Rare Diamond Cuts for Engagement Rings: Asscher, Kite, Hexagon, Moval, Marquise, Old Mine, and Portuguese Explained

Detailed Answer

[Published: May 2026]

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Why rare cuts are becoming a real conversation in India

For most of the lab-grown diamond market's growth in India, the shape conversation stayed simple. Round brilliant for maximum sparkle. Oval for visual size. Cushion for warmth. These shapes dominate because they are easy to manufacture, easy to certify, and easy to photograph for e-commerce.

Rare cuts are different. A kite-shaped diamond requires a cutter to work against the natural efficiency of the rough. A hexagon has to be proportioned carefully or it looks like a geometric experiment rather than a fine stone. An old mine cut is, by definition, not optimised for light return by modern standards. These are choices that trade some degree of technical performance for something harder to quantify: character, distinctiveness, history.

The shift happening now is that lab-grown production makes these cuts more accessible. When you are not cutting a rare mined rough, the cost of producing a kite or hexagon or moval drops considerably. Indian brands and some international ones shipping to India have started making these shapes available at price points that would have been unthinkable five years ago for equivalent carat weights.

What has not kept pace is the educational content. Buyers searching for these cuts in India find product pages, not explanations. This guide tries to fill that gap.

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The Asscher cut: the most misunderstood step cut in the market

What it is

The Asscher cut was created in 1902 by Joseph Isaac Asscher of the Royal Asscher Diamond Company in Amsterdam. It is a square step cut with deeply trimmed corners, which gives it an octagonal outline. The step facets run in concentric rectangular layers rather than the radiating facets of a brilliant cut. The result, when you look into a well-cut Asscher, is a hall of mirrors effect with a distinctive X pattern visible at the centre.

The original Asscher cut had 58 facets. The Royal Asscher company trademarked an updated version in 2001 called the Royal Asscher, which has 74 facets and produces more brilliance while keeping the step-cut character. Most Asscher cuts you will find today in the lab-grown market are the original 58-facet version or variations of it.

How it handles light

The Asscher does not try to maximise brilliance the way a round brilliant does. Step cuts reflect light in long, linear flashes rather than the rapid sparkle of brilliant facets. What the Asscher offers instead is a deep, almost three-dimensional transparency. The stone looks like it has layers you could fall into. In dim lighting, it is more understated than a round. In bright direct light, the X pattern at its centre becomes very clear and quite striking.

This also means the Asscher is very honest. Step cuts do not hide inclusions the way brilliant cuts do. An inclusion that would be invisible in a round brilliant can be quite visible in an Asscher because the stone does not scatter light in ways that disrupt your view into it. For this reason, clarity is more important in an Asscher than in most other shapes.

Clarity minimum for Asscher cuts

VS1 is the practical minimum for most buyers. VS2 can work but requires viewing the specific stone, not just trusting the grade, because the location and type of inclusion matters enormously in a step cut. A cloud or feather in the centre of an Asscher is far more visible than the same inclusion in a corner. SI1 is not a safe default in an Asscher the way it can be in a round brilliant.

VVS is the safest choice if budget allows, not because inclusions are visible to the naked eye at VS1, but because the Asscher's transparency means even subtle haziness from clouds affects the stone's visual depth.

Setting considerations

The trimmed corners of the Asscher are a structural advantage. Unlike princess cuts, which have sharp corners vulnerable to chipping, the Asscher's clipped corners are more durable and do not require V-prong protection. Standard four-prong settings work well and are the most common. Bezel settings also work but reduce the visual depth of the stone by obscuring some of its sides.

Asscher cuts sit low and wide relative to their carat weight, which means a 1-carat Asscher has less face-up diameter than a 1-carat round. Buyers coming from brilliant cuts are sometimes surprised by this. At 4 carats, the face-up surface area is substantial enough that this is less of a concern.

Indian market availability

Asscher cuts in lab-grown diamonds are available from several Indian sellers as of 2026, though selection is considerably narrower than round or oval. Price per carat for a 1-carat EF VVS1 Asscher in 14kt gold runs roughly Rs. 1,50,000 to Rs. 2,00,000 from brands with established retail infrastructure. At 4 carats, the range is Rs. 1,50,000 to Rs. 5,00,000 depending on colour, clarity, whether the stone is natural or lab-grown, and the setting metal.

