Diamond Shapes
From the timeless round brilliant to the elegant emerald, each diamond shape has its own personality and brilliance pattern. Discover which shape speaks to you.
Understanding Diamond Shapes
Diamond shape refers to the outline and overall appearance of a diamond when viewed from above. While "cut" describes how well a diamond's facets interact with light, "shape" refers to its geometric form. Each shape creates a different look on the finger and reflects light in its own unique way.
Round Brilliant
The most popular diamond shape, engineered for maximum brilliance. Its 57-58 facets are designed to reflect the most light possible. The most popular choice, representing over 60% of all diamond sales. Offers the most sparkle of any shape with 57-58 facets optimized for light return. Ideal length-to-width ratio: 1.00. Best for classic, timeless engagement rings.
Princess
A square or rectangular shape with pointed corners. The princess cut offers brilliant sparkle with a modern, geometric appeal. The second most popular fancy shape. Its sharp corners make it appear larger than a round diamond of equal carat weight. Ideal L/W ratio: 1.00-1.05. Ensure a protective prong setting for the pointed corners.
Oval
An elongated shape that creates the illusion of a larger stone. Oval diamonds have a similar brilliance to rounds with a unique silhouette. One of the fastest-growing choices for engagement rings. The elongated shape creates the illusion of a larger diamond and makes fingers appear longer and more slender. Ideal L/W ratio: 1.30-1.50. Watch for the "bow-tie effect" — a dark area across the center.
Heart
The ultimate symbol of love and romance. A modified brilliant-cut with a distinctive cleft at the top, requiring skilled craftsmanship to achieve symmetry. A romantic symbol that works best in larger sizes (over 0.50ct) where the shape is clearly visible. Ideal L/W ratio: 0.90-1.10. Requires a skilled cutter to achieve symmetry. Best set in a prong setting that protects the point.
Cushion
A square or rectangular shape with rounded corners, resembling a pillow. Known for its romantic, vintage appeal and soft sparkle. Combines a square shape with rounded corners, resembling a pillow. Available in square and elongated rectangular proportions. Ideal L/W ratio: 1.00-1.05 (square) or 1.15-1.30 (elongated). Known for exceptional fire and large facets.
Emerald
A rectangular shape with step-cut facets that create a hall-of-mirrors effect. Emphasizes clarity with dramatic flashes of light. A step-cut diamond with rectangular facets that create a "hall of mirrors" effect. Emphasizes clarity over sparkle — choose VS1 or better. Ideal L/W ratio: 1.30-1.50. Popular for Art Deco-inspired and vintage designs.
Asscher
A square step-cut with a distinctive "X" pattern when viewed from above. Art Deco style with a mesmerizing depth. Similar to emerald cut but square with deeper facets, creating more brilliance. Ideal L/W ratio: 1.00-1.05. The deep pavilion creates exceptional depth and light play. Choose clarity VS1 or better for best appearance.
Pear
A teardrop shape combining the brilliance of a round with a unique pointed end. Creates a slimming effect on the finger. Also called "teardrop," this versatile shape elongates the finger and offers excellent brilliance. Ideal L/W ratio: 1.50-1.75. Can be worn with the point facing up or down. Ensure the point is protected by a V-prong setting.
Marquise
An elongated shape with pointed ends on both sides. Maximizes carat weight with an elegant, boat-like silhouette. Has the largest face-up area of any diamond shape per carat weight — making it appear the largest. Ideal L/W ratio: 1.75-2.25. The elongated shape is flattering on the finger. Watch for the bow-tie effect and ensure symmetrical points.
Radiant
Combines the elegant outline of an emerald cut with the brilliance of a round. Square or rectangular with trimmed corners. Combines the elegant shape of an emerald cut with the brilliance of a round. The trimmed corners make it versatile for pairing with other stones. Ideal L/W ratio: 1.00-1.05 (square) or 1.15-1.35 (rectangular). Excellent at hiding inclusions.
Most Popular Diamond Shapes
While personal preference should always guide your choice, here's how diamond shapes rank in popularity today.
- Round Brilliant ~60% of all diamond purchases — the timeless, universally flattering choice
- Oval Fastest growing, now ~15% of engagement rings — modern and elongating
- Cushion ~8% market share — vintage charm with exceptional fire
- Princess ~7% of purchases — contemporary geometric appeal
- Emerald Growing in popularity, especially for modern minimalist designs
- Pear Popular for pendants and unique engagement rings
Shape popularity evolves with trends. Choose the shape that speaks to your personal style.
Price by Diamond Shape
Diamond shape significantly affects pricing. Here's what to know when budgeting for your perfect stone.
- Round diamonds carry a premium — highest demand and most material waste during cutting make rounds the most expensive shape per carat.
- Fancy shapes offer 20-40% savings — oval, cushion, and pear diamonds cost significantly less than round diamonds of the same carat weight and quality.
- Elongated shapes appear larger — oval, marquise, and pear diamonds look bigger than their carat weight suggests due to their spread across the finger.
- Best value shapes: marquise (largest face-up area per carat), oval (elongating effect + good value), and cushion (exceptional fire at lower cost).
- Lab-grown diamonds offer additional 40-60% savings across all shapes compared to equivalent mined diamonds.
Frequently Asked Questions
Marquise has the largest face-up area per carat weight, followed by pear and oval. Elongated shapes generally appear larger than round or square shapes of equal carat weight.
Round brilliant remains the most popular at approximately 60% of all engagement ring diamonds. Oval has seen the fastest growth in recent years, now representing about 15% of engagement ring purchases.
Fancy shapes like cushion, pear, and emerald cut are typically 20-40% less expensive than round diamonds of the same carat weight and quality. Round diamonds command a premium due to high demand and greater rough diamond waste during cutting.
Shape refers to the outline of the diamond (round, oval, princess, etc.). Cut refers to how well the diamond's facets interact with light — measured as Excellent, Very Good, Good, Fair, or Poor. A round diamond can have a poor cut, and an oval diamond can have an excellent cut.
Round brilliant and radiant cuts hide inclusions best due to their many facets and brilliant-cut pattern. Step-cut shapes like emerald and asscher show inclusions more readily, so higher clarity grades (VS1+) are recommended for these shapes.
Yes. Round brilliant diamonds have the most sparkle (light return) due to their mathematically optimized 57-58 facet pattern. Brilliant-cut fancy shapes (oval, cushion, radiant) also sparkle well. Step-cut shapes (emerald, asscher) have a different, more subdued "hall of mirrors" light pattern rather than intense sparkle.
Find Your Perfect Shape
Explore our collection of lab-grown diamonds in all popular shapes.
Continue Learning: The 4Cs · Lab Grown Diamonds · Lab vs Mined · How They're Made