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A cushion is a brilliant-cut stone with softly rounded corners and gently curved sides — a pillow shape, descended from the cuts that lit candlelit rooms for two centuries before the round brilliant existed. It throws exceptional fire, and the single most important decision when choosing one is not carat or colour: it is whether you want chunky facets or crushed ice.
The Montare standard for cushion
| Proportion | Montare floor | Why it matters |
|---|---|---|
| Table % | 60–62% | The flat top facet. Too wide and the stone loses fire; too narrow and the centre reads dark. |
| Depth % | 61–67% | How deep the stone is cut. Outside the ideal band light escapes through the bottom instead of returning to your eye. |
| Length-to-width | 1.25–1.35 | The outline’s proportions. Outside this band the shape starts to look stubby or unnaturally thin — at the same carat weight. |
| Face-up at 3 ct | 10.0 × 7.7 mm | The spread you actually see face-up, at our three-carat minimum. |
These are not market averages — they are the range every Montare cushion must fall inside before we will set it. Proportions are held per shape, not to one universal number.
What a cushion reveals
Every shape is honest about different things. This is what the cushion shows you — and what it hides.
| Faceting style | Brilliant |
| Shows inclusions | Hides them well |
| Shows body tint | Slight |
| Bow-tie risk | Mild |
| Vulnerable points | None |
This is why the floor is fixed rather than negotiable: at D–E colour and VVS clarity, the two questions this shape would otherwise raise are settled before you ever see the stone.
Key takeaways
- The cushion descends from the old mine cut — the dominant diamond shape from the 1700s to the early 1900s.
- Chunky or crushed ice is the real choice: bold readable flashes, or a shimmering watery scatter.
- Cushions throw exceptional fire — more coloured flash than almost any other shape.
- Every Montare cushion is elongated, 1.25–1.35 length-to-width. We do not offer square cushions.
- It pairs famously well with halos, which echo the softened outline.
What is a cushion cut?
A cushion is a brilliant cut set inside a softened rectangle: rounded corners, gently curved sides, and a facet arrangement that produces broad, warm flashes rather than the tight, white precision of a round. The name is literal — it looks like a pillow.
Because it is a brilliant cut, it behaves optically like a round rather than like a step cut. It scatters light across many facets, which means it hides faint body colour and small inclusions well, and it responds strongly to cut quality. What distinguishes it from a round is the character of the light: cushions are known for fire — the coloured spectral flash — more than for the white brilliance a round maximises. That is why cushions are so often described as warm or romantic, and why they photograph beautifully in low light.
Where the cushion came from
The cushion is the oldest shape still in common use, and its ancestor is the old mine cut — the dominant diamond form from roughly the 1700s through the early 1900s. Old mine cuts had a squarish outline with rounded corners, a high crown, a large open culet and comparatively few, large facets.
Those proportions were not arbitrary. They were designed for candlelight. Before electric lighting, a diamond had to do its work under a small, warm, flickering source, and large open facets returning broad flashes performed far better in that setting than the many small facets of a modern round would. The old mine cut is what a diamond looks like when it is optimised for firelight rather than daylight.
When electricity arrived and cutting technology advanced, the round brilliant took over — but the cushion persisted, gradually modernising its faceting while keeping the pillow outline. What you buy today is a shape with genuinely antique lineage and thoroughly modern optics, which is much of its appeal.
Chunky versus crushed ice
This is the decision that matters most, and it is the one buyers most often do not know exists until they see two cushions side by side and cannot explain why they look so different.
A chunky cushion — sometimes called antique-style — has fewer, larger pavilion facets. Its sparkle is bold and readable: you can see distinct flashes, and the facet pattern remains legible from across a table. It looks closer to its old mine ancestry, and it reads as more deliberate and architectural.
A crushed ice cushion has a more intricate arrangement with additional pavilion facets, breaking light into many small reflections. The pattern dissolves into a glittering, watery shimmer with no readable geometry — like light on broken ice, which is where the name comes from. It reads as softer, sparklier and more contemporary.
Technically the difference sits in the pavilion. A cushion brilliant carries four main pavilion facets, producing those large bold flashes. A cushion modified brilliant adds more — eight mains plus a further row — splitting the light into finer, faster scintillation. Certificates will often name the cut as "cushion brilliant" or "cushion modified brilliant", which is a useful clue, though the visual result still varies between stones.
Neither is better. They are genuinely different aesthetics, and it is worth deciding which you want before comparing stones — otherwise you will be comparing two things that were never trying to do the same job. Crushed ice tends to look larger and busier; chunky tends to look more substantial and old-world.
Every centre diamond is Triple Excellent, D–E, VVS and at least three carats — the hard calls are made for you.
Design a cushionWhy every Montare cushion is elongated
Cushions exist across a wide range of outlines, from perfectly square to distinctly rectangular. Montare offers elongated cushions only, held between 1.25 and 1.35 length-to-width. That is a deliberate house choice rather than a technical limitation, and it is worth explaining.
An elongated cushion does two things a square one does not. It reads larger face-up at the same carat weight, because the weight is spread across a longer footprint rather than held in a compact square. And it lengthens the finger, in the same way an oval does but more gently — the softened corners keep the effect subtle rather than dramatic.
