Diamond Shapes: How Each Cut Looks, Wears and Costs
Published . Updated . 2 minute read.
Editorial review: Shape characteristics checked against GIA educational material. Ratio ranges reflect common buyer preferences, not grading standards. Last reviewed .
The shape of a stone decides the ring’s outline more than any other choice. It also affects price, how large the stone looks and how carefully it must be set.
Shape by shape
Round
The benchmark for sparkle and the most popular shape. Round brilliants lose the most rough material in cutting, which is part of why they cost more per carat. They suit every setting style.
Oval
An elongated brilliant with much of the round’s liveliness. Watch for the bow-tie, a dark band across the center. More on oval engagement rings.
Emerald
A rectangular step cut with cropped corners that produces long, mirror-like flashes. Clarity matters more than usual. More on emerald cut engagement rings.
Cushion
A square or rectangle with rounded corners and pillowy sides. Soft and romantic, and very popular in halo and vintage-inspired settings. Appearance varies a lot between cutters, so compare photos carefully.
Pear
A teardrop combining a rounded end and a point. Looks large for its weight. Protect the tip with a V-prong. More on pear shaped engagement rings.
Princess
A square brilliant with sharp corners. Good value per carat because cutting wastes less rough. The four corners need prongs.
Marquise
A long boat shape with two points. The largest-looking shape per carat, with strong vintage and botanical associations.
Radiant
A rectangle or square with trimmed corners and brilliant faceting. It combines the outline of an emerald cut with sparkle closer to a round’s.
Heart
A symbolic shape that needs to be at least moderately large for the outline to read clearly. Symmetry is critical.
Asscher
A square step cut with deeply cropped corners, closely associated with Art Deco jewelry.
Comparison table
| Shape | Sparkle style | Looks large for weight? | Points to protect | Typical ratio preference |
|---|---|---|---|---|
| Round | Brilliant | Average | None | 1.00 |
| Oval | Brilliant | Yes | None | 1.30 to 1.50 |
| Emerald | Step flashes | Somewhat | Corners are cropped | 1.30 to 1.50 |
| Cushion | Brilliant or crushed-ice | Less than oval | None | 1.00 to 1.20 |
| Pear | Brilliant | Yes | One point | 1.45 to 1.75 |
| Princess | Brilliant | Average | Four corners | 1.00 to 1.05 |
| Marquise | Brilliant | Most | Two points | 1.75 to 2.25 |
| Radiant | Brilliant | Average | Corners are trimmed | 1.00 to 1.35 |
| Heart | Brilliant | Average | One point | 0.90 to 1.10 |
| Asscher | Step flashes | Less | Corners are cropped | 1.00 to 1.05 |
The ratio column describes what many buyers prefer; it is not a grading standard. Your own eye is the best judge.
Frequently asked questions
Which diamond shape looks biggest for its carat weight?
Elongated shapes such as marquise, oval and pear usually have the largest face-up area per carat, because more of their weight is spread across the top rather than held in depth.
Which diamond shape sparkles the most?
The round brilliant is designed for maximum brilliance and fire. Radiant, cushion and oval brilliant-cut shapes are also very lively. Step cuts such as emerald and Asscher sparkle less and show broader flashes instead.
What is the most durable diamond shape?
Shapes without sharp points, such as round, oval and cushion, are the least prone to chipping. Emerald and Asscher have cut corners, which helps. Pear, marquise, princess and heart shapes have points that benefit from protective prongs.
Sources and further reading
- The 4Cs of diamond quality (Gemological Institute of America)