, a square brilliant introduced around 1980, is the modern square choice and costs less than a round.
The step cuts: emerald and Asscher
Step cuts use long, parallel facets like a staircase, trading sparkle for flashes of light and a clear, glassy depth often described as a hall of mirrors. The emerald cut was first developed for emeralds, to protect a brittle stone during cutting. The Asscher, its square cousin with cropped corners, was created by Joseph Asscher in Amsterdam in 1902 and became an Art Deco icon. Because step cuts show everything inside the stone, choose a higher clarity grade.
The soft shapes: cushion, radiant and heart
The cushion descends from the old mine cut of the eighteenth and nineteenth centuries, a square with rounded corners cut for candlelight. The radiant blends the outline of an emerald cut with the sparkle of a brilliant. The heart is the most sentimental of all and needs a stone of at least half a carat for its shape to read clearly.
Grades tell you the quality. Shape tells you the personality.
How does diamond shape affect price?
Rounds are the most expensive because cutting one can waste half or more of the rough crystal. Fancy shapes keep more of the original stone, which is why they often cost 15 to 30 percent less at the same weight and grades. If you love a round but your budget does not, an oval gives similar brilliance and more visible size. You can compare every shape side by side in Blue Nile’s diamond search.
Frequently asked questions
Which diamond shape sparkles the most?
The round brilliant, followed closely by the oval, cushion and radiant.
Which diamond shape looks biggest?
Elongated shapes such as oval, pear and marquise, which spread their weight across a larger surface.
Why are round diamonds more expensive?
Cutting a round wastes more of the rough diamond, and demand for rounds is highest.
Sources: Beyond Carat (StoneAlgo data) · GIA · Blue Nile
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- Oval diamond pendants in 14k gold: the modern favourite.
- Emerald-cut diamond rings for Art Deco polish.
- Pear-shaped diamond earrings, romantic and unexpected.
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