Radiant Cut Diamond
By Jared James · Last updated 21 May 2026
Quick answer
A radiant cut diamond pairs a square or rectangular outline with cropped corners and brilliant-style facets. It gives more sparkle than an emerald cut and has softer corners than a princess cut, so it suits anyone who wants geometry without giving up brightness. The first thing to decide is whether you want a square radiant at a ratio close to 1.00 or an elongated one at 1.15 to 1.35, and from there you can check the centre brightness and the facet pattern.
Shape at a glance
| Detail | Typical detail | Buying note |
|---|---|---|
| Facet pattern | Brilliant-style faceting with cropped corners. | The cropped corners make a radiant much less vulnerable than a sharp-cornered princess cut. |
| Typical ratio | Around 1.00 to 1.05 for square radiants and 1.15 to 1.35 for rectangular radiants. | Decide on square or rectangular first, because the feel of the ring changes a lot between the two. |
| Sparkle | Bright and active, sometimes with a crushed ice texture. | Look for even brightness right across the stone, from the centre out to the corners. |
| Best for | Solitaire rings, halos, three-stone rings and buyers who like geometric sparkle. | Choose radiant when an emerald cut feels too quiet and a princess cut feels too sharp. |
What is a Radiant Cut Diamond?
A radiant cut diamond has a square or rectangular outline with clipped corners and brilliant-style facets. In feeling it sits right between an emerald cut and a princess cut, structured and geometric but still lively and bright.
Radiants vary quite a bit in their facet pattern. Some show a crisp, even sparkle, while others show a softer crushed ice texture, and because that difference is purely visual, video and real images of the exact stone matter.
What to check before choosing
Square or elongated radiant cut?
A square radiant sits around a 1.00 to 1.05 ratio and reads compact and modern, not far off a princess cut. An elongated radiant at 1.15 to 1.35 reads longer on the finger and feels closer to an emerald cut silhouette, just with a lot more sparkle.
Avoid a dark centre in a radiant diamond
Some radiant cuts have a dark or flat-looking centre, because the facets do not return light evenly across the stone. A good radiant feels bright across the whole face, so compare videos and real-life images rather than relying on the certificate alone.
Best clarity and colour for a radiant cut diamond
The brilliant-style facets hide small inclusions and body colour better than an emerald cut does, so VS2 clarity and H colour or better is a comfortable starting point for most buyers. The exact stone still matters, so inspect it for any visible inclusions before you buy.
Settings that suit this shape
- A solitaire highlights the outline and the sparkle without anything extra getting in the way.
- A halo adds size and strengthens the geometric frame around the stone.
- Three-stone rings with trapezoid, half-moon or tapered side stones help the centre stone feel balanced and intentional.
Who does radiant cut suit?
Radiant cut suits anyone who wants a diamond with clean geometry and strong sparkle. It is a comfortable middle ground between emerald cut structure and the brilliance of a cushion or an oval.
Watch for
- Some radiants can look dark or flat through the centre, so check brightness carefully.
- Crushed ice texture is a personal taste, so compare videos before you choose.
- A very square radiant and a very rectangular one suit quite different settings, so settle the ratio early.
Watch: a radiant cut diamond up close
A close look at how a radiant cut diamond catches and scatters the light.
Other diamond shapes
- #01
Round
If you want the most sparkle and the easiest stones to compare, the round brilliant is the shape to reach for. It is also the only common diamond shape that comes with a proper cut grade, so settle on cut quality first and then choose colour and clarity grades that still look clean and bright once the stone is set.
- #02
Oval
An oval diamond gives you a larger, more lengthening look than a round diamond of a similar weight, and it keeps the bright sparkle pattern of a brilliant cut. There is no single cut grade that tells you whether an oval is a good one, so the things to look at are the bow tie, the length-to-width ratio, the shape of the shoulders and how evenly the two ends mirror each other.
