Oval Cut Diamonds

The oval has quietly become the shape people ask for by name. It offers a way to get visible size without moving up in carat weight, and it does it while keeping the brilliance that makes a round so hard to beat. For anyone who wants their ring noticed from across a room, this is usually the answer.

It sits in the brilliant family of faceting styles, the same group the International Gem Society distinguishes from step cuts like the emerald. That matters in practice: brilliant faceting scatters light rapidly, which hides small inclusions and slight warmth far better than an open step cut ever could.

An oval cut is an elongated brilliant, normally carrying 56 to 58 facets arranged in the same pattern as a round brilliant but pulled into an ellipse. There are no corners and no points, which makes it one of the most durable shapes you can choose. Nothing sits proud where it can catch.

The elongation is the whole point. Because the stone is stretched, more of its weight sits at the surface where you see it rather than buried in the pavilion. The result is roughly ten per cent more face-up area than a round of the same carat weight, and a silhouette that visually lengthens the finger.

Length-to-width ratio is the number that defines an oval's character. Around 1.30 gives a fuller, rounder outline. Around 1.50 is distinctly long and dramatic. Most people settle between 1.35 and 1.45, which reads as clearly oval without looking stretched.

Oval stones have been cut for centuries, but the modern oval brilliant is a twentieth century invention. It was developed in the late 1950s by Lazare Kaplan, a cutter already known for working out how to rescue value from flawed rough. His oval applied round brilliant facet logic to an elongated outline, and it solved a real problem: rough crystals that could not yield a good round could still yield a beautiful oval.

For decades it stayed a specialist choice. Its recent rise has been driven by exactly the qualities it was designed around, size for weight and a flattering line on the hand.

Every elongated brilliant has a bow-tie: a dark shape across the middle of the stone where the facets shadow your own reflection back at you. In a well cut oval it is faint and you have to look for it. In a badly cut one it is a black band that swallows the centre of the diamond, and no setting will hide it.

This is not something a certificate will tell you, because fancy shapes are not given an overall cut grade. It has to be seen. Ask us and we will describe the bow-tie on the exact stone before you commit.

Because there is no standard cut grade for ovals, read the proportions instead. Depth between roughly 58% and 65% with a table around 53% to 63% produces the liveliest stone. Symmetry matters more than most people expect: the two ends should mirror each other exactly, and any lopsidedness shows immediately in such a simple outline.

Every Ronora oval is Excellent cut. We do not stock anything below it in any shape.

Elongated shapes concentrate any warmth at their tips, so a tinted oval gives itself away at the two ends even when the centre still looks bright. It is the same effect that shows in the corners of a princess, just in a different place.

Ronora ovals sit in the D-E-F colourless range only, so the ends stay as clean as the table.

A one carat oval measures roughly 7.7mm by 5.7mm, against about 6.5mm across for a one carat round. That extra length is why it reads bigger on the hand despite weighing exactly the same. The full diamond measurements guide gives the millimetre size at every carat weight, drawn at true scale. If looking larger for your budget is the goal, the oval is the most reliable way to get there without changing carat weight at all.

Clarity is also more forgiving here than on a step cut. All that brilliant faceting breaks light up fast enough to hide small inclusions, which is why an oval rarely needs the very top of the clarity scale to look flawless to the eye.

See an oval at actual size on your own ring size, or as a stud or pendant, with Find Me Diamond, our free diamond size visualizer.

An oval has no vulnerable points, so almost every setting works. The choice is about proportion rather than protection.

• Solitaire. Four or six prongs and nothing else. The cleanest way to show the outline, and the setting that makes the elongation obvious.
• Halo. A ring of small rounds makes an oval read substantially larger and softens the ends. Popular for exactly that reason.
• Three stone. Tapered sides, often pear or marquise, extend the line of the centre stone even further along the finger.
• East-west. Turning the oval sideways is a genuinely modern look. It shortens the visual line and suits people who find a long stone too showy.
• Bezel. A full metal rim traces the curve and gives the most secure, most minimal result.

What it does well

• Looks around ten per cent larger than a round of the same carat weight.
• Lengthens and flatters the finger.
• No points or corners, so it is one of the most durable shapes available.
• Brilliant faceting hides small inclusions and slight warmth.
• Lower price per carat than a round.

What to watch

• Every oval has a bow-tie. A bad one ruins the stone and no certificate warns you.
• Colour shows at the two ends before it shows anywhere else.
• No official cut grade exists, so proportions must be read individually.
• Poor symmetry is immediately obvious in such a simple outline. See symmetry.