Standing in front of a tray of diamonds, or scrolling through hundreds of rings online, it’s easy to see why so many buyers search for a diamond shapes chart before they commit to anything. Round, oval, cushion, emerald, they all look stunning in photos, but the differences in carat weight, price per carat, and how big a stone actually looks on the finger are huge, and no one tells you that upfront.

This chart lays out all ten major diamond shapes side by side, so you can compare face-up size against actual carat weight, see which shapes stretch your budget furthest, and understand why a 1 carat oval can look noticeably larger than a 1 carat round. We’ve pulled these figures from years of working with clients here in Hatton Garden, not generic averages.

Below, you’ll find a full breakdown of each shape’s proportions, typical price differences, and how they wear in popular ring settings like solitaires and hidden halos. Whether you’re set on a classic round brilliant or curious about fancy shapes like the radiant or marquise, this guide gives you the numbers to choose with confidence rather than guesswork.

1. Diamond shape vs. diamond cut: what’s the difference

Most people use "shape" and "cut" interchangeably, and honestly, most jewellers let it slide because everyone understands what you mean. But if you’re reading a diamond shapes chart or a certificate for the first time, mixing the two up will cost you money and confusion. Shape describes the outline of the stone when you look at it from above: round, oval, pear, and so on. Cut is something else entirely. It describes how well the diamond’s facets have been angled and polished to bend light back to your eye.

Here’s the practical difference. You could buy two round diamonds of identical carat weight and clarity, and one could look flat and lifeless while the other throws fire across the room, purely because of cut quality. The shape hasn’t changed. The craftsmanship has. This is why a jeweller might tell you a diamond has an "Excellent cut" even though its shape is a cushion or an emerald, not a round brilliant.

Shape is the outline you choose; cut is the craftsmanship that makes it sparkle.

Why the distinction matters when you’re shopping

The GIA cut grading scale, which runs from Excellent through to Poor, was actually developed specifically for round brilliant diamonds. Fancy shapes like ovals, pears, and cushions don’t receive an official GIA cut grade at all. Instead, you assess their quality through polish and symmetry ratings alongside proportions like table percentage and depth. This trips up a lot of first-time buyers who assume every certificate will show a neat "cut" box to tick off. For fancy shapes, you need to look a little harder, or lean on a gemologist who can read the proportions and tell you whether a stone will sparkle or sit dull on the finger.

Understanding this split changes how you shop. Once you’ve picked a shape you love, the next question isn’t "is this a good shape" but "has this specific stone been cut well within that shape". A well-cut pear will always outshine a poorly cut pear, no matter how flattering the silhouette looks in a photo. You can read more about how the GIA grades cut quality on their own site if you want the technical breakdown behind the grading scale.

Setting also plays into this conversation, though we’ll cover that shape by shape below. For now, just remember: shape is the decision you make with your eyes and your personal taste, cut is the decision you make with a certificate and, ideally, a trusted gemologist standing next to you.

2. Round diamonds

The round brilliant is the shape most people picture when they think of a diamond, and it’s still the top seller in Hatton Garden by a wide margin. It’s the oldest of the modern cuts, refined over a century of mathematical study into how facets bend light, which explains why it consistently outperforms every other shape on raw sparkle.

Facet pattern and sparkle

Standard round brilliants carry 57 or 58 facets, arranged in a pattern that’s been engineered specifically to maximise brightness and fire. Nothing else on this list comes close in terms of light return, because every other shape involves some compromise between facet arrangement and silhouette. This is why round remains the benchmark against which fancy shapes get compared.

If sparkle is your top priority, the round brilliant still wins on pure light performance.

Size and price compared to other shapes

Because round cutting wastes more of the rough stone than fancy shapes, you’ll pay a premium per carat, often 25 to 35% more than an oval or cushion of identical quality. Round diamonds also face up slightly smaller than elongated shapes at the same carat weight, since the weight sits in depth rather than spread across the surface.

Ideal ring settings

Round stones suit almost every setting style, from classic solitaire to hidden halo to three-stone designs. Their symmetry means they sit evenly in prong settings without awkward gaps, and pairing them with a plain or pavé band rarely goes wrong.

Best suited to

Couples who want a timeless, universally recognised shape should look here first. Buyers prioritising resale value and maximum sparkle over budget stretching will find round diamonds the safest, most versatile choice on this entire chart.

