Oval Engagement Rings

An oval is a brilliant cut stretched along one axis, and that single change does two things at once: it covers more of the finger than a round diamond of the same weight, and it lengthens the hand. It is the shape we are asked for most, and the one with the most to get right.

Build a oval ring See stones in person

The oval in brief

Cut style: Brilliant cut. Faceted like a round brilliant — GIA describes ovals as typically carrying 57 or 58 facets, most commonly eight bezels on the crown against eight mains on the pavilion. The busy facet pattern is forgiving: it breaks light up finely enough to disguise small inclusions and a little warmth of colour.
Length to width: 1.30 to 1.50 for most people. GIA sets out the effect of each band: 1.20 to 1.29 reads shorter and rounder, close to a rounded cushion; 1.30 to 1.40 is a gentle elongation that suits most fingers; 1.41 to 1.50 is chosen for a slimming effect or a more dramatic stone. Beyond 1.50 is rare, because it is impractical to cut from the rough. In the lab GIA sees ovals cut anywhere from about 1.2 to 1.7 — so treat 1.30 to 1.50 as the range to ask for rather than a rule.
One carat measures: About 7.7 × 5.7 mm. A useful sanity check — carat is weight, not size, and two stones of the same weight in different shapes cover quite different amounts of finger.

Choosing a oval diamond

General four Cs advice is written for round brilliants. Where it differs for this shape, it differs like this.

Colour matters more here

An elongated stone concentrates colour at the tips. GIA recommends staying within G to H so the diamond still reads as white to the eye.

Clarity is forgiving

The brilliant faceting hides a good deal, particularly near the edges and under facets. GIA points at VS2 or SI1 as the best balance of value and appearance.

No official cut grade

Round brilliants are the only shape GIA awards a cut grade. An oval's report carries polish and symmetry, and everything else is the cutter's judgement — which is why the stone in front of you matters more than the paper.

The bow tie

A dark band across the middle of an elongated brilliant. GIA's explanation is unusually satisfying: the light it is blocking is you — your own head and shoulders, reflected back — so the closer your face gets, the more pronounced it looks. Some degree of it is always present, and a subtle one adds depth. Worth knowing that the trade has quietly designed it out: GIA's lab saw more than half of ovals cut with pavilion mains across the belly before 2014, and by 2023 nearly ninety per cent had none. Never accept a promise of a bow-tie-free oval; ask to see the stone tilted instead.

Setting a oval

Rounded edges rather than points make an oval one of the harder shapes to chip — GIA rates it less prone than a princess or a marquise. The caveat is a very thin girdle, which is worth checking. Four claws show the outline; six hold a longer stone flatter.

The wedding ring beside it

Straightforward, with one design decision. A straight band meets the setting cleanly on most ovals, but a low-profile setting can leave a hairline gap where the curve of the stone passes over it. We make a shaped band where that happens, cut to the ring rather than ordered from a drawer.

All ten shapes compared, with profile, width and whether to solder the pair.

Where the shape comes from

The modern oval brilliant was developed in 1957 by the diamond cutter Lazare Kaplan, with 58 facets.

Oval diamonds, answered

Do oval diamonds sparkle as much as round diamonds?

Close, but not identically. An oval is faceted in the brilliant style like a round, so it sparkles in the same way — what differs is that the elongation spreads the pattern out and introduces the bow tie. A well-cut oval is a very bright stone. A poorly cut one is dark through the middle, which is why this is a shape to see in person.

Do oval diamonds look bigger than round diamonds?

Yes. GIA states that an oval's elongated shape gives it a larger surface area than a round diamond of the same carat weight, so it reads as a bigger stone face-up. Anyone quoting you a precise percentage is estimating — GIA does not publish one, and the real figure varies with how the individual stone is cut.

What is the best ratio for an oval diamond?

Between 1.30 and 1.50 for most people. Below 1.30 the stone starts to read as round; above 1.50 is rare because it is hard to cut from the rough. Within that band it is genuinely preference: 1.30 to 1.40 is the classic gentle oval, 1.41 to 1.50 is longer and more dramatic on the finger.

Do all oval diamonds have a bow tie?

Some degree of one, yes — GIA is explicit that it is always present to an extent, and that a subtle bow tie adds character rather than detracting. What you are avoiding is a heavy one. Modern cutting has reduced it substantially: nearly ninety per cent of ovals GIA saw in 2023 were cut without pavilion mains across the belly, the arrangement that causes the worst of it.

Why are oval diamonds cheaper than round diamonds?

Because cutting an oval wastes less of the rough crystal. A round brilliant discards a great deal of the original stone to reach its shape; an elongated brilliant keeps more of it. You are paying for less wasted carat weight, not for a lesser diamond.

How much does an oval engagement ring cost in the UK?

It depends almost entirely on the stone — carat weight first, then colour, clarity and how well it is cut, and whether it is natural or laboratory-grown. The setting is a much smaller part of the total than most people expect. Tell us a budget and we will show you what it buys in an oval rather than starting from a ring and working back.

Other shapes

Undecided is a perfectly good place to start — come and see several side by side, which is the only way to settle it. Before that, the natural and laboratory-grown comparison and the ring size guide are the two things worth reading.

Sources

Gemmological claims on this page are from the Gemological Institute of America. Where GIA gives no figure — facet counts for most fancy shapes, several length-to-width ratios — we say so rather than repeat a trade convention as fact.