A diamond’s shape is the first thing anyone notices about an engagement ring — and it drives both the look and the price. This guide compares all ten popular diamond shapes so you can choose the one that suits your partner’s style and your budget. (Shape refers to the outline — round, oval, square. It’s different from cut quality, which is how well the diamond is faceted.)
The 10 diamond shapes at a glance
| Shape | Sparkle | Relative price* | Looks larger per carat? |
|---|---|---|---|
| Round brilliant | Highest | Most expensive | No (baseline) |
| Oval | High | Moderate | Yes |
| Pear | High | Lower | Yes |
| Marquise | High | Lower | Yes (largest) |
| Princess (square) | High | Lower | Slightly |
| Cushion | Medium-high | Lower | No |
| Radiant | High | Lower | Slightly |
| Emerald | Low (glassy flashes) | Lower | Yes |
| Asscher | Low (step facets) | Lower | No |
| Heart | High | Lower | No |
*Compared to a round diamond of the same carat and quality. Non-round shapes (“fancy shapes”) generally cost 15–40% less.
Round brilliant
The classic. Fifty-eight precisely angled facets make it the most brilliant, most sparkling shape, and it hides inclusions and color well. Because it’s in the highest demand and wastes the most rough diamond when cut, it’s also the priciest per carat.
Oval
Nearly as brilliant as a round but with an elongated outline that flatters the finger and looks larger per carat. One of the most popular choices today. Watch for the “bow-tie” — a dark area across the center — and choose a stone where it’s faint.
Princess
A square shape with sharp corners and strong sparkle — a modern, geometric look at a friendlier price than round. The pointed corners can chip, so protective prongs are recommended.
Cushion
A square or rectangular shape with rounded corners — soft, romantic, and slightly vintage. It shows fire (colored flashes) beautifully. Rounded corners are durable and prong-friendly.
Emerald
A rectangular shape with straight, stepped facets that create a “hall of mirrors” effect rather than crushed-ice sparkle. Elegant and understated — but because the open table shows everything, choose VS clarity or better and a higher color grade.
Pear
A teardrop — one rounded end, one point. It elongates the finger and looks large for its weight. Wear it with the point toward the fingernail, and protect the tip with a prong (a V-prong is ideal).
Marquise
A long, pointed oval. It has the largest surface area per carat of any shape, so it looks the biggest for the money. Both points need protective prongs.
Radiant
A rectangular or square shape with trimmed corners and brilliant faceting — the sparkle of a round with the silhouette of an emerald, and durable trimmed corners. A great hybrid choice.
Asscher
A square version of the emerald cut with cropped corners and concentric, geometric steps — distinctly Art Deco. Like the emerald, it needs higher clarity and color.
Heart
A romantic, unmistakable choice. It works best at 0.75 carat and above, where the shape reads clearly, and needs precise symmetry and a V-prong at the point.
Which diamond shape should you choose?
- Maximum sparkle: round, then oval or radiant.
- Largest look for your budget: marquise, pear or oval.
- Best value: any fancy shape — you get more carat for the same spend.
- Understated and elegant: emerald or Asscher (budget for higher clarity).
- Vintage feel: cushion or Asscher.
Frequently asked questions
What is the most popular diamond shape?
Round brilliant remains the most popular overall, followed closely by oval, which has surged in recent years.
Which diamond shape looks the biggest?
Elongated shapes — marquise, pear and oval — have more surface area facing up, so they look larger than a round of the same carat weight.
Which diamond shape is the cheapest?
Fancy (non-round) shapes cost less per carat than round. Emerald, Asscher and marquise are typically the best value because less rough diamond is lost when cutting them.
Do all shapes work in any setting?
Most do, but pointed shapes (pear, marquise, heart) need V-prongs to protect the tips, and emerald/Asscher stones look best in settings that frame their clean lines.
See the shapes in person
Our NYC studio carries every shape in a range of settings. Browse engagement rings, read our settings guide, or book a consultation to compare shapes side by side.