3. Oval diamonds

The oval diamond has grown into one of the most requested fancy shapes in Hatton Garden over the past few years, and it’s easy to see why. It keeps the brilliant faceting pattern of a round stone but stretches it into an elongated silhouette that flatters the finger and looks larger than its carat weight suggests. Elizabeth Taylor’s famous 33 carat oval didn’t hurt its popularity either.

Facet pattern and sparkle

Ovals use the same brilliant-cut facet arrangement as round diamonds, typically 56 to 58 facets, which means they sparkle almost as well while offering a different outline. The one thing to watch for is the "bow-tie" effect, a dark shadow that can appear across the centre of the stone depending on how the cutter has proportioned the depth and facets. A well-cut oval minimises this, so always check images or view the stone in person before buying.

A well-cut oval gives you round-diamond sparkle in a shape that looks noticeably bigger.

Size and price compared to other shapes

Because ovals spread weight across a larger surface area rather than concentrating it in depth, they face up 10 to 15% larger than a round diamond of identical carat weight. Pricing follows a similar logic to cushion cuts, sitting comfortably below round diamonds per carat.

Ideal ring settings

Ovals pair beautifully with a hidden halo, which adds sparkle underneath the stone without interrupting the elongated line from above. A simple solitaire also works well, especially with a slightly tapered band that draws the eye along the diamond’s length rather than competing with it.

Best suited to

Buyers who want their carat weight to work harder visually, without sacrificing the brilliance of a round cut, should seriously consider an oval. It also suits anyone with slimmer fingers, since the elongated shape tends to create a flattering, lengthening effect that round or cushion stones simply can’t match.

4. Cushion diamonds

The cushion diamond has been around longer than almost any other fancy shape, dating back to the 19th century when it was known as the "old mine cut". Modern cushions have been refined with better proportions and brighter faceting, but they keep that soft, pillow-like outline with rounded corners that gives the shape its name. It’s a popular choice for buyers who want something a bit different from round but still classic enough to feel timeless.

Facet pattern and sparkle

Cushions typically carry 58 to 64 facets, and you’ll find two main styles on the market: chunky facet cushions, which show larger, more open flashes of light, and crushed ice cushions, which create a scattered, glittery look similar to broken glass. Neither is better, it genuinely comes down to personal taste. Because the corners are rounded rather than pointed, cushions handle inclusions a little more forgivingly than emerald or asscher cuts, so you can often drop a clarity grade without visible impact.

Cushion cuts give you vintage character with modern brilliance, and they’re forgiving on clarity too.

Size and price compared to other shapes

Cushions sit close to round diamonds in face-up size at the same carat weight, since the outline isn’t as elongated as an oval or pear. Pricing, however, comes in noticeably lower, typically 15 to 20% less per carat than an equivalent round, because more of the rough stone survives the cutting process.

Ideal ring settings

Cushion diamonds look striking in halo settings, where the rounded outline of the halo echoes the soft corners of the stone itself. Vintage-inspired milgrain bands and split-shank settings also complement the antique feel that cushions naturally carry.

Best suited to

Someone drawn to vintage aesthetics without wanting an actual antique stone will find cushions hit the mark perfectly. They also suit buyers stretching a budget who still want a shape that reads as classic rather than obviously alternative, since cushions blend elegance with genuine cost savings over round.

5. Princess diamonds

The princess cut is the second most popular shape after round, and it’s the shape most people picture when they think of a modern, geometric engagement ring. It emerged in the 1980s as a way to give buyers brilliant sparkle in a square outline, and it’s stayed a firm favourite ever since because it manages to look both contemporary and classic at once.

Facet pattern and sparkle

Princess cuts typically carry 76 facets, more than almost any other shape on this chart, arranged in an inverted pyramid beneath the surface. That extra faceting gives princess diamonds sparkle that rivals round brilliants, though the sharp corners can leak a little light compared to a round stone’s uninterrupted curve. Those same pointed corners are also the shape’s weak point physically, since they’re more prone to chipping if knocked, so a protective setting matters more here than with rounded shapes.

Princess cuts pack round-level brilliance into sharp, modern corners, but those corners need protecting.

