Square Diamond Rings: Princess vs Cushion vs Radiant
Posted by YANIV SEGAL
There are three main square diamond cuts. Princess has sharp 90-degree corners and crisp, bright sparkle. Cushion has rounded corners and soft, broad flashes of light. Radiant has trimmed corners and combines brilliance with a sturdier outline. Pick princess for modern edge, cushion for vintage romance, radiant for sparkle with fewer worries about chipping.
What counts as a square diamond ring?
A square diamond ring is any ring whose center stone has a square or near-square outline. Three cuts cover almost every square ring you will see: princess, cushion and square radiant. Asscher cuts are also square, but they are step cut, like a square emerald cut, so they belong to a different family with a hall-of-mirrors look rather than sparkle.
All three main cuts can also be cut slightly rectangular. If you specifically want a square, look for a length-to-width ratio close to 1.00, and up to about 1.05 still reads as square on the hand.
Princess vs cushion vs radiant: comparison table
| Feature | Princess | Cushion | Radiant |
|---|---|---|---|
| Corners | Sharp, pointed 90-degree | Rounded, pillow-like | Trimmed (cut) corners |
| Sparkle style | Bright, crisp, many small flashes | Broad, softer flashes of fire | Very lively, brilliant faceting |
| Corner durability | Most exposed: protect corners | Excellent: no points | Very good: no sharp points |
| Look per carat | Slightly smaller face-up than its weight suggests | Similar to princess; softer edge | Looks a bit larger thanks to brilliant faceting and spread |
| Era and mood | Modern, clean, geometric | Vintage, romantic | Modern-glam, art deco hybrid |
| Best setting | V-prongs or bezel on corners, halo | Four or six prongs, vintage halo | Prongs or halo; hides little |
| Best for | Minimalists, modern taste | Antique and vintage lovers | Sparkle lovers who want durability |
Princess cut: crisp and modern
The princess is the most popular square cut and the most geometric. Its pyramid-shaped pavilion gives it bright, chopped sparkle, and its sharp corners give a clean, architectural outline. The trade-off is those corners: they are the thinnest part of the stone, so a hard knock can chip them. Set a princess with V-prongs or a protective halo. A floating halo, as on Candice No. 39, or a hidden halo, as on Daria No. 707, both add sparkle around the corners. For gemstone versions, princess cuts in blue topaz and peridot add color while keeping the modern lines.
Cushion cut: soft and vintage
A cushion cut has curved sides and rounded corners, like a pillow. It returns light in larger, slower flashes than a princess, which gives it a warm, candlelit look that pairs naturally with filigree, milgrain and vintage halos. With no sharp points, it is the most forgiving square shape for everyday wear. Elaina No. 45 shows how well a cushion sapphire fits a vintage filigree setting. Our guide to antique-style engagement rings explores that look further.
Radiant cut: brilliance with trimmed corners
The radiant combines the outline of an emerald cut with the faceting of a brilliant. Its corners are trimmed, so there are no sharp points to protect, yet it sparkles almost as much as a round. Radiants are often cut rectangular. On our product pages, radiant and emerald cut stones share one size chart, built around rectangular proportions: 1 carat is 7 x 5 mm and 2 carats is 8.5 x 6.5 mm. If you want a true square radiant, contact us before ordering, or start from a photo through our custom ring from a photo service. For large stones, our guide to 4 carat radiant cut rings covers diamond, emerald and ruby options.
Which square cut suits whom?
- You love clean, modern design: princess, ideally with a bezel or protected corners.
- You love vintage and soft light: cushion in a halo or filigree setting.
- You want the most sparkle with fewer worries: radiant.
- You work with your hands: cushion or radiant, since neither has sharp corners.
- You want a dark, graphic square: any of the three in black diamond or black moissanite. Our black moissanite guide compares the budget option.
Choosing a square diamond ring: checklist
- Decide on corners first: sharp (princess), rounded (cushion) or trimmed (radiant).
- Ask for a ratio near 1.00 if you want a true square.
- Protect princess corners with V-prongs, a bezel or a halo.
- Pick your stone: Premium Moissanite, lab created or natural diamond, or a colored gem.
- Select your metal; the product photo switches to the exact metal and stone you choose.
- See the size on your hand with a $199 Try It In Real Life replica.
The Try It In Real Life replica is available for any ring design, sizes 4–13 including half sizes. You keep it, and the full $199 is credited toward any order of $1,000 or more; the credit never expires. Every ring is made to order in Los Angeles with conflict-free stones, free 60-day resizing and free worldwide shipping.
Shop the look
- Princess-Cut Floating Halo Black Diamond Engagement Ring - Candice No. 39, from $6,471. Princess cut in a floating halo that guards the corners.
- Princess Cut Mix Black Diamond Ring - Mya No. 8, from $4,349. Princess cut with a mix of black and white diamonds.
- Cushion Black Diamond Halo Engagement Ring - Jade No. 24, from $4,828. Cushion center in a black diamond halo.
- Sapphire Vintage Filigree Cushion Cut Engagement Ring - Elaina No. 45, from $6,640. Cushion sapphire in vintage filigree.
- Cushion Hidden Diamond Black Diamond Ring - Nova No. 8, from $5,252. Cushion black diamond with hidden diamond detail.
Prefer the trimmed-corner look? Browse our radiant cut engagement rings.
Frequently asked questions
What is the difference between princess and cushion cut? Princess has sharp 90-degree corners and crisp sparkle; cushion has rounded corners and softer, broader flashes of light.
Which square diamond cut sparkles the most? Princess and radiant both use brilliant faceting and sparkle strongly. Radiant adds trimmed corners, which make it more durable.
Are princess cut diamonds prone to chipping? Their sharp corners are the weak point. V-prongs, a bezel or a halo protect them for everyday wear.
Is a radiant cut square or rectangular? Both exist. Radiants are often rectangular; the radiant sizes on our product pages follow rectangular proportions, such as 7 x 5 mm at 1 carat.
Which square cut is best for an active lifestyle? Cushion or radiant, since neither has sharp corners to chip.
