Does GIA give marquise diamonds a cut grade?

Not yet. Today GIA assigns an overall cut grade only to round brilliants, so a current marquise report shows polish and symmetry but not the cut grade you see on rounds. GIA has said it will begin issuing cut grades for fancy shapes from 2027, with the marquise among the first. For now, and for every stone already graded, you judge a marquise by eye and on video, not by the certificate alone.

What is the bow-tie on a marquise diamond?

It is a dark bow-shaped shadow across the centre of the stone, caused by the way light leaks through the long body of the cut. Every marquise has some bow-tie. A faint one is normal and almost invisible when worn. A heavy, opaque one kills the stone's life and you should walk away from it.

What length-to-width ratio looks best for a marquise?

Most buyers prefer somewhere between 1.85 and 2.10. Around 1.90 to 2.00 reads as the classic balanced marquise. Below 1.80 looks short and a touch fat, above 2.15 looks dramatic and thin and the tips get more fragile. Always check the ratio against the actual millimetre measurements on the report.

Are the pointed tips of a marquise easy to chip?

The two points are the most vulnerable part of any marquise, and an unprotected tip can chip on a knock. A V-prong or bezel over each point protects them. Never accept a marquise set with the tips fully exposed.

How much does a marquise diamond ring cost in South Africa in 2026?

There is no single figure, because a marquise is priced on the stone and not on the shape. Use reference points instead, and know which kind of number each one is. For a loose round of good specification you can derive it and check me: Rapaport's round brilliant list of 20 March 2026 puts G/VS1 in the 1.00 to 1.49 carat bracket at $5,400 per carat, so at 10 to 30 percent off list, R16.50 to the dollar and 15 percent VAT, a one carat estimates to roughly R72,000 to R92,000 including VAT. Rounds carry a premium over fancy shapes in the trade, so a marquise at the same colour and clarity generally sits under that, though I have no marquise list to price it from and will not invent one. Separately, three premium South African showroom listings of a finished one carat ring ran R105,000 to R428,000 across the rows I priced in July 2026, but those three were three different specifications and that figure includes a setting, so do not read it straight against a loose stone. Insist on the loose stone price and the setting price as two separate numbers, then judge the stone by eye.

Marquise Diamond Ring South Africa

Short answer: buy only a marquise you have watched move, and buy it from a manufacturer, cutting house or dealer.

The report cannot grade this shape. GIA gives a round an overall cut grade and a marquise only polish and symmetry until fancy-shape grades begin in 2027, so the bow-tie shadow that decides the stone is printed nowhere. Somebody has to tilt it under a light.
Cheaper. A retail counter buys its stones at exactly that trade level and then roughly doubles the price, about three times at a branded showroom. Same stone, one step earlier.
Better. The specification most buyers want is about five times more common at that level: 52 percent of trade-access stock against 9 percent of retail-held stock, and a thinly stocked shape at an exact length-to-width is far easier to find there.
They do the rest too. V-prongs over the points, bespoke work, resizing, tip repairs, insurance valuations and buy-back, usually on their own bench.

Go to a showroom instead if you are working to a date that will not move, you want to try five shapes on a hand this afternoon, or you want the brand and the box. Marquise points chip, so somewhere local for tip repairs matters more on this shape than on most.

Marquise diamond ring South Africa, judged the way a cutter judges it

The marquise is the one shape where the certificate tells you the least. GIA gives a round brilliant an overall cut grade. Today it gives a marquise only polish and symmetry, though that changes from 2027, when GIA begins issuing fancy-shape cut grades and the marquise is among the first in line. Until then, and for every marquise already graded, the single most important thing about a marquise diamond ring in South Africa is something the current report does not print for you: whether the stone is alive or whether it has a dead grey shadow sitting across its middle.