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The kite cut: actually rare and difficult to source well

What it is

A kite cut is a non-traditional fancy shape: a diamond cut to a four-sided kite outline, wider at one end and tapering to a point at both the top and bottom. It is not a standard catalogue cut with defined proportions the way round brilliant or Asscher are. Every kite cut is slightly different in length-to-width ratio, corner angles, and facet arrangement. This is simultaneously what makes it interesting and what makes it difficult to evaluate.

The kite became more widely known after jeweller Baylee Zwart's Instagram posts featuring kite-cut engagement rings reached significant circulation around 2022 and 2023. At that point there were fewer than 10,000 Google search results for kite-cut diamonds. That number has grown considerably since, though it is still a fraction of traffic for standard shapes.

How it handles light

Kite cuts are typically brilliant-cut (the facets radiate from the centre rather than running in steps), but the irregular geometry means light return is uneven compared to a round. The pointed ends are particularly prone to light leakage. A well-cut kite will have a defined bright zone in its body with controlled darkening at the tips. A poorly cut kite will have dark bow-tie-like extinction zones that make the stone look flat.

Because there is no standardised proportions guide for kite cuts, the only reliable way to evaluate one is to watch video of the specific stone under multiple light sources. Static images are even more misleading for kites than for ovals or pears.

Setting considerations

The pointed ends of a kite cut require V-prong protection at both tips, similar to marquise or pear shapes. Most kite cuts are set in a four-prong basket with two V-prongs at the points and two standard prongs on the sides. The setting for a kite cut is more custom than standard shapes, which means setting costs are higher and fewer jewellers will have standard kite mountings in stock.

East-west settings, where the kite is rotated 90 degrees so it lies horizontally across the finger rather than pointing vertically, have become popular because they show more of the stone's face and create a more distinctive look than vertical placement.

Indian market availability

Kite cuts in lab-grown diamonds are available in India but the selection is thin. Expect most kite-cut rings available in India in 2026 to be set in imported mountings or custom-ordered settings. Production times are longer than standard shapes. Prices at 1 carat start around Rs. 70,000 to Rs. 1,20,000 for lab-grown stones in 14kt gold. Kite cuts at 4 carats are available from a small number of sellers at approximately Rs. 1,40,000 to Rs. 2,50,000 depending on quality and setting.

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The hexagon cut: geometric by intention

What it is

A hexagon-cut diamond has a six-sided outline. It is not a single standardised cut but a shape category that can be faceted as a brilliant, a step cut, or a combination. The proportions that matter most are the length-to-width ratio (whether the hexagon is regular or elongated) and the depth percentage (which determines face-up size vs carat weight).

Hexagon cuts became visible in the editorial jewellery market around 2020 to 2022 as alternatives to the more common round or oval solitaire. The appeal is geometric by design: a hexagon reads as intentional and modern in a way that rounded shapes do not.

How it handles light

A brilliant-cut hexagon produces reasonable sparkle but the six-sided outline creates dead zones at the corners that do not exist in round or oval shapes. A step-cut hexagon is more transparent and hall-of-mirrors in character, similar to an emerald or Asscher but with a more contemporary silhouette.

The corner behaviour is the primary optical challenge. Hexagons with sharp, unmodified corners can show significant darkening at the six points. Some cutters soften these with additional facets at the corners; others leave them as defined geometric points. Both approaches are valid aesthetically but produce different looks.

Setting considerations

Hexagons are typically set with six prongs, one at each corner. The pointed corners on a hexagon are not as acute as those on a marquise or kite and are therefore less vulnerable to chipping, though V-prong coverage is still recommended if the corners are sharp rather than slightly bevelled.

Hexagon cuts work well in east-west orientations and in geometric cluster settings. Bezel settings are popular for hexagons because the bezel reinforces the geometric shape while protecting the corners.

