There are eight common diamond shapes for engagement rings: round brilliant (most popular, maximum sparkle), oval brilliant (looks up to 10% larger than a round), cushion cut (vintage romantic look), emerald cut (clean rectangular step cut), pear shape (asymmetric teardrop), marquise (longest-looking shape per carat), princess cut (modern square), and asscher (square emerald cut). Round brilliants are the most expensive; emerald and asscher cuts are typically 30% cheaper for the same carat weight, colour and clarity.
- A round brilliant has 57 or 58 facets — mathematically optimised for maximum light return.
- Oval brilliants appear up to 10% larger on the finger than rounds of equivalent carat weight.
- Emerald cuts are 'step cuts' with parallel facets that produce flashes rather than continuous sparkle.
- Round brilliants typically cost 25–30% more per carat than ovals and 30–35% more than emerald cuts (equivalent grade).
- Marquise and pear shapes have one or two vulnerable points that require protective claw settings.
"Shape" is one of the first decisions a couple makes when starting an engagement ring search — and it's one of the most personal. Below is the practical UK buyer's guide to the eight diamond shapes you'll actually see on engagement rings, what each one looks like on the finger, the typical price difference between them, and which finger shapes each one flatters.
1. Round Brilliant — the all-time bestseller
The round brilliant is the most popular diamond shape worldwide, and the only shape that has been mathematically optimised for maximum light return. A well-cut round brilliant has 57 or 58 facets arranged in a precise geometry that returns more sparkle to the eye than any other shape.
Looks like: A circle with 57 facets, returning light as continuous, sparkling fire from every angle.
Approximate face-up size: 1.00ct ≈ 6.5mm across.
Premium vs other shapes: Most expensive shape per carat — typically 25–30% more than an oval of the same weight, because more rough diamond is lost in cutting.
Best for: Anyone who wants maximum sparkle. Suits every finger shape. The safest "won't-go-wrong" choice.
Pair with: Solitaire, halo, side-stone — every setting works.
2. Oval Brilliant — the carat-stretcher
An oval brilliant is essentially a round brilliant stretched along one axis. The cut returns nearly as much light as a round, but the elongated outline makes the stone look up to 10% larger than a round of the same carat weight.
Looks like: A long oval with continuous sparkle. The optimal length-to-width ratio is 1.35–1.50.
Approximate face-up size: 1.00ct oval ≈ 8mm × 6mm.
Premium: Typically 20–25% cheaper than a round of the same weight, and looks bigger. The smart choice for budget-aware buyers.
Watch out for: The "bow-tie" — a dark shadow across the middle of poorly-cut ovals. Always inspect any oval in person or via video before buying.
Best for: People who want maximum visual size for the budget, longer fingers (the elongation flatters), and anyone who finds rounds "too common".
Pair with: Solitaire, oval halo, halo with shoulders, or oval-round-oval trilogy.
3. Cushion Cut — vintage warmth
A cushion cut is a square or rectangle with rounded corners — like a pillow seen from above. It's been popular since the 1700s (when it was called "old mine cut") and has a softer, more romantic light pattern than a round brilliant.
Looks like: A pillow-shaped diamond with chunky, flashing facets rather than continuous sparkle.
Approximate face-up size: Slightly smaller-looking than a round of the same carat weight because the depth tends to be greater.
Premium: Typically 10–15% cheaper than a round.
Variations: "Cushion brilliant" (modern, more sparkle) and "cushion modified" (more facets, more fire). "Antique cushion" cuts emphasise larger facets and a more vintage look.
Best for: Anyone with vintage taste, partners who like Tiffany-style "old world" jewellery, or anyone whose engagement ring is meant to feel heirloom rather than contemporary.
Pair with: Solitaire, halo (cushion halos are particularly popular), or vintage-inspired settings with milgrain detail.
4. Emerald Cut — clean, architectural, confident
An emerald cut is a rectangular "step cut" — the facets are arranged in long parallel lines rather than the brilliant-cut star pattern. It produces dramatic flashes of light rather than continuous sparkle, and shows clarity more honestly than any other shape.
Looks like: A rectangular diamond with crisp parallel lines and "hall of mirrors" flashes.
Premium: Typically 30% cheaper than a round of the same weight.
Critical caveat on clarity: The large open table of an emerald cut makes inclusions much more visible. Always buy VS1 or higher on emerald cuts — never SI grades. Colour can be slightly lower (G–H is fine) because the cut hides colour better than it hides inclusions.
Best for: Anyone with art-deco or minimalist taste. Long fingers (the rectangular shape elongates visually). Couples who prefer subtlety to maximum sparkle.
Pair with: Solitaire (the most elegant choice), shoulder-set rings, or simple bezel settings — see our Collet emerald-cut shoulder-set ring.
5. Pear Shape — romantic and elongating
A pear (or "teardrop") is asymmetric — round at one end, pointed at the other. Worn point-toward-the-fingertip (the traditional orientation), it elongates the finger visually and gives a romantic, slightly old-world look.
Looks like: A teardrop with a soft, brilliant facet pattern.
Premium: Typically 15–20% cheaper than a round.
Pros: Distinctive without being unconventional. Elongates the finger. Works beautifully in trilogies.
Cons: The point is the most vulnerable part of any diamond — always set in a protective claw at the tip. Some buyers find the asymmetry off-putting on rings (it's more common on earrings and pendants).