- #03
Emerald Cut
An emerald cut diamond is a step cut, which means it has long, open facets and neatly clipped corners, and it gives you a rectangular outline with broad flashes of light rather than the fast glitter of a brilliant cut. Clarity, colour and ratio all show up more clearly here than in other shapes, so most buyers start at VS1 or VS2 clarity, G colour or better, and a length-to-width ratio somewhere between 1.40 and 1.55 for a balanced, classic look.
- #04
Cushion Cut
A cushion cut diamond has a square or rectangular outline with soft, rounded corners, and depending on the facet pattern it can look antique, modern, chunky or crushed ice. Many buyers find themselves choosing between a true square cushion at a ratio close to 1.00 and an elongated cushion somewhere around 1.15 to 1.30, so it helps to decide the sparkle style and the outline you want first, then compare colour, depth and setting from there.
- #05
Marquise
A marquise diamond is a long brilliant-cut shape with two gently pointed tips, and it gives you one of the largest face-up looks you can get for the carat weight, so it always makes a statement. The trade-off is that it needs excellent symmetry, a bow tie you can live with and tips that are properly protected, so choose it when you want length, drama and presence.
- #06
Pear
A pear shaped diamond, sometimes called a teardrop diamond, has one rounded end and one gently pointed tip. The things worth checking are the length-to-width ratio, which most buyers like somewhere between 1.50 and 1.70, the point alignment, the bow tie effect through the centre, and the prongs that keep the tip protected. Choose pear if you want an elongated shape with a little more softness than a marquise.
- #07
Princess Cut
A princess cut diamond is a square brilliant cut with sharp, uncut corners and plenty of sparkle. It is often called a square diamond, and it is a popular modern alternative to a round brilliant that usually costs a little less per carat. The one practical catch is that the sharp corners need protecting from chips, so look for V-prongs or a bezel, and keep an eye on face-up size, symmetry and colour near the edges.
- #08
Asscher
An asscher cut diamond is a square step cut with cropped corners and long, parallel facets that draw the eye down into the stone, giving the deep, concentric hall of mirrors look the shape is known for. It is essentially a square version of the emerald cut, so the same things matter most: clarity sits on show through the open facets, body colour can be visible, and you want a ratio close to square at around 1.00 to 1.05.
- #09
Old Mine
An old mine cut diamond is an antique cushion-shaped cut, hand-cut from roughly the early 1700s through to the late 1800s, long before electric light and modern faceting. It has a soft, squarish outline, a tall crown, a small table and a large open culet that shows as a little circle in the centre, and it was cut to glow under candlelight rather than to throw out the bright sparkle of a modern brilliant. No two are quite alike, so each stone is judged on its own.
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View radiant cut ringsFrequently asked questions
- What is a radiant cut diamond?
- A radiant cut diamond is a square or rectangular brilliant-cut diamond with cropped corners. It sits between an emerald cut and a princess cut, structured and geometric but with the lively sparkle of a brilliant facet pattern.
- What is an elongated radiant cut diamond?
- An elongated radiant is a radiant cut with a longer outline, usually a length-to-width ratio between 1.15 and 1.35. It faces up larger on the finger than a square radiant of the same carat weight and reads closer to an emerald silhouette.
- What is the ideal ratio for a radiant cut diamond?
- A square radiant looks best between 1.00 and 1.05. An elongated radiant typically sits between 1.15 and 1.35, with somewhere around 1.20 to 1.30 reading balanced to most buyers. The right ratio comes down to the look you want and how the stone sits with the band.
- What is the difference between a radiant cut and a cushion cut?
- Both have softened, non-sharp corners, but a radiant has clearly cropped corners and crisper edges, while a cushion has rounded, pillowy corners. A radiant usually looks sharper and more geometric, and a cushion looks softer and more romantic.
- Is a radiant cut sparklier than an emerald cut?
- Usually, yes. A radiant cut uses brilliant-style facets that return light in many small flashes, while an emerald cut uses step facets that show broader, slower flashes.
- What is the best setting for a radiant cut diamond?
- Solitaire, halo, hidden halo and three-stone settings all suit a radiant cut. A square radiant pairs well with a halo, while an elongated radiant often looks best in a solitaire or a three-stone design with tapered or trapezoid side stones.
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