What are the different diamond shapes?

Ten shapes cover almost everything sold. The round brilliant is the reference. The fancy shapes, meaning every shape that is not round, are oval, princess, cushion, emerald, pear, marquise, radiant, asscher and heart. Baguette, trillion and old cuts such as the old European turn up mostly as side stones or in antique pieces. Each shape belongs to one of three faceting families: brilliant cuts, which are faceted for sparkle, step cuts, which are faceted in long parallel rows for a clear glassy look, and mixed cuts, which borrow from both. The family tells you more about how a stone behaves than the outline does.

What is the difference between diamond shape and diamond cut?

Shape is the outline, meaning round, oval, pear and so on. Cut is how well the stone was made: the angles, the proportions, the polish and the symmetry that decide whether light comes back to your eye or leaks out of the bottom. They are two different things and the trade uses the word cut for both, which is why buyers confuse them. You choose the shape on taste, and no shape is better than another. You judge the cut on quality, and here the differences are enormous and directly visible. Two stones of the same shape, weight, colour and clarity can look like different products because of it.

Which diamond shapes does GIA give a cut grade to?

Only the round brilliant. A GIA report on a round carries an overall cut grade from Excellent down to Poor. A report on an oval, pear, marquise, princess, cushion, emerald or any other fancy shape does not. Those reports still give colour, clarity, carat, measurements, depth and table percentages, girdle thickness, polish and symmetry, but no overall verdict on the cut. GIA has said it will begin issuing fancy-shape cut grades from 2027, starting with the marquise, oval and pear. That does nothing for the millions of stones already graded, or for shapes further down the queue.

Which diamond shape is the cheapest?

At the same colour, clarity and carat weight, fancy shapes generally cost less per carat than a round, and the shapes that follow the natural rough crystal most closely, such as the princess, sit lowest. The reason is physical rather than commercial. Turning rough into a round brilliant destroys the most weight, and you pay for the carats that ended up as dust. A shape that keeps more of the crystal costs the cutter less per finished carat. That is a real saving. What it is not is a licence to compare a low headline price against a high one, because the cheap ticket usually carries lower colour and clarity as well as a different outline.

Which diamond shape sparkles the most?

A well cut round brilliant returns the most light, which is why it is the reference every other shape is judged against. Its facet arrangement was designed for exactly that. Oval, pear, marquise, radiant and cushion are also brilliant cuts and can sparkle hard when well made, but they vary far more stone to stone because nothing on the report ranks them. Step cuts, meaning emerald and asscher, are not trying to sparkle at all. They give broad flashes and a clear look through the table, which is a different pleasure and the reason people choose them.

Which diamond shape looks the biggest for its carat weight?

Elongated shapes look largest face-up because they spread their weight along the length of the stone rather than stacking it below the girdle. Marquise reads largest for its weight by a clear margin, with oval and pear close behind at roughly 8 to 12 percent more face-up spread than a round of identical weight. Deep cushions read smallest. Face-up size is measured in millimetres on the report, not in carats, so ask for the measurements line and compare it against a carat-to-millimetre chart rather than trusting the weight on the ticket.

Which diamond shape is best for everyday wear?

Shapes with no sharp extremity survive daily wear best. Round, oval and cushion have no point or corner to catch, so they are the most forgiving. Princess cuts have four sharp ninety-degree corners, emerald and asscher cuts have four corners that are cropped but still vulnerable, and pear and marquise cuts have exposed points. Diamond is the hardest natural material but it is not the toughest, and a sharp extremity can chip on a knock. None of those shapes is a bad choice, but each needs a setting that covers the weak spot, usually V-tip prongs or a bezel.

How do I judge the cut of a fancy shape if there is no cut grade?

You read the proportions yourself and then you look at the stone. On the report, check the measurements line and work out the length-to-width ratio, check the depth percentage for weight hidden below the girdle, and read the girdle thickness because an extremely thin girdle on a pointed or cornered shape is a chip risk. Then judge what the report cannot describe: watch the stone tilt in daylight and look for a fixed dark band across the centre, a bow-tie, or a window you can see straight through. Compare two candidate stones side by side. That is the substitute for the missing grade.

Diamond Shapes and Cuts | Natural Diamond

Bottom line up front

There are ten diamond shapes that account for almost everything sold. The round brilliant is one of them. The other nine are called fancy shapes, which simply means not round: oval, princess, cushion, emerald, pear, marquise, radiant, asscher and heart. Below those sit shapes you will mostly meet as side stones or in antique jewellery, chiefly the baguette, the trillion and old cuts such as the old European and the old mine.

Now the part that decides whether you buy well, and that most shape guides skip entirely.

