Kove Jewelry

Marquise engagement rings: the complete guide

Updated 17 October 2026. By Alexey Kovernikov, owner of Kove Jewelry in Prague.

A marquise is the boldest of the classic diamond shapes: long, slim, with a point at each end. It looks larger than a round diamond of the same weight and makes the finger look longer — and it asks for a little more care when you choose the stone and the setting. This guide covers what to check, in the order a jeweller checks it.

What a marquise is

A marquise is an elongated outline with curved sides and two pointed ends. It is cut as a brilliant, so it sparkles like a round diamond, but its shape reads very differently on the hand: long, slim and directional. Source

The name comes with a story. According to legend, King Louis XV of France commissioned the cut and named it after his mistress, the Marquise de Pompadour — its outline was said to resemble her lips. It is a legend, not a documented fact, but it explains why the French name stuck. Source

Length-to-width ratio: how long is right

The ratio is the stone’s length divided by its width. It decides whether a marquise looks slender or short and full. There is no single “correct” number — GIA says the ideal comes down to personal preference — but these are the reference points:

About 2:1 — twice as long as it is wide — is the classic marquise proportion. Source
Most marquise diamonds submitted to the GIA laboratory fall between 1.6:1 and 2.2:1. Source
An earlier GIA buying guide suggests looking for 1.75:1 to 2.25:1. Source
Very long stones are harder to cut while keeping the face-up bright, and a marquise that is too long can be less durable; very short ones can look stubby. Source

What the market actually offers: in our sample of certified lab-grown marquise stones (table below), the median ratio sits at 1.96–1.98:1 at every size from 1 to 3 carats. In other words, a stone close to 2:1 is the easy one to find; much slimmer or much fuller stones exist, but you choose from fewer of them.

The bow-tie effect

Most marquise diamonds show a bow-tie: a darker, hourglass-shaped area across the middle of the stone, where the facets reflect less light back to your eye. A slight bow-tie is normal and can even add depth and contrast. A pronounced one dims the brilliance and becomes the first thing you notice. Source

You cannot judge it from the grading report alone. Proportions and faceting change how visible it is, so look at the stone in a video or in more than one kind of light before you decide. When you choose a stone with us, ask for the video of that exact stone. Source

Symmetry and the points

With a pointed shape, small differences show. GIA’s checklist for a marquise:

The left and right halves mirror each other and are equal in length; both curved sides have the same arc. Source
The two points line up on one axis. Source
The tips are crisp and well defined, not slightly rounded. Source
A girdle (the thin outer edge) that is slightly thicker at the points is acceptable — and often beneficial, because it protects them. Source
Check the points for inclusions. Source

Protecting the tips: settings that suit a marquise

The two pointed tips are the most vulnerable part of a marquise: a knock on the point is what chips it. The classic protection is a V-prong — a small V-shaped claw that wraps around each point and shields it from impact. It matters more the larger the stone. Source

GIA’s guide also discusses six-prong, bezel, halo and split-shank settings for the shape, and the marquise pairs well with other stones in multi-stone rings. Whichever design you like, ask us how the points are held on it: we confirm the full specification in writing before production starts. Source

The metal colour is a matter of taste rather than protection — yellow, white or rose gold compared.

How big a marquise looks: 1 to 3 carats in millimetres

An elongated outline spreads the same weight over a longer face, so a marquise can look larger face-up than a round diamond of the same carat weight, and its slim silhouette lengthens the finger. Here is what that means in millimetres — median sizes of certified lab-grown stones available through our partner supplier network (random sample, 17 October 2026): Source

Carat	Marquise, length × width	Ratio	Round, diameter	Marquise length vs round
1.0 ct	10.35 × 5.26 mm	1.97 : 1	6.48 mm	≈ 1.6×
1.5 ct	11.84 × 6.00 mm	1.97 : 1	7.41 mm	≈ 1.6×
2.0 ct	12.93 × 6.59 mm	1.96 : 1	8.15 mm	≈ 1.6×
2.5 ct	14.07 × 7.09 mm	1.98 : 1	8.79 mm	≈ 1.6×
3.0 ct	14.84 × 7.52 mm	1.97 : 1	9.33 mm	≈ 1.6×

Medians from a random 8 % sample of active certified white lab-grown stones (118–269 marquise stones per size). Bands: 1.0 ct = 0.98–1.04 ct, 1.5 = 1.48–1.55, 2.0 = 1.98–2.06, 2.5 = 2.48–2.56, 3.0 = 2.98–3.08. Each stone is cut individually, so the one you choose will differ a little.