Best for: People who like asymmetric design, anyone with shorter fingers who wants visual elongation.
Pair with: Solitaire (with a protective claw at the point), pear-round-pear trilogy, or as a centre stone in a halo.
6. Marquise — maximum face-up size
A marquise is a stretched oval with pointed ends — also called a "navette" cut. It has one of the largest face-up appearances per carat weight of any shape: a 1.00ct marquise can look closer to 1.20–1.30ct round.
Looks like: A long, narrow, almond-shaped diamond with pointed ends and brilliant facets.
Premium: Typically 15–25% cheaper than a round.
Pros: Maximum visual size on the finger. Distinctive vintage look.
Cons: Two vulnerable points (one at each end) require protective settings. The "bow-tie" effect can be more pronounced than on ovals — always inspect cut quality carefully. Some people find marquise rings divisive.
Best for: Vintage taste, smaller hand sizes where face-up area matters, and anyone who wants their stone to look 30% bigger than it is.
Pair with: Solitaire with protective claws at both points, marquise-round-marquise trilogy.
7. Princess Cut — the modern square
A princess cut is a square (or near-square) brilliant cut. It was invented in the 1960s and became hugely popular in the 1980s and 1990s. It has more sparkle than emerald or asscher cuts but a sharper, more modern outline than cushion.
Looks like: A square with brilliant-cut facets — sharper corners than cushion, more sparkle than emerald.
Premium: Typically 25–30% cheaper than a round.
Cons: The four sharp corners are vulnerable to chipping — always set in protective V-claws. Princess cuts tend to show colour more than rounds (consider G–H rather than I–J).
Best for: Anyone who wants a modern, geometric look. People who prefer right angles to circles. Generally less popular in 2026 than it was 15 years ago, but undergoing a small revival.
Pair with: Solitaire with V-claws at each corner. Looks dated in halos to most modern eyes.
8. Asscher Cut — square step cut
An asscher is essentially a square emerald cut — a step-cut diamond with clipped corners, giving it an octagonal outline. Like emerald cuts, it produces flashes rather than continuous sparkle.
Looks like: A square diamond with "hall of mirrors" flashes and visible step facets.
Premium: Similar to emerald cuts — typically 25–30% cheaper than rounds.
Clarity caveat: Same as emerald cut — buy VS1 minimum, never lower.
Best for: Strong art-deco taste, anyone who likes the emerald look but prefers a square outline.
Pair with: Solitaire (always the most elegant choice with step cuts), or trilogy with asscher-round-asscher.
How shape affects price (rough rule of thumb)
For the same carat weight, colour and clarity, prices typically scale roughly:
| Shape | Approximate price vs round brilliant |
|---|---|
| Round brilliant | 100% (baseline — most expensive) |
| Princess cut | 70–75% |
| Cushion cut | 80–85% |
| Oval brilliant | 75–80% |
| Pear shape | 75–80% |
| Marquise | 75–80% |
| Emerald cut | 65–70% |
| Asscher cut | 65–70% |
So a £5,000 round brilliant solitaire could become a £3,500 emerald cut solitaire at the same colour, clarity, and carat weight. That's a meaningful saving if shape preference is flexible.
Which shape suits which finger
| Finger type | Best-matching shapes |
|---|---|
| Long, slim fingers | Round, cushion, asscher (anything looks good) |
| Short fingers | Oval, pear, marquise (elongation flatters) |
| Wide fingers | Cushion, princess, emerald (proportional width) |
| Narrow / very small fingers | Round, cushion (avoid very long shapes) |
These are guidelines, not rules — the best way to settle the question is to try multiple shapes on your partner's finger.
What we'd recommend trying first
When clients arrive in our Leicester or London showroom undecided on shape, we typically lay out a round, an oval, a cushion and an emerald cut at the same carat weight on a black tray and let them compare. It almost always settles the decision in five minutes. Book a free consultation if you'd like to do the same.
Further reading
- The 4Cs of Diamonds Explained — cut, colour, clarity, carat.
- Engagement Ring Styles Explained — solitaire, halo, trilogy, side-stone.
- What GIA & IGI Certification Means
Frequently asked questions
Which diamond shape is the most popular?
Round brilliant is the most popular diamond shape worldwide. It is also the most expensive per carat because more rough diamond is lost in cutting and because it returns the most light of any cut.
Which diamond shape looks the largest on the finger?
Marquise looks the largest per carat — a 1.00ct marquise can read closer to 1.20ct on the finger. Oval and pear shapes are the next-largest-looking. Round and cushion cuts have smaller face-up area for the same carat weight.
What's the cheapest diamond shape?
Emerald cut and asscher cut are typically the cheapest per carat — around 30–35% less than a round brilliant of the same carat weight, colour and clarity. The trade-off is they produce dramatic flashes rather than continuous sparkle.
Are oval diamonds better value than round?
Yes, oval brilliants are typically 20–25% cheaper than round brilliants of the same weight, AND they look up to 10% larger on the finger due to the elongated outline. They are an excellent value choice for buyers focused on visual size.
What's a bow-tie in an oval diamond?
A bow-tie is a dark shadow visible across the centre of a poorly-cut oval, pear or marquise diamond — it looks like a bow-tie. It is caused by faceting misalignment. Always inspect any oval, pear or marquise stone in person or via video before buying to confirm it has minimal bow-tie.