Size and price compared to other shapes

Princess diamonds face up close to their actual carat weight, sitting between round and cushion in visual size at the same weight. Pricing sits well below round, typically 20 to 25% less per carat, because the square shape is cut from the rough stone with far less wastage than a round brilliant.

Ideal ring settings

Four-prong settings that cap each corner are essential for princess cuts, since exposed corners are the most vulnerable part of the stone. A bezel or channel-set band offers even more protection, and pairing the diamond with a matching square halo tends to create a clean, architectural look that suits the shape’s geometry.

Best suited to

Buyers who want a modern, angular alternative to round without stretching their budget will find princess cuts hard to beat. It’s also a strong pick for anyone who works with their hands regularly, provided the setting protects those corners properly.

6. Pear diamonds

The pear diamond is sometimes called a teardrop, and it’s genuinely one of the most distinctive shapes on this chart. It combines the rounded end of an oval with the tapered point of a marquise, which makes it instantly recognisable and a favourite for buyers who want something with real personality rather than a conventional outline. Grace Kelly’s engagement ring featured an emerald cut, but plenty of other royal and celebrity pieces have leaned on the pear shape for exactly this reason.

Facet pattern and sparkle

Pears typically carry 58 facets in a brilliant cutting style, so they sparkle almost as strongly as a round diamond while offering an outline nobody else on the tray has. Like ovals, they’re prone to a bow-tie effect across the centre, and the point at the tip needs careful proportioning by the cutter, since a poorly angled point can look weak or oddly narrow when viewed face-up.

Pear diamonds reward careful cutting; get the point and curve right, and the sparkle rivals a round brilliant.

Size and price compared to other shapes

Pears face up larger than round diamonds at equivalent carat weight, similar to ovals, because the elongated shape spreads weight across more surface area. Pricing sits comfortably below round, typically 15 to 20% less per carat, making it a strong option if you want a distinctive silhouette without paying the round premium.

Ideal ring settings

A solitaire with a V-tip prong protects the pointed end, which is the most vulnerable part of the stone and needs proper coverage to avoid chipping. Hidden halos also work well here, adding sparkle beneath the curve without competing with the distinctive outline above.

Best suited to

Anyone wanting a shape that stands out from the round, oval, and cushion crowd should look at pears seriously. It also suits buyers who like the idea of wearing the diamond with the point facing towards the hand, a styling choice that visually elongates the finger and gives the ring a slightly more dramatic presence.

7. Emerald diamonds

The emerald cut takes its name from the step-cutting technique originally developed for emeralds themselves, since the gemstone is more prone to cracking under brilliant faceting than diamond is. That rectangular, layered outline gives it a cool, architectural elegance that’s completely different from anything brilliant-cut. Grace Kelly’s engagement ring, mentioned earlier, put this shape firmly on the map, and it’s stayed a favourite with buyers who want understated glamour over maximum sparkle.

Facet pattern and sparkle

Emeralds use a step-cut facet pattern, long, rectangular facets arranged in parallel rows rather than the triangular kite shapes you see in brilliant cuts. This produces a hall-of-mirrors effect, flashes of light rather than constant fire, which is quieter and more sophisticated than a round or princess cut. Because the large open table sits close to the surface, any inclusions are far more visible here than in other shapes, so clarity matters more with an emerald than almost anywhere else on this chart.

Emerald cuts trade sparkle for clarity of line, so never skimp on clarity grade when buying one.

Size and price compared to other shapes

Emeralds face up larger than round diamonds at the same carat weight, thanks to their elongated, spread-out silhouette. Pricing sits below round, typically 10 to 15% less per carat, a smaller discount than you’ll see on ovals or pears because emerald-cut rough yields less waste but demands more precision from the cutter.

Ideal ring settings

A classic solitaire with trapeze side stones highlights the clean lines of an emerald beautifully, while a plain band keeps attention on the stone’s geometry rather than adding competing sparkle.

Best suited to

Buyers drawn to Art Deco styling and quiet elegance over maximum brilliance will love emeralds. It suits anyone who prioritises a flawless, eye-clean stone above raw sparkle, since the open facets leave nowhere for inclusions to hide.

8. Marquise diamonds

The marquise cut is instantly recognisable by its long, narrow silhouette with pointed ends, sometimes called the "boat shape" or "football cut" because of the way it curves outward at the centre. Legend has it Louis XIV commissioned the shape to resemble the smile of his mistress, and whether that’s true or not, the marquise has carried a sense of drama and history ever since. It’s less common on the tray than round or oval, which makes it a strong pick for buyers who want something genuinely distinctive.

