Round and oval are the two most popular diamond shapes for engagement rings. Both are brilliant cuts, so both sparkle. The difference is in the outline, how big the stone looks, and the feel of the ring. This guide walks you through each point.
The quick answer
| Round | Oval | |
|---|---|---|
| Sparkle | The most of any shape | Very high, close to round |
| Looks on the hand | Classic, balanced | Larger for the same carat, makes fingers look longer |
| Style | Timeless | Modern and elegant |
| Price per carat | Usually higher | Usually a little lower |
| Things to check | Cut grade | Shape ratio and "bow-tie" |
Sparkle
The round brilliant cut was designed to return as much light as possible, which is why it is the benchmark for sparkle. An oval uses a similar facet pattern stretched into a longer shape. A well-cut oval is very bright too, just slightly less even across the stone.
Some ovals show a darker band across the middle called a bow-tie. A light bow-tie is normal. A strong one makes the stone look dull, so it is worth looking at photos and videos before you buy.
How big it looks
Because an oval is longer, it shows more surface from the top than a round diamond of the same carat weight. Many people choose an oval for exactly this reason: it looks bigger on the hand. The long shape also makes fingers look slimmer.
For an oval, the length-to-width ratio controls the look. Around 1.30 to 1.50 is the most popular range. Lower numbers look fuller; higher numbers look slimmer and more dramatic.
Price
Round diamonds are in the highest demand and lose the most rough material when they are cut, so they usually cost more per carat. An oval of the same carat weight and quality often costs a little less and still looks larger. Lab-grown diamonds lower the price of both shapes a lot. Read our lab-grown vs. natural diamond guide to compare.
Style and settings
Both shapes work with almost every setting:
- Solitaire: one stone on a simple band, the cleanest look. See solitaire engagement rings.
- Halo: a frame of small diamonds that adds sparkle and size. See halo engagement rings.
- Hidden halo: small diamonds under the center stone that only show from the side.
- Three-stone: a center diamond with a stone on each side. See three-stone engagement rings.
Learn more about each option in our engagement ring settings guide.
Which one should you choose?
- Choose round if you want the most sparkle and a classic ring that will never look dated.
- Choose oval if you want the stone to look bigger, like a longer and more modern shape, or want more size for your budget.
Still deciding? Our diamond shapes guide covers all ten popular cuts.
Shop both shapes
Browse our round engagement rings and oval engagement rings, all in solid 14k yellow, white or rose gold with lab-grown or natural diamonds. Want to see them in person? Book a consultation with our NYC studio.