The shape of the centre diamond is the most immediately visible characteristic of an engagement ring — it defines the overall look more than any other single factor. Shape is also one of the most personal choices, with strong preferences that are often deeply intuitive.
It is worth noting the distinction between shape and cut. Shape refers to the outline of the diamond — round, oval, pear, and so on. Cut refers to the quality of the faceting within that shape — how precisely the angles and proportions have been executed. Both matter, but shape is the starting point.
Round Brilliant
The round brilliant is the most popular diamond shape in the world, accounting for more than half of all diamonds sold. Its 57 or 58 facets are mathematically optimised to maximise light return — no other shape produces as much brilliance, fire, and scintillation.
The round brilliant suits every ring style and metal, and works on every hand shape. It is the benchmark against which all other shapes are measured. If you are undecided or buying for someone with unknown preferences, round brilliant is the safest and most universally loved choice.
One practical note: round brilliants are the most expensive shape per carat because of the amount of rough diamond lost during cutting. Other shapes, particularly elongated ones, offer more visible surface area per carat.
Oval
The oval has been the fastest-growing diamond shape over the past decade and is currently at the height of its popularity. It combines the brilliance of a round brilliant with an elongated outline that creates a flattering effect on the finger — oval diamonds appear larger than round diamonds of the same carat weight, and the elongated shape makes fingers look longer and more slender.
Oval diamonds can display a phenomenon known as the bow-tie effect — a dark shadow across the centre of the stone that resembles a bow tie. The severity varies between stones and is best assessed in person or via video. Stones with a minimal bow-tie are preferred.
Best for: those who want maximum face-up size, a modern but not trend-driven look, and a flattering effect on the hand.
Emerald Cut
The emerald cut is a rectangular step-cut diamond with cropped corners. Rather than the brilliant faceting used in round and oval diamonds, the emerald cut uses long, parallel facets arranged in steps — creating a distinctive hall-of-mirrors effect and a more architectural, less sparkly appearance.
The emerald cut is associated with vintage glamour, sophistication, and confidence. It is less forgiving than brilliant cuts — inclusions and colour are more visible in a step cut — so clarity and colour grades matter more. We recommend VS2 or better, and D–H colour for emerald cuts in white metal settings.
Best for: those drawn to a bold, architectural look with vintage associations. Particularly striking in a solitaire or east-west setting.
Pear
The pear shape — also called a teardrop — combines the rounded end of an oval with a pointed tip, creating an asymmetric silhouette that is both romantic and distinctive. Pear diamonds are worn with the point facing toward the fingertip, which creates an elongating effect on the finger.
Pear shapes can vary significantly in their length-to-width ratio. A longer, more slender pear has a dramatic, elegant quality. A shorter, rounder pear is softer and more approachable. The ideal ratio is a matter of personal preference — typically between 1.45:1 and 1.75:1.
Like ovals, pear diamonds can display a bow-tie effect, which should be assessed per stone.
Best for: those who want a distinctive, romantic shape with strong visual presence. Particularly effective in a halo or pavé setting.
Cushion Cut
The cushion cut is a square or rectangular diamond with rounded corners and large facets that give it a soft, pillow-like appearance. It is one of the oldest diamond shapes and has been associated with fine jewellery for centuries.
Modern cushion cuts come in two main variations: the classic cushion, with a chunkier facet pattern that produces strong flashes of colour (fire), and the cushion brilliant, which has a more modern facet arrangement that produces more white light return (brilliance). Both are beautiful — the difference is best seen in person.
Best for: those who want a romantic, vintage-inflected look with a soft outline. Very popular in halo settings.
Princess Cut
The princess cut is a square diamond with pointed corners and a brilliant facet arrangement that produces significant sparkle. It is the most popular non-round diamond shape and is particularly associated with contemporary and modern ring designs.
Princess cuts are efficient in terms of rough diamond usage — they retain more of the original rough crystal than round cuts, which is why they can sometimes offer slightly better value per carat. The pointed corners are the most vulnerable part of the stone and benefit from corner prongs or a bezel setting that provides protection.
Best for: those who want a modern, geometric look with strong brilliance.
Marquise
The marquise is an elongated shape with pointed ends at both tips — an eye-shaped outline that dates to 18th century France. It is one of the most distinctive diamond shapes and creates one of the most dramatic elongating effects on the finger of any shape.
Marquise diamonds typically appear larger than other shapes of equivalent carat weight because their elongated form spreads surface area across the finger. They are worn with the points aligned toward the knuckle and fingertip.
The bow-tie effect is particularly pronounced in marquise diamonds — stone selection is important and we recommend viewing each stone carefully before purchasing.
Best for: those who want a bold, distinctive, fashion-forward choice with strong visual impact.
There is no objectively best diamond shape — only the right one for the person who will wear it. The choice you make should feel instinctive, not calculated.
JQ Diamonds, In-House Specialists
Ready to Search by Shape?
Our diamond feed lets you filter by shape, cut, colour, clarity, and carat across thousands of certified stones.
Which Shape Is Right for Your Partner?
If you know your partner's jewellery preferences, that is the most reliable guide. Someone drawn to minimal, architectural jewellery will often love an emerald cut. Someone who loves romantic, feminine pieces is likely drawn to oval, pear, or cushion. Someone who wants the most brilliant, classic option will most likely be happiest with a round brilliant.
If you have no strong signals to go on, round brilliant remains the safest choice — loved by the broadest range of people and never subject to changing trends. Oval is a strong second choice with a more contemporary feel.
Our specialists see hundreds of couples choosing diamonds each year and are usually able to identify the right direction quickly. If you would like a second opinion before committing, come and see us.