That shadow is the bow-tie, and it is the first thing I look for on every marquise that crosses the bench. Light enters the long body of the stone, and at the centre it leaks straight out of the bottom instead of bouncing back to your eye. The result is a darker bow shape stretched across the waist of the diamond. Every marquise has one. The question is only how bad. A faint bow-tie disappears the moment the hand moves and the stone is full of fire. A heavy one is a black smear that no setting, no light and no amount of cleaning will fix. Two marquise diamonds with identical GIA reports, same carat, same colour, same clarity, can look a class apart for this single reason. You cannot price your way around it. You have to see it, which is the trouble with most marquise sold online here: it only arrives after you have paid, having changed hands on the way to you. So the rule on this shape is simple and it decides where you buy. Buy only a marquise you have watched move, in your own hand, under a light you did not choose for you, and make sure the stone you tilted is the stone that goes into the ring.

Length-to-width is the second thing the report half-hides

A marquise looks big for its weight because the cut spreads the carat out long and thin instead of stacking it deep. That is the whole appeal. A well-spread 1ct marquise can read like a 1.25ct round across the finger. But the spread only works at the right proportions, and that comes down to the length-to-width ratio.

Take the two millimetre measurements on the report and divide the long one by the short one. Most buyers land happiest between 1.85 and 2.10. Around 1.90 to 2.00 is the classic, balanced marquise that most people picture. Drop below 1.80 and it starts to look short and a little fat. Push past 2.15 and it turns thin and dramatic, which some people love, but the tips get more fragile and the bow-tie tends to widen. Decide your ratio before you fall for a specific stone, because a beautiful 1.70 and a beautiful 2.05 are two genuinely different rings.

The tips are the weak point, so the setting is not optional decoration

The two points of a marquise are the most vulnerable spot on any diamond shape. A solid knock on an exposed tip can chip it, and a chipped tip means a recut and lost weight. This is the one place where the setting earns its keep. A V-prong cradling each point, or a light bezel over the tips, protects the stone without hiding it. I will not let a marquise leave with its points fully open to the world, and you should not accept one either. If a retailer is showing you a marquise solitaire with bare tips, that is a sign they are selling you a stone, not a ring that will survive ten years of real wear.

What a marquise actually costs in South Africa in 2026

Carat is the headline number, but on a marquise the colour, the clarity and above all the make do the real work on price. The shape adds a wrinkle of its own: rounds carry a premium in the trade, because a round wastes more rough and the demand for it is deepest, so a marquise at the same colour and clarity generally costs less per carat than a round. That is the honest bargain in a fancy shape. It is also exactly why fancy shapes are where corners get cut, since a cheaper shape is an easy place to hide a bad one.

Two reference points to price against, and they are different sorts of number. The first is arithmetic on a published list, so you can check it rather than take my word. Rapaport’s round brilliant list dated 20 March 2026 puts G/VS1 in the 1.00 to 1.49 carat bracket at $5,400 per carat, and at 10 to 30 percent off that asking list, R16.50 to the dollar and 15 percent VAT, a loose one carat round of that specification estimates to roughly R72,000 to R92,000 including VAT. A marquise of comparable colour and clarity should sit under that as a loose stone, with the setting quoted separately on top, though I have no marquise list on file and will not manufacture a figure for one.

The second is observed. My July 2026 pricing run covered 73 rows, 71 of them carrying a price, from 18 sellers, 17 of them South African and one an international online retailer, and in it three premium showroom listings of a finished one carat ring ran R105,000 to R428,000. Those three were three different specifications and that price includes a setting, while the loose estimate above does not, so the two are not comparable as they stand.

What I am not going to give you is a rand table by shape and carat weight. I have not priced marquise stones as a set, and on a shape where two diamonds with identical reports can be worth a class apart, a neat table would be invented precision dressed up as research. Do this instead: make the seller split the quote, the loose stone as one number and the setting and making as another. If the quote comes back as a single figure, ask again. A seller who will not separate them is telling you where the margin is hiding.