Indian market availability

Lab-grown hexagon cuts are available from a handful of Indian and international sellers shipping to India. At 4 carats, expect prices between Rs. 2,50,000 and Rs. 4,50,000 for lab-grown stones in gold settings. Selection at this carat weight is narrow. Most available inventory in India is in the 1 to 2 carat range.

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The moval cut: the oval-marquise hybrid that does both shapes better than either alone

What it is

Moval is a portmanteau of marquise and oval. It describes a diamond with an elongated oval outline that has slightly more pointed ends than a standard oval but is not as extreme as a marquise. The result sits visually between the two shapes: more finger-elongating than a round oval, less dramatic than a full marquise.

There is no single standardised moval proportion. The term is used loosely by cutters and sellers to describe elongated ovals with length-to-width ratios typically between 1.6 and 2.0, where a standard oval is usually 1.3 to 1.5 and a marquise is 1.8 to 2.2 or higher. This means what one seller calls a moval, another might list as an elongated oval or a soft marquise.

How it handles light

The moval is brilliant-cut and handles light similarly to an oval, with the same bow-tie concern. Because the ends are more pointed than a standard oval, the bow-tie on a moval can be more pronounced if the stone is not cut carefully. The elongated shape also shows colour more clearly than a rounder stone, so going one colour grade higher than you might for a round is advisable.

The payoff is visual size. A moval shows significantly more face-up surface area per carat than a round and somewhat more than a standard oval. At 4 carats, this means the stone reads very large on the finger without the bluntness of a round or cushion at that weight.

Setting considerations

Movals typically use a two-prong-at-each-end, two-prong-on-each-side arrangement, similar to ovals. Because the ends are more pointed than a standard oval, some cutters recommend V-prong coverage at the tips. East-west settings are common and show the elongated shape to full effect.

Indian market availability

Moval cuts in lab-grown diamonds are available in India though terminology is inconsistent. Searching for 'elongated oval' or 'moval' may return overlapping results. At 4 carats, prices from Indian sellers run approximately Rs. 2,00,000 to Rs. 3,50,000 for lab-grown stones in gold settings, depending on quality grades and setting metal.

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The marquise cut: long, pointed, very much back in conversation

What it is

The marquise cut has a long, boat-shaped outline with two pointed ends. It dates to 18th-century France and takes its name from the Marquise de Pompadour. It was the dominant fancy shape in certain decades of the 20th century, fell out of fashion for a long period, and has been returning steadily since around 2022, accelerated in part by Selena Gomez's engagement ring in 2024, which brought significant editorial attention to the shape.

Standard marquise proportions have a length-to-width ratio between 1.75 and 2.25. Stones outside that range read either too stubby (below 1.75) or too needle-like (above 2.25) for most wearers, though preferences vary.

How it handles light

The marquise is a brilliant cut and produces good sparkle when cut well. The primary optical challenge is the bow-tie: the pointed ends cannot return light the way the belly of the stone can, creating a dark zone across the centre that looks like a bow tie from above. Every marquise has some degree of bow-tie. The question, as with ovals, is how pronounced it is.

The pointed ends are the other optical concern. Where the points are, the stone thins to almost nothing, meaning light leaks heavily at the tips. This is normal and expected in a marquise, but some cutting approaches manage it better than others by adding extra facets near the tips.

The marquise has one genuine optical advantage: it has the largest face-up surface area per carat of any brilliant cut. A 1-carat marquise shows more face than a 1-carat oval, which shows more than a 1-carat round. At 4 carats, a well-proportioned marquise is a a real presence on the finger.

Setting considerations

The pointed ends of a marquise are the most fragile feature of the stone and require V-prong protection. A marquise with open, unprotected tips is a chipping risk in daily wear. Always confirm V-prongs at both ends before purchasing, regardless of what the product photography suggests.

East-west settings are common and give the marquise a broader, more horizontal appearance across the finger. North-south settings (the traditional orientation, with the points toward and away from the hand) emphasise the finger-elongating effect of the shape.

The marquise shows colour more readily than round or oval. If buying in a white metal setting, staying at G or higher is advisable. In yellow gold, H or even I can look beautiful.