Facet pattern and sparkle

Marquise diamonds carry 56 to 58 facets in a brilliant cutting style, so they throw plenty of fire despite the elongated outline. The pointed ends need careful attention from the cutter, since poor symmetry between the two tips creates an obvious, lopsided look that’s hard to ignore once you’ve spotted it. Bow-tie effect shows up here too, often more visibly than on ovals or pears, so always check the stone in natural light before buying.

A marquise diamond’s drama depends entirely on symmetry between its two pointed ends.

Size and price compared to other shapes

Marquise diamonds face up larger than any other shape on this chart at the same carat weight, since almost all the weight spreads across the surface rather than sitting in depth. Pricing sits well below round, typically 15 to 25% less per carat.

Ideal ring settings

A solitaire with V-tip prongs at both points protects the vulnerable tips, mirroring the same protection a pear cut needs. Curved or contoured bands also work well, following the natural sweep of the stone’s outline.

Best suited to

Buyers chasing maximum apparent size for their budget should put marquise near the top of the list. It also suits anyone confident enough to wear a statement shape that few other people at the party will have.

9. Radiant diamonds

The radiant cut was developed in the 1970s specifically to combine the sparkle of a round brilliant with the sharp, rectangular outline of an emerald cut. It’s essentially a hybrid shape, cropped corners like a princess cut but faceted like a round, which makes it one of the most versatile fancy shapes on this chart. You’ll see radiants in both square and rectangular proportions, giving buyers more flexibility over the finished look than almost any other shape here.

Facet pattern and sparkle

Radiants typically carry 70 facets, arranged in a brilliant-cut pattern adapted to fit the rectangular or square outline. That faceting gives radiants noticeably more fire than an emerald cut, while the trimmed corners mean they’re far more durable than a princess cut with exposed points. Inclusions hide reasonably well here too, since the busy facet pattern breaks up light in a way that camouflages small flaws better than a step-cut stone would.

Radiant diamonds give you emerald-style corners with round-level sparkle, a genuine best-of-both option.

Size and price compared to other shapes

Radiants face up close to their actual carat weight, sitting somewhere between round and emerald depending on the exact ratio chosen. Pricing sits comfortably below round, typically 15 to 20% less per carat, which puts it in similar territory to a cushion cut.

Ideal ring settings

A four-prong solitaire with corner protection suits radiants well, since the cropped corners, while sturdier than a princess cut, still benefit from coverage. Pairing the stone with a matching halo or a plain tapered band both work nicely, depending on whether you want extra sparkle or a cleaner, more architectural finish.

Best suited to

Anyone torn between the sparkle of a brilliant cut and the geometry of an emerald should try a radiant before deciding either way. It also suits buyers who work with their hands, since the trimmed corners handle daily knocks far better than a true princess cut manages.

10. Asscher diamonds

The Asscher cut was patented in 1902 by the Asscher brothers in Amsterdam, decades before emerald or radiant cuts existed, and it’s often mistaken for a square emerald because the two shapes share the same step-cut heritage. Look closer and you’ll spot the difference: an Asscher has larger step facets, a higher crown, and famously cropped corners that give it an almost octagonal outline. It fell out of fashion for much of the 20th century before Art Deco revivalists brought it firmly back into any serious diamond shapes chart you’ll find today.

Facet pattern and sparkle

Asschers use a step-cut facet pattern similar to emeralds, but with deeper pavilion cuts and a smaller table, which creates a hypnotic hall-of-mirrors effect rather than scattered brilliance. Because the open table sits so close to the surface, inclusions and even slight colour tints show up more readily than in brilliant-cut shapes, so clarity and colour grade both deserve extra attention here.

An Asscher’s beauty lies in depth and clarity of line, not raw sparkle, so buy the best clarity grade you can afford.

Size and price compared to other shapes

Asschers face up slightly smaller than round diamonds at equivalent carat weight, since the deep pavilion concentrates weight below the surface rather than spreading it wide. Pricing sits below round, typically 10 to 15% less per carat, comparable to emerald cuts.

