---
title: "Oval or round diamond: which is better? Measured"
description: "In our models, a round brilliant returns far more light; an oval looks larger and scores higher for fire."
url: https://digitalgemology.com/learn/answers/oval-vs-round-diamond
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Learn](https://digitalgemology.com/learn) · [Answers](https://digitalgemology.com/learn/answers)

# Oval or round diamond: which is better?

From our own measurements · updated 2026-11-09

**In our models, a round brilliant returns far more light; an oval looks larger and scores higher for fire.** In our ray traces of diamond, the round brilliant scores 93 for brilliance, the oval 47. The oval scores 92 for fire against 78, and 87 for scintillation against 80. Its face-up area is 8% larger for the same weight. But it leaks 27% of the light, the round brilliant 2%.

**Brilliance, fire and scintillation of the round brilliant and the oval in diamond, out of 100, ranked by brilliance**

| Shape | Brilliance | Fire | Scintillation |
| --- | --- | --- | --- |
| [Round brilliant](https://digitalgemology.com/gemstones/diamond/t73-round-brilliant) | 93 | 78 | 80 |
| [Oval](https://digitalgemology.com/gemstones/diamond/oval) | 47 | 92 | 87 |

Score out of 100, ranked by brilliance Our model of each shape in diamond: brilliance and fire ray-traced face-up, scintillation from the facet count. Compare scores only within one gemstone; another cutter's proportions can score higher or lower. [How we measure](https://digitalgemology.com/learn/cut-performance-index)

## Why

The oval is a round brilliant stretched into an ellipse. Its pavilion facets slope at different angles along the length and across the width. Where the angles are wrong for the stone, light passes out of the back instead of returning. In an oval, this leakage can show as a dark [bow-tie](https://digitalgemology.com/learn/glossary/bow-tie) across the center. Your head, reflected in the stone, can make one too.

The longer outline spreads the same weight over a larger area, so the oval faces up larger.

Compare any two cuts in the [Cut Performance Wheel](https://digitalgemology.com/tools/cut-performance-wheel), or turn them in light in the [3D Gemstone Simulator](https://digitalgemology.com/tools/3d_gemstone_simulator).

## Read more

- [The bow-tie effect in diamonds: what it is](https://digitalgemology.com/learn/bow-tie/bow-tie-effect-in-diamonds)
- [What causes a bow-tie? Four explanations, tested](https://digitalgemology.com/learn/bow-tie/what-causes-a-bow-tie)
- [Oval Cut](https://digitalgemology.com/cuts/oval)

## More answers

- [What is the best cut for moissanite?](https://digitalgemology.com/learn/answers/best-cut-for-moissanite)
- [What is the best cut for a sapphire or a ruby?](https://digitalgemology.com/learn/answers/best-cut-for-sapphire-and-ruby)
- [What is the best cut for an emerald?](https://digitalgemology.com/learn/answers/best-cut-for-emerald)
- [What is the best cut for amethyst?](https://digitalgemology.com/learn/answers/best-cut-for-amethyst)
- [What is the best cut for cubic zirconia?](https://digitalgemology.com/learn/answers/best-cut-for-cubic-zirconia)
- [Which diamond shape sparkles the most?](https://digitalgemology.com/learn/answers/which-diamond-shape-sparkles-most)
- [Which diamond shape looks biggest for its carat weight?](https://digitalgemology.com/learn/answers/which-diamond-shape-looks-biggest)