Indian market availability

Lab-grown marquise cuts are available in India with reasonable selection compared to kite or hexagon. At 4 carats, prices from Indian sellers range from roughly Rs. 80,000 for lower-tier options to Rs. 4,50,000 or higher for EF VVS lab-grown stones in gold settings. The wide range reflects significant variation in lab-grown vs natural stone, clarity grade, and brand positioning.

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The old mine cut: before modern precision existed

What it is

The old mine cut was the dominant diamond cutting style from roughly the 1700s to the late 1800s, before modern cutting tools made precise round brilliants possible. Old mine cuts are square-ish in outline with rounded corners, a small table, a very high crown, a large culet (the flat or pointed bottom facet), and a deep pavilion. They have 58 facets arranged in a pattern that predates the mathematical optimisation of modern brilliant cuts.

They look different from modern cuts because they were designed to perform under candlelight rather than electric light. They produce large, slow flashes of light rather than the rapid sparkle of a modern round. The culet, which in modern diamonds is either absent or tiny, creates a small circle visible at the centre of an old mine cut when viewed from above. This is not a flaw. It is a structural characteristic of the period.

Old mine cuts have been experiencing a significant revival. Taylor Swift's engagement ring drew major editorial attention to antique and old mine cuts in 2023. The appeal is partly aesthetic (the warm, romantic light quality), partly the association with vintage jewellery and estate pieces, and partly the growing collector interest in non-optimised cuts as a form of character.

Old mine vs old European cut

These two terms are often confused. The old mine cut is square-ish and predates the old European. The old European cut, which developed in the late 1800s, is rounder and is the direct predecessor of the modern round brilliant. Both have high crowns, large culets, and small tables. The key visual difference is outline: old mine is squarish, old European is circular.

In the lab-grown market, both are reproduced using modern cutting equipment aimed at replicating the proportions of historical stones. They are not antique diamonds. They are new diamonds cut to old proportions. This is worth understanding before buying.

How it handles light

Old mine cuts are not optimised for the overhead lighting conditions of most indoor environments. They perform best in candlelight or warm directional light, where the large crown facets catch and return light in broad, warm flashes. Under fluorescent or cool overhead lighting, they look less brilliant than a modern round cut at equivalent grade.

This is a known tradeoff, not a defect. Buyers choosing old mine cuts are typically choosing them because of how they look in low warm light, not because they maximise sparkle under LED. Going in with that expectation makes the purchase decision considerably easier.

Setting considerations

Old mine cuts pair naturally with antique-style settings: milgrain edges, filigree, Victorian or Edwardian-inspired prong arrangements, and yellow or rose gold metals. Modern minimalist settings can work but can create a visual mismatch between the stone's character and the setting's aesthetic.

Because old mine cuts have a high crown, the stone sits noticeably elevated above the finger. This is part of the vintage look but can increase daily snagging more than a modern low-profile setting.

Indian market availability

Lab-grown old mine cuts are available in India but selection is limited. Golden Bird Jewels has appeared in search results for this style. Prices for lab-grown old mine cuts in 4-carat equivalent weights are approximately Rs. 1,50,000 to Rs. 3,50,000 for lab-grown stones, considerably less than genuine antique old mine diamonds of equivalent size, which can run several times higher.

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The Portuguese cut: the high-facet specialist

What it is

The Portuguese cut is a faceting style, not a shape. The stone can be round, oval, or cushion in outline, but the faceting is what makes it distinct. A standard round brilliant has 57 or 58 facets. A Portuguese cut has 160 or more, arranged in a complex multi-row pattern that adds additional facet tiers to both the crown and pavilion beyond what any standard brilliant carries.

The cut originated in Portugal and has been used on natural diamonds for centuries in high-end antique and estate pieces. In the lab-grown diamond market, it remains rare because cutting 160-plus facets on a single stone takes considerably longer than a standard brilliant, and the added labour has to be justified by the visual result. Most manufacturers default to standard brilliant cuts because they are faster and the demand is predictable.