Shape and cut are not the same thing. Shape is the outline. Cut is how well the stone was made: the angles, the proportions, the polish, the symmetry, everything that decides whether light comes back out of the top or leaks away through the bottom. The trade uses the word cut for both, which is where the confusion starts. Shape is a taste decision with no right answer. Cut is a quality decision with a very clear one, and it is worth more to how a diamond looks than colour and clarity put together.

Here is the consequence. GIA issues an overall cut grade for one shape only: the round brilliant. Ask for a report on an oval, a pear, an emerald cut or a princess and you get colour, clarity, carat, measurements, polish and symmetry, and no cut grade at all. On every fancy shape, the single most important quality of the stone is the one line the certificate does not print. You either learn to read the proportions yourself, or you are trusting a stranger about the thing that matters most.

That gap is the honest reason people overpay for fancy shapes, and this page is built around closing it.

Which also answers where to buy a fancy shape, a question that missing line of paper makes sharper than usual.

Go to a manufacturer, cutting house or dealer. On a shape the laboratory declines to grade, you want somebody who will lay three candidates on a tray under one lamp and let you compare them, not sell you the one already in the window.
It costs less there. A retailer buys its stones at that same level and then applies keystone, roughly doubling the price, about three times at a branded name, while the steps inside the trade run 3 to 5 percent a hop.
They make it, and they keep it going. The mount is built around the stone you actually chose, and the resizing, re-tipping, repairs and insurance valuations afterwards are bench work. Most cutting houses, manufacturers and dealers run a bench or work with one, and that is where a retail counter sends the same jobs.

Go to a showroom instead if the ring has a date on it, if seeing a dozen finished shapes on a real hand and walking out with one is how the outline gets chosen, or if the name on the box is part of what is wanted.

The three faceting families, which matter more than the outline

Before the individual shapes, learn the grouping. It explains more about how a diamond behaves than its silhouette does.

Brilliant cuts are faceted with dozens of small triangular and kite-shaped facets arranged to bounce light back at you. Round, oval, pear, marquise, radiant, cushion and heart are all brilliant cuts. They sparkle, they scatter, and that busy light hides small inclusions and slight tints well.

Step cuts are faceted in long parallel rows running down to the culet, like steps. Emerald, asscher and baguette are step cuts. They do not scatter light, they flash it in broad planes and give you a clear view straight into the stone. That is the architectural, glassy, Art Deco look, and it comes with a cost: an open table hides nothing, so inclusions and body colour that would vanish in a brilliant cut are plainly visible.

Mixed cuts borrow from both, most commonly a brilliant-faceted crown over a step-cut pavilion. The princess is the best known.

Once you know the family, a lot of buying advice writes itself. A step cut needs cleaner clarity to look right. A brilliant cut is more forgiving on clarity and colour but far more variable in how well it is made.

Shape is not cut, and only one shape gets graded

The round brilliant is not the most popular shape because it is prettiest. It is the most popular shape because it is the only one where a laboratory will tell you whether the stone was made properly.

A round brilliant is cut to a well-understood set of proportions, so GIA can grade it against a standard and print Excellent, Very Good, Good, Fair or Poor on the report. That grade does an enormous amount of work for a buyer. It means two round brilliant certificates are genuinely comparable. Our round brilliant guide covers what to demand once you have that grade to lean on.

For fancy shapes there is no single agreed formula for a good stone, and so no grade. There is no ideal oval, only ovals people like. That is a defensible position for a laboratory and a difficult one for a buyer, because the variation between a superb fancy shape and a lifeless one is far wider than the variation between an Excellent and a Very Good round. The report goes silent exactly where the spread is widest.

GIA has said it will begin issuing cut grades for fancy shapes from 2027, starting with the marquise, oval and pear. Treat that as a future improvement rather than a solution. It will not retrospectively grade the stones already sitting in South African safes and display cases, and the step cuts sit further back in the queue. Anyone buying a fancy shape now is still doing the grading themselves.

What to read when there is no cut grade

This is the practical payoff. A fancy-shape report is not blank. It carries several lines that tell you a great deal if you know what to do with them. Use them to compare candidate stones against each other, not against an absolute pass mark, because no published pass mark exists.

The measurements line. Length, width and depth in millimetres. Divide length by width and you have the length-to-width ratio, which decides the entire character of the stone. Each of the shape guides on this site gives the ratio range most buyers prefer for that shape, and they differ sharply.
Depth percentage. This is where hidden weight shows up. A stone carrying a lot of its weight below the girdle hits the carat figure on the scale while facing up small. On most fancy shapes a depth much above about 70 percent is worth questioning, because you are paying for a belly nobody will ever see. The size guide sets out how weight and face-up spread come apart.
Table percentage. Read it alongside depth rather than on its own. A very large table on a brilliant cut tends towards a flat, glassy look; a very small one towards darkness at the centre.
Girdle thickness. This is the line almost nobody reads and the one that predicts breakage. An extremely thin girdle on a shape with a point or a corner, which means pear, marquise, princess, heart, emerald or asscher, is a chip risk sitting in plain sight on a document that supposedly says nothing about cut. It says plenty.
Polish and symmetry. Graded on every shape, fancy included. They are not a substitute for a cut grade, but poor symmetry on a shape that has to mirror itself down an axis, such as a pear or a heart, is visible to the naked eye and is a reason to move on.
The clarity plot. Where the inclusions sit matters more than the grade letter, and on step cuts it matters most of all.

