150 Ashley Road, Hale,

Cheshire, WA15 9SA

0161 233 9977


Third Floor, St Johns Court, 19B Quay Street,

Manchester, M3 3HN

0800 080 3535


5 St Christopher’s Pl, Marylebone,

London, W1U 1NA

020 33 271 271

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Oval Cut Diamond Guide

Discover more about oval diamonds - the most brilliant stone for your diamond engagement ring.

Oval Cut Diamond Shape

The oval cut diamond is a modified version of the round brilliant cut diamond but with a longer rounded shape. It was invented by Russian diamond cutter Lazare Kaplan in 1957.

The diamond is comprised of 56 facets. To achieve the perfect oval shape we recommend a length to width ratio between 1.35 to 1.50.

The diamond can be prone to the bow-tie effect, where a dark area shaped like a bow-tie may appear at the centre of the stone. This is usually the result of poorly cut angles, so we always recommend selecting an excellent cut diamond.

The long shape of the stone is popular for engagement rings as it can elongate short fingers. The oval cut optimises carat weight, so lower carat grades will appear slightly larger.

Diamond Ratio

These are the recommended ratios, table% and depth% for round brilliant cut diamonds.

Shape Length To Width Ratio Table% Depth%
Oval 1.35 To 1.45 54% – 65% 58% – 68%