What Is Length-to-Width Ratio?

The ratio compares the measured length of a diamond with its width.

A ratio closer to 1.00 produces a squarer or rounder appearance. As the number increases, the diamond becomes progressively more elongated.

Oval Diamond Ratios

Lower-ratio ovals appear wider and softer. Higher-ratio ovals appear slimmer and more elongated.

The best choice depends on finger shape, setting style and personal preference.

Cushion Ratios

A ratio close to 1.00 creates the traditional square cushion appearance. Increasing the ratio creates an elongated cushion, which can provide greater visual length across the finger.

Pear Ratios

Pear shapes vary from wide teardrops to elegant elongated silhouettes. Ratio should be considered together with the curvature of the shoulders and the sharpness of the point.

Marquise Ratios

Marquise diamonds naturally favour higher ratios. A fuller marquise feels softer, while an extreme ratio creates a dramatic, slender appearance.

Moval Ratios

Movals are particularly sensitive to ratio because the silhouette sits between oval and marquise. Lower ratios tend to feel more oval-like, while longer stones move visually toward marquise territory.

Does Ratio Determine Cut Quality?

No. Ratio describes shape, not light performance.

Two diamonds with identical length-to-width ratios can differ dramatically in facet arrangement, bow tie, brightness, symmetry and overall beauty.

Does a Longer Ratio Look Larger?

Elongated diamonds can create strong finger coverage, which may make them appear visually substantial for their carat weight.

However, depth, width and actual millimetre measurements should always be considered alongside ratio.