Two things follow. A marquise is long but narrow: at 1 carat it is about 1.6 times the length of a round but a millimetre narrower. And doubling the weight does not double the look — from 1 to 2 carats the length grows by about a quarter (10.35 → 12.93 mm). For every shape side by side, see the diamond carat size chart in millimetres.

Numbers only go so far. The Solitaire Studio shows a 1 to 5 carat diamond on a real-hand reference photo, so you can see the size on a hand rather than on a ruler.

Kove marquise engagement rings

Every Kove ring is made to order in 14K or 18K gold — white, yellow or rose — with the lab-grown or natural centre stone you choose, each above 0.30 ct with its own IGI or GIA report. The designs below are on the site now:

Solène Cathedral Solitaire Marquise — A cathedral basket with four slim prongs lifts the marquise above a clean, unadorned band; drawn around a 12 × 6 mm centre stone, from 1 carat upward.
Séraphine Solitaire Marquise — A six-prong cathedral solitaire that lifts the centre diamond into the light; from 1 carat upward.
Solstice Pavé Prong Hidden Halo Marquise — A marquise of around 2 carats with a hidden halo and 56 pavé-set diamonds along the band.
Héritage Vintage Marquise — A vintage-inspired solitaire with a hand-engraved scroll band and two recessed accent diamonds.
Crescent Split Pavé Marquise — A marquise of around 1.5 carats on a split shank lined with 65 pavé accent diamonds.
Lumière Trinity Three Stone Marquise — A three-stone ring: a marquise of around 2 carats flanked by two side diamonds.
Trinity Solstice Trillion Three Stone Marquise — A marquise of around 2 carats paired with two brilliant side stones.

Choosing between a solitaire and three stones? Three-stone, toi et moi and trinity rings explained. Each ring is made by a small network of partner ateliers in up to 21 business days, often sooner, and I check every finished piece before it is delivered.

Lab-grown or natural marquise

A lab-grown diamond has essentially the same chemical composition, crystal structure, optical and physical properties as a diamond found in nature; the difference is origin, and only a gem laboratory can reliably tell them apart. GIA laser-inscribes the girdle of lab-grown stones it grades with the report number and a statement that the diamond is laboratory-grown. Source

For the shape itself nothing changes: ratio, bow-tie, symmetry and protecting the points matter in exactly the same way. At Kove you choose either — the actual certified stone, with its report — for any of the designs above.

Questions people ask

Is a marquise diamond a good choice for an engagement ring?

Yes, if she likes a long, slim look. A marquise can look larger face-up than a round diamond of the same carat weight and lengthens the finger (GIA). Its two points are the vulnerable part, so choose a setting that protects them and a stone with crisp, aligned points.

What is the best length-to-width ratio for a marquise?

It is a matter of taste. About 2:1 is the classic proportion, and most marquises submitted to GIA fall between 1.6:1 and 2.2:1. Very long stones are harder to cut well and can be less durable; very short ones can look stubby. In our sample of certified lab-grown marquise stones the median is about 1.97:1.

What is the bow-tie effect?

A darker, hourglass-shaped area across the middle of the stone that most marquise diamonds show. A slight bow-tie is normal and adds contrast; a pronounced one dims the brilliance. Look at a video of the actual stone, or see it in more than one kind of light, before you decide.

Do marquise tips chip easily?

The pointed tips are the most vulnerable part of a marquise, so they deserve protection. V-shaped prongs wrap around each point and shield it from impact, and a girdle slightly thicker at the points also helps (GIA). Ask how the points are held on the design you like.

How big does a 1 carat marquise look?

In our sample of certified lab-grown stones a 1 carat marquise has a median of 10.35 × 5.26 mm, against 6.48 mm for a 1 carat round — about 1.6 times the length. A 2 carat marquise is about 12.9 × 6.6 mm. The Solitaire Studio shows 1 to 5 carats on a real-hand reference photo.

Which setting suits a marquise?

Any setting that protects the two points: a solitaire with V-prongs, six prongs, a bezel or a halo, a split shank, or a three-stone ring, where the marquise pairs well with side stones. Kove offers cathedral solitaires, a hidden halo with pavé, a vintage engraved band, a split pavé shank and two three-stone designs.

Lab-grown marquise — any difference?

Not in how it looks or wears. A lab-grown diamond has essentially the same composition, structure, optical and physical properties as a natural one (GIA); only a laboratory can reliably tell them apart. The same checks apply: ratio, bow-tie, symmetry and protected points. At Kove you can choose either, each with an IGI or GIA report.