At a three-carat minimum, that matters more than it would at one carat. A well-proportioned three-carat Montare cushion measures approximately 10.0 × 7.7mm. The same weight in a square outline would spread across a noticeably smaller face.
Square cushions are a legitimate and beautiful shape; they are simply not what we make. If you have seen a cushion described as "1.00 to 1.10 ratio" elsewhere, that is a square cushion — a different stone from the one we set, and worth knowing when you are comparing.
How to read a cushion's proportions
Cushions run deeper than most shapes, and their ideal bands reflect that. Montare holds every cushion to a table of 60–62% and a depth of 61–67%.
That depth range is wider and higher than an oval's or a round's, and it is not a lower standard — it is the proportion set that makes a cushion behave like a cushion. The depth is where the fire comes from: light travelling further inside the stone before returning has more opportunity to disperse into spectral colour. Cut a cushion shallow to chase face-up size and you trade away the exact quality people choose the shape for.
The trade-off is real and worth stating plainly. A cushion at the same carat weight will generally face up somewhat smaller than an oval, because more of its weight sits in depth. What you receive in exchange is fire. That is the bargain the shape makes, and holding depth inside a tight band is how we make sure you get both sides of it rather than only the cost.
The best settings for a cushion
A cushion has no vulnerable points and a forgiving outline, so most settings work. Three suit it particularly well.
A halo is the classic pairing, and for a structural reason: a ring of small diamonds follows the cushion's softened corners naturally, echoing the curve rather than fighting it, and it amplifies the shape's warmth. It is the pairing most people picture when they picture a cushion. A hidden halo achieves something subtler — brilliance lifted from beneath while the pillow silhouette stays completely clean face-on. A pavé band carries that warmth down the finger, which suits the cushion's softer, more romantic character better than a stark plain band does.
Because a cushion is a curved, cornerless shape, prong choice is about aesthetics rather than protection — there is no point to shroud as there is on a pear or marquise. Four prongs leave more of the outline visible; six sit more securely at larger carat weights.
Cushions and the Montare standard
Every Montare cushion is lab-grown, D–E colour, VVS1–VVS2 clarity and Triple Excellent — excellent cut, polish and symmetry — with a table of 60–62%, a depth of 61–67% and an elongated 1.25–1.35 outline. Three-carat minimum, IGI certified, made to order in Toronto.
The cushion is a shape where the market's variability is unusually wide. Faceting style is not standardised, outlines run from square to distinctly rectangular, and depth varies a great deal because cutters can chase either fire or face-up size. Two stones sold as "3 carat cushion" can be genuinely different products.
Fixing the standard removes most of that variability before you ever see a stone. What remains is the one decision that is actually about taste — chunky or crushed ice — and that is a conversation worth having properly. The full range is set out on our standards page.
Choosing your cushion’s ratio
Two cushions of identical carat weight can look markedly different depending on length-to-width. Montare holds every cushion between 1.25–1.35 — this is how the band behaves inside that range.
| L:W | Look | Who it suits |
|---|---|---|
| 1.25 | Broader, rounder outline | Reads closest to a classic silhouette and sits wider on the finger. |
| 1.30 | The balanced middle | The most universally flattering point in the band, and what most buyers choose. |
| 1.35 | Narrow and dramatic | Maximum finger-lengthening; the outline reads bold rather than traditional. |
Settings that suit a cushion
- HaloA halo squares up beautifully against soft cushion corners.
- Hidden HaloPresence from below while the cushion outline stays pure.
- PavéWarmth along the band suits the cushion’s softer character.
Every Montare cushion is set to one fixed standard — D–E colour, VVS clarity, Triple Excellent cut, three carats minimum, IGI certified. Start with the cushion already selected.
Design a cushion →Looking for finished designs rather than the decision? See our cushion engagement rings.
Frequently asked questions
What is the difference between chunky and crushed ice cushions?
Chunky cushions have fewer, larger pavilion facets and produce bold, readable flashes. Crushed ice cushions have more, smaller facets that break light into a shimmering watery scatter with no readable pattern. Neither is better — they are different aesthetics, and it is worth choosing before you compare stones.
Are Montare cushions square or rectangular?
Elongated, always — between 1.25 and 1.35 length-to-width. We do not offer square cushions. An elongated cushion reads larger face-up at the same carat weight and lengthens the finger.
How big is a 3 carat cushion?
Approximately 10.0 × 7.7mm when well proportioned to our elongated standard. A square cushion of the same weight would face up across a noticeably smaller area.
Why are cushions cut deeper than other shapes?
Depth is where the fire comes from. Light travelling further inside the stone before it returns has more opportunity to disperse into spectral colour. Montare holds cushions to a 61–67% depth, which is higher than an oval's or a round's by design, not by compromise.
Do cushion cuts sparkle as much as rounds?
They sparkle differently. A round maximises white brilliance; a cushion is known for fire — the coloured spectral flash. Cushions tend to look especially good in low and warm light, which is a direct inheritance from the candlelit rooms their ancestors were cut for.
What setting suits a cushion best?
A halo is the classic pairing, because it follows the softened corners naturally and amplifies the shape's warmth. A hidden halo adds brilliance from beneath while keeping the pillow outline clean, and a pavé band carries the warmth along the finger.
Where does the cushion cut come from?
It descends from the old mine cut, the dominant diamond shape from roughly the 1700s to the early