Then do the thing no report can do. Tilt the stone in ordinary daylight, not under a display case spotlight, and look for two faults: a bow-tie, meaning a dark band fixed across the centre that does not move as the stone moves, and a window, meaning a patch you can see straight through to whatever is behind it. Both are cutting faults. Neither appears anywhere on a certificate. Both are obvious once you know to look, and both are why a fancy shape should be seen before it is paid for. The GIA report guide walks through verifying the document itself, and the glossary defines the terms above.

Diamond shapes compared

Prices in the second column are the discount ranges commonly quoted in the trade against a round brilliant at matched colour, clarity and carat weight. They are a market convention that moves with demand, not a figure measured in our own data, so treat them as orientation for negotiation rather than a quote.

Shape	Price vs a round at matched spec	Everyday wear	What specifically goes wrong	Check this first
Round brilliant	The reference. Dearest per carat	Excellent. No point or corner	Very little, but Excellent covers everything from superb to ordinary	The cut grade, then whether it beats another Excellent in daylight
Oval	Roughly 10 to 25 percent less. The narrowest discount of the fancy shapes because demand is high	Excellent. No weak point	A bow-tie across the waist, and shallow stones cut wide to look big and read flat	The bow-tie on a moving stone, then the length-to-width ratio
Princess	Roughly 10 to 40 percent less. Often the lowest of the common shapes	Poor without protection. Four sharp ninety-degree corners	Corners chip or cleave on a knock, and a chip usually means a recut and lost weight	The girdle thickness at the corners, and that the setting has V-tips or a bezel
Cushion	Roughly 20 to 35 percent less	Excellent. Soft rounded corners take knocks well	The crushed-ice look: a mass of tiny facets that glitters but goes watery, and conveniently masks tint and inclusions	Whether it is chunky or crushed-ice, decided before you shop
Emerald	Roughly 20 to 35 percent less	Good. Corners are cropped but still the weak point	The open step-cut table shows every inclusion and any body colour, and a badly proportioned one windows straight through	The clarity plot for anything under the centre of the table
Pear	Roughly 15 to 30 percent less	Fair. One exposed point	A bow-tie, plus asymmetry down the long axis. A shoulder bulging on one side is common and obvious once seen	That the point is covered by the setting, and that both sides mirror
Marquise	Roughly 20 to 35 percent less	Fair. Two exposed points	The heaviest bow-tie risk of any shape, because the long thin body leaks light at the centre	The bow-tie under a moving light. Reject a fixed black band
Radiant	Roughly 20 to 35 percent less	Good. Cropped corners	Cut deep to hold weight, so it faces up smaller than its carat suggests	The depth percentage against the millimetre spread
Asscher	Roughly 20 to 35 percent less	Good. Cropped corners	Same as the emerald cut, worse. A square step cut with a small table shows inclusions and darkens easily	Clarity, then whether the concentric squares stay crisp as it tilts
Heart	Roughly 15 to 30 percent less	Poor. A point plus a cleft	Asymmetry between the two lobes, and the shape becomes hard to read below about 0.75 carat	Symmetry between the lobes, and that the cleft is well defined

Baguettes and trillions belong in a separate category. They are accent stones, cut to flank a centre diamond rather than to be one, and they are priced and judged as a matched set rather than individually.

Why fancy shapes cost less, and why that is a real saving

The discount is not a marketing device and it is not a quality signal. It is physics at the cutting wheel.

Rough diamond crystals commonly form as octahedra, two square pyramids joined base to base. Turning that crystal into a round brilliant means grinding away the corners and cutting a circle out of a square, and the cutter loses roughly 60 percent of the weight to dust. You pay for every one of those lost carats, because the polished stone has to carry the cost of the rough it came from.

A shape that follows the crystal more closely wastes less. A princess cut is close to the natural outline of the rough, and trade figures commonly put its yield at around twice that of a round. Emerald cuts, radiants and the elongated brilliants sit in between. Less waste per finished carat means a lower price per finished carat, and that is passed on.

So the saving is genuine. It comes from the cutting floor, not from a lower-quality stone, and at matched colour, clarity and weight you really are paying less for the same goods in a different outline. On top of that, the elongated shapes hand you a second saving: they face up larger than a round of the same weight, so you can drop a little carat weight, hold your colour and clarity, and still read as a bigger stone.