Ideal ring settings

Bezel settings suit Asschers beautifully, echoing the geometric symmetry of the stone while protecting its corners. A classic four-prong solitaire with a plain or milgrain band also works well if you want the step facets to remain the clear focal point.

Best suited to

Buyers who love vintage Art Deco design but want something rarer than an emerald cut should look here first. It also suits anyone who values clarity and craftsmanship over sheer sparkle, since the Asscher rewards close inspection rather than distant dazzle.

11. Heart diamonds

The heart-shaped diamond is the boldest statement on this entire chart, an unmistakable symbol of romance cut into a shape that needs zero explanation. Cutting a symmetrical heart from rough diamond is one of the hardest jobs a cutter can take on, which is partly why heart shapes stay rarer on the tray than round or oval. Fewer cutters have the skill to attempt it well, so when you find a good one, the craftsmanship behind it is genuinely impressive.

Facet pattern and sparkle

Hearts typically carry 56 to 58 facets in a brilliant cutting style, giving them sparkle comparable to a round diamond despite the unconventional outline. Getting the two lobes perfectly symmetrical, along with a clean, well-defined cleft at the top, takes real precision, and any imbalance is obvious the moment you look at the stone face-up.

A heart diamond lives or dies on symmetry between its two lobes, so inspect that cleft closely before buying.

Size and price compared to other shapes

Heart diamonds face up close to round diamonds in visual size at equivalent carat weight, though larger stones (above 1 carat) tend to display the shape more clearly than smaller ones, where the heart outline can look less defined. Pricing sits below round, typically 15 to 20% less per carat.

Ideal ring settings

A three-prong solitaire that grips the cleft and both lobes protects the shape’s most delicate points while keeping the outline fully visible. Simple bands work best here, since the shape itself already carries plenty of visual interest without extra embellishment competing for attention.

Best suited to

Couples who want their ring to make a clear, sentimental statement should consider hearts seriously. It suits confident buyers rather than those wanting something understated, since everyone who spots the ring will immediately understand exactly what shape they’re looking at.

12. How to choose the right diamond shape for you

Decisions get easier once you stop asking which shape is "best" and start asking which shape fits your priorities. Every stone on this diamond shapes chart trades something for something else: sparkle for silhouette, size for durability, budget for brilliance. Nobody can tell you which trade-off matters most except you, but a few honest questions will narrow the field fast.

Start with lifestyle. If you work with your hands, a shape with exposed corners or points, like a princess, pear, or marquise, needs a protective setting or it will chip within a few years. Finger shape matters too: elongated shapes like oval, marquise, and pear tend to flatter shorter or wider fingers, while round and cushion sit neutrally on any hand shape.

Choose the shape that matches how you actually live, not just how it photographs on someone else’s finger.

Budget is the next filter, and it’s often the deciding one. If carat weight and visible size matter more to you than sparkle, an oval, pear, or marquise stretches your money furthest. If maximum brilliance is non-negotiable, budget for the round premium and accept a slightly smaller face-up size for the same spend.

Run through this quick checklist before you commit:

• Lifestyle: active hands need protected corners (princess, radiant, heart)
• Budget: elongated shapes (oval, pear, marquise) maximise apparent size per pound
• Personality: distinctive shapes (heart, asscher, marquise) suit confident wearers; classic shapes (round, cushion) suit understated tastes
• Setting preference: solitaires suit almost any shape; halos flatter cushions and pears especially well

Ultimately, no chart replaces holding a few shapes under proper lighting and seeing which one catches your eye without effort. That reaction, more than any spec sheet, usually tells you everything you need to know.

Finding the shape that’s right for you

Ten shapes, ten different personalities, and no single winner. A diamond shapes chart gives you the numbers, carat weight, face-up size, price per carat, but it can’t tell you which outline will make you smile every time you glance down at your hand. That part comes from actually seeing the stones, comparing sparkle against silhouette, and being honest about your budget and lifestyle rather than chasing what looks best in someone else’s engagement photos.

Understanding these trade-offs puts you well ahead of most buyers walking into a jeweller for the first time. You now know why an oval reads larger than a round, why princess corners need protecting, and why an emerald cut demands a higher clarity grade. That knowledge turns a stressful decision into a straightforward one.

If you’re ready to see how these shapes actually look and sparkle in person, book a consultation with our team in Hatton Garden and we’ll help you find the one that’s right for you.