One more honesty note, and it needs its numbers stated properly rather than sharpened for effect. Grown marquise stones are everywhere now and the sticker is genuinely tempting. Grown prices have fallen very steeply and are still easing down, with published estimates of the fall running from about 70 percent to about 96 percent depending on the base year and the size measured, the top of that range coming from the wholesale index the trade watches for grown stones. Resale is thin on top of that: the published estimates sit at roughly a fifth to two fifths of what was paid, they vary a great deal, and some jewellers will not take a grown stone back at all. So a grown marquise is a look rather than an asset, and there is nothing wrong with buying a look provided that is what you think you are buying. This guide deals with natural stones. Worth saying, though, that the bow-tie test above applies to a grown marquise exactly as it does to a natural one. A poor make is a poor make whichever way the carbon arrived, and nobody grades it for you either way.

Where the cheap marquise sticker comes from

Here is the part the trade does not advertise, and it is not the part you have probably been told. Much of the online market lists stones it does not hold, ordering them in from a far larger catalogue once you commit. That much is ordinary. On a marquise it is arguably a service, because the shape is thinly stocked and almost no display case in the country can put three good ones in front of you to compare, while a dealer with trade access can go and find the exact length-to-width you asked for. The catch on that route is narrower than the sticker and much more specific to this shape: the bow-tie is not on the report. If nobody in the chain tilts the stone under a light before it reaches you, the one flaw that decides a marquise is discovered after the money has cleared, and it is not a flaw you can argue about afterwards, because the certificate will say the diamond is exactly what was promised.

The other cheap headline comes off a retail tray, and my own inventory work says what is usually behind it. In June 2026 I sorted 230 GIA-certified natural diamonds listed by six South African sellers by grade rather than by price. Nine percent of the retail-held stock reached D to G colour with VS2 clarity or better, against 52 percent of the stock held by sellers with trade access. On a marquise that mix is more dangerous than it would be on a round, because a downgraded marquise hides behind its own size. It looks big in the window and grey on the hand.

On price the route genuinely does matter, and the reason is the trade’s published convention rather than anything I measured. A retail counter buys its stones at trade level and then applies keystone, roughly doubling the cost, with a branded showroom running to about three times, while the hops between one trade level and the next are commonly only 3 to 5 percent. Buying one step earlier skips that single doubling at the end. That is arithmetic, and it holds whatever the shape.

What the mechanism does not do is rank two particular sellers for you, and on this shape it never could, because the make is the variable and no route guarantees a good one. So use the mechanism for the money and your own eyes for the stone. The marquise worth buying is the one somebody tilted under a light and decided to keep, and a price only means something once you have watched it move.

Where I would start for a marquise

When a reader asks me where to buy a marquise, I give them a question rather than a shop: will you show me the actual stone before I pay, and did somebody here choose it. Whether that marquise came out of a safe on the premises or was brought in on your specification matters far less than whether a person who handles stones for a living looked at it, kept it or rejected it, and will answer for it if it is wrong. Run the diamond buying checklist against whoever you are talking to, and make the appointment conditional on the stone being in the building when you arrive, so you can tilt it under the light and read the bow-tie yourself before you commit a cent.

Finding those sellers is its own small problem, and searching for a diamond dealer is not the answer, because in South Africa that phrase is barely searched and the results are not the trade. Search on what a carat costs instead. The sellers who publish per-carat prices are the ones used to being asked technical questions, and a marquise is nothing but technical questions.

A showroom is a perfectly fair choice if what you want is to try five shapes on a hand this afternoon, and that is a real thing to want. But on a marquise, where the report still cannot grade the cut, watching the stone move is the only test that counts.

If you are still weighing shapes, the oval gives you the same long, large-looking spread with no fragile tips, and the pear shares the marquise’s single-point drama with a softer body. Whichever you land on, judge the actual stone, never the certificate alone.

Marquise Diamond Ring South Africa: An Honest Buying Guide (2026)