Two honest qualifications. First, the discount narrows when a shape is fashionable. Oval demand has been strong for years and the oval discount is now the thinnest of the fancy shapes. Second, and more important, cheaper per carat is not the same as cheaper for what you see. A round at Excellent cut has a floor under its light performance. A fancy shape has none, so part of that discount is compensation for risk you now carry yourself. Spend some of the saving on a better make rather than on more weight, and you come out ahead.

Where the discount stops being a bargain

The trap is comparing a low headline against a high one and calling the difference a saving. It usually is not the same stone.

The relevant number is what is actually in the case. In June 2026 I listed 230 GIA-certified natural diamonds offered by six South African sellers and split them by where the stone was physically held. Of the stones reachable through trade access, 52 percent were D to G in colour with VS2 clarity or better. Of the stock held in South African retail, 9 percent were. That is a comparison of inventory composition and not of price, and it says nothing about what either route charges. What it does say is that the pool most buyers shop in is overwhelmingly lower specification, by a factor of about five, so a cheap ticket is far more often a downgraded stone than a discounted one.

That lands harder on some shapes than others. A step cut needs cleaner clarity to look right at all, and it is being asked to shop in the part of the market where roughly one stone in eleven meets premium specification. A crushed-ice cushion has the opposite problem: it hides a tint and a feather so well that a downgraded stone still photographs beautifully.

The gap between a trade-level price and a counter price is published convention rather than anything I uncovered. Retail runs on keystone, meaning the counter price is roughly double what the stone cost the counter, and a branded showroom goes to about three times, while margins between one trade level and the next are commonly 3 to 5 percent. The doubling pays for rent, stock, staff and insurance, not for anything that happened to the diamond.

Making the decision

Work in this order and the choice gets much smaller.

Pick the family first. Do you want sparkle or clarity of form? Brilliant cut or step cut. This single question eliminates most of the list and it is pure taste.
Rule out on wear. If the ring will be on a hand that works, cooks and gardens every day, a point or a sharp corner is a standing liability. Round, oval and cushion have none. Everything else needs a setting decision made before the ring is built, not after.
Decide how much certainty you want on paper. If you want a laboratory to tell you the stone was made properly, there is exactly one answer and it is the round brilliant. If you are willing to do that work yourself, the fancy shapes are where the value is.
Set the length-to-width ratio before you shop. For elongated shapes this decides which stones are even worth viewing, and it halves the search.
Then price it, on one fixed specification across every seller you approach.

Do not skip step five, and do not let anyone hold the specification loose while quoting. Fix the shape, the carat, the colour, the clarity and the report, and only then compare rands.

The price question, which is the one worth searching

Once the shape is chosen, everything else is a price conversation, and this is where most buyers ask the wrong question of a search engine.

Searching for a diamond dealer, or a diamond wholesaler in Johannesburg, is close to useless here. Those terms carry almost no South African search volume and the results do not contain the kind of seller who will put a fancy shape on a tray and let you read its bow-tie. Ask the question you actually want answered instead. Search 1 carat diamond price, or diamond price per carat South Africa, and see who answers with a figure in rands. A seller who publishes a per-carat number has agreed to be measured on it, and on a shape where the report withholds the cut grade you want everything else about the transaction to be measurable.

For the numbers themselves, the South African diamond price index sets out the studies and the method, and what a diamond costs in South Africa breaks down where the money goes between the stone and the counter. In short: a loose one carat at G colour and VS1 clarity works out at roughly R72,000 to R92,000 including VAT, taking 10 to 30 percent off the Rapaport round list of 20 March 2026, which puts that grade at $5,400 per carat, converting at 16.50 rand to the dollar and adding 15 percent VAT. A one carat ring in a premium South African showroom ran R105,000 to R428,000 in a July 2026 study of 73 rows, 71 of them priced, across 18 sellers, 17 of whom are South African. Do not read those two figures as the same object. The showroom number is a finished ring with a setting inside it, the loose number is a bare stone, and the showroom band rests on three listings of three different specifications, so it says what a counter charges for “a one carat ring” rather than what one specification costs three times over. What the width of each band is really showing you is specification doing the work, and the distance between them is mostly the retail step rather than the diamond.

What this page does not know

It does not know what any specific stone in front of you is worth, and no page can. The discount figures in the table are trade convention rather than measurement, and they move with fashion. The one carat rand band above is an estimate built on a published list plus an assumed 10 to 30 percent discount off it, and it covers round brilliants only, because that is the list on file. Do not carry it across to a fancy shape without the corresponding list. The 52 percent against 9 percent split describes what six sellers listed on one day in June 2026 and is a statement about inventory, not about price. Nothing here tells you whether a particular oval has a bow-tie, because that fact exists only in the stone. Get the report, read the six lines above, then look at the diamond in daylight.

Diamond Shapes and Cuts (2026): The Full List, and Why Shape Is Not Cut