How it handles light

The higher facet count changes the character of the stone's light return. A standard round brilliant produces a defined, rapid sparkle pattern that most people recognise as diamond brilliance. A Portuguese cut produces a more complex, layered scintillation: more individual flashes, more visible fire (the coloured dispersion that appears as rainbow flickers), and a pattern that looks different from different angles. The stone does not go dark between flashes the way a brilliant can under certain lighting. Instead it maintains a kind of constant low-level complexity alongside the main sparkle.

The trade-off is that the additional facets do not all contribute equally to brightness. In some lighting conditions, a Portuguese cut can look busier or more scattered than a well-cut standard brilliant, where the cleaner facet arrangement produces a more defined and crisp scintillation. Which effect you prefer is personal. They are different, not better or worse.

Setting considerations

Because the Portuguese cut is defined by its faceting and not its outline, setting considerations depend on the shape of the specific stone. A round Portuguese cut follows the same setting logic as any round: four or six prongs, standard basket, low or high profile based on preference. The cut itself does not change the structural requirements of the setting.

Where the Portuguese cut does interact with settings is visually. The complex facet pattern benefits from settings that allow maximum light entry from the side, so open four-prong heads and thin bands tend to let the stone perform better than bezel settings that block side light.

Clarity and colour considerations

The additional facets in a Portuguese cut create more internal visual activity, which can make inclusions harder to spot than in a step cut but more apparent than in a standard brilliant because there are more surfaces interacting with light. VS2 is a reasonable minimum. The high fire and complex scintillation do mask slight colour quite well, so G or H colour typically reads fine in a Portuguese cut round or oval.

Indian market availability

Portuguese cuts in lab-grown diamonds are available in India but selection is very thin. It is a specialty cut and most Indian brands do not carry it as a standard offering. At 4 carats, a Portuguese-cut lab-grown diamond in gold is available from a small number of sellers and runs approximately Rs. 3,00,000 to Rs. 3,50,000 for EF VVS quality in 18kt gold, based on market data from early 2026. Custom orders from brands that do offer this cut may have longer lead times than standard shapes.

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How to compare rare cuts before buying

Buying any rare cut requires more due diligence than buying a round brilliant, because the grading standards that give you confidence in a round do not translate cleanly to most fancy or non-traditional shapes.

Here is what to do regardless of which rare cut you are considering.

Request video, not just photos. Static product photography for rare cuts is almost always misleading. The stone should be rotating under at least two different light sources, one bright and directional, one diffuse. If a seller cannot or will not provide video of the specific stone you are buying, that is a serious gap in the buying experience.

Understand what IGI does and does not grade for fancy shapes. IGI assigns Excellent, Very Good, and lower cut grades for round brilliants. For all fancy shapes, including every shape discussed in this guide, IGI grades symmetry and polish separately but does not assign an overall cut grade. The absence of an overall cut grade is normal for these shapes. What you are evaluating instead is whether the symmetry grade is Excellent, whether the polish is Excellent or Very Good, and then the actual appearance of the stone in video.

Match clarity to shape. Step cuts (Asscher, hexagon in step-cut form) need higher clarity than brilliant cuts. VS1 minimum for step cuts; VS2 minimum for brilliant fancy shapes with review of the specific stone.

Ask about setting lead times. Rare cut settings are not always in stock. A kite, hexagon, or moval typically requires a custom or semi-custom mounting. Lead times can be three to six weeks or longer. Confirm this before completing a purchase if timeline matters.

Verify the certificate. Every IGI certificate has a report number laser-inscribed on the girdle and verifiable at igi.org. Do this for every stone, but especially for rare cuts where the premium for a specific shape or history of the cut can tempt misrepresentation.

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Rare cut comparison: at a glance

Cut	Facet style	Best light	Clarity minimum	Finger effect	Chipping risk	Indian lab-grown availability
Asscher	Step cut	Ambient, directional	VS1	Widens	Low (clipped corners)	Moderate
Kite	Brilliant	Directional	VS2 with video	Varies by orientation	High (pointed tips)	Thin
Hexagon	Brilliant or step	Both	VS1 for step, VS2 for brilliant	Neutral	Moderate (corners)	Thin
Moval	Brilliant	Any	VS2 with video	Strong elongating	Moderate (pointed ends)	Moderate
Marquise	Brilliant	Any	VS2 with video	Strong elongating	High (sharp tips)	Moderate
Old mine	Antique brilliant	Warm, candlelight	VS2 minimum	Slight widening	Low (rounded outline)	Thin
Portuguese	Multi-row brilliant (160+ facets)	Any	VS2	Shape-dependent	Shape-dependent	Thin

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What 'premium' actually means at 4 carats

The query that drives a lot of searches for these cuts is specifically framed around 4-carat stones with rare cuts. This framing matters because 4 carats is a different category from 1-carat shopping.

At 1 carat, the Indian lab-grown market has genuine depth. There are dozens of IGI-certified options across shapes, quality tiers, and metals. At 4 carats, the market thins considerably. Most of what appears in search results at the 4-carat level for rare cuts is either natural diamond (with prices that are orders of magnitude higher), international sellers shipping at import-inflated prices, or lab-grown stones where the per-carat price has not scaled linearly.

A 4-carat lab-grown Asscher EF VVS in 14kt gold will run Rs. 2,00,000 to Rs. 5,00,000 in India from sellers with established reputations. A 4-carat kite or hexagon lab-grown stone may require a longer search and custom setting work that pushes the total cost higher.

One thing worth knowing: at 4 carats in a rare cut, the face-up size is large enough that the specific shape's efficiency per carat becomes secondary to how the stone wears on the actual finger. A 4-carat moval or marquise at typical proportions will be quite dramatic in a way that makes the buyer's hand and lifestyle more relevant than at 1 or 2 carats. Whether a 4-carat stone is 'too big' is entirely personal, but understanding what these shapes look like at that weight in real-world wear, not just in product photography, is worth finding through community forums and real-buyer photos before committing.

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Frequently Asked Questions

Is 4 carats too big for everyday wear?

This is a real concern and one that forums discuss more candidly than retailer content tends to. 4 carats in a round brilliant has a face-up diameter of roughly 10.2 mm, which is larger than many people expect before they see it in person. In an elongated shape like marquise or moval, the stone is even longer across the finger. For some people and some lifestyles, this is exactly the look they want. For others, it is more stone than works practically for typing, manual work, or gym use.

What helps: find community posts and real-buyer photos of 4-carat stones in the specific shape you are considering on hands similar to yours. Product photography is shot on professional models with specific lighting to maximise the stone's drama. Real-wear photos on forums give a more honest picture of daily proportions.

Why are some of these cuts not on any Indian brand's website?

The Indian lab-grown retail market has grown fast but the shape inventory has not kept pace with the cutting possibilities. Brands stock what sells. Round, oval, cushion, and pear move consistently. Kite cuts, old mine reproductions, and hexagons have much thinner demand and require custom-order infrastructure that smaller brands do not maintain. The shapes that do appear on Indian sites are often imported settings or semi-custom orders, which is why lead times are longer and selection is narrower.

Does an IGI certificate mean anything different for a kite or hexagon versus a round?

The certificate covers the same parameters: carat weight, colour grade, clarity grade, measurements, fluorescence, and in the case of these shapes, symmetry and polish. What it does not cover is an overall cut grade, because IGI does not grade overall cut for fancy shapes. The certificate is still worth having and verifying. It just cannot do the work that video review does for evaluating how a kite or hexagon actually behaves with light.

Can a rare cut lab-grown diamond be re-sold or exchanged?

Resale and exchange policies vary by brand, and this is worth clarifying before purchasing any premium stone. For rare cuts specifically, the pool of buyers for a pre-owned 4-carat kite-cut lab-grown ring is meaningfully smaller than for a round brilliant. This is not a reason to avoid rare cuts if the stone is right for you. It is a reason to treat rare cut purchases as personal jewellery decisions rather than investments with predictable liquidation paths.

This guide was researched and written in May 2026. It is an educational reference only and does not constitute purchasing advice. Verify all specifications directly with sellers before completing any purchase.