Round brilliant is the most popular and most sparkly diamond shape, and the most expensive per carat. Oval, pear and marquise look larger for their weight and lengthen the finger. Princess and radiant give a modern square or rectangular look with lots of sparkle. Emerald and Asscher step cuts show clarity rather than sparkle, so choose higher clarity grades for them.
Shape is the first choice most people make when buying a diamond, and it affects sparkle, apparent size and price. Here is how the popular shapes compare.
Shapes at a glance
| Shape | Look | Sparkle | Looks larger? | Notes |
|---|---|---|---|---|
| Round brilliant | Classic, timeless | Highest | No | Most expensive per carat |
| Oval | Elegant, elongated | High | Yes | Watch for a “bow tie” shadow |
| Princess | Modern square | High | Slightly | Protect the pointed corners |
| Cushion | Soft square, vintage | High | No | Many variations in shape |
| Emerald | Rectangular step cut | Flashes, not sparkle | Yes | Shows inclusions; choose higher clarity |
| Asscher | Square step cut | Flashes | No | Art deco look |
| Radiant | Rectangle or square with brilliant facets | High | Slightly | Combines emerald outline with sparkle |
| Pear | Teardrop | High | Yes | Point should be protected |
| Marquise | Long, pointed oval | High | Yes, the most | Bold, vintage feel |
| Heart | Heart | Good | No | Best above about 1 carat for a clear shape |
Brilliant cuts vs step cuts
- Brilliant cuts (round, oval, princess, cushion, radiant, pear, marquise) have many triangular and kite-shaped facets that maximize sparkle and hide small inclusions.
- Step cuts (emerald, Asscher) have long, parallel facets that create a “hall of mirrors” effect. They show clarity and color more, so choose higher grades.
Shape and finger flattery
- Elongated shapes (oval, pear, marquise, emerald) make fingers look longer and slimmer.
- Round and cushion suit almost every hand.
- Wide fingers look balanced with larger or elongated stones.
Things to check per shape
- Oval, pear and marquise: look for a minimal bow tie (a dark band across the middle) and a pleasing length-to-width ratio, often around 1.3 to 1.5 for ovals.
- Princess, pear and marquise: choose a setting that protects the points from chipping.
- Emerald and Asscher: choose higher clarity, since inclusions are easier to see.
- Cushion: compare photos, because cushion shapes vary widely between cutters.
Price
Round brilliants cost the most per carat because cutting them wastes the most rough diamond. Fancy shapes usually cost less for the same carat weight, and elongated shapes also look larger, so they can stretch a budget further.
Common questions
What diamond shape looks the biggest?
Elongated shapes such as oval, marquise and pear have a larger surface area for their carat weight, so they tend to look bigger than a round diamond of the same weight.
What is the most popular engagement ring shape?
Round brilliant remains the most popular, with oval close behind and growing in popularity.
Which diamond shape is the cheapest?
Fancy shapes such as oval, cushion and princess usually cost less per carat than round brilliants, because cutting them wastes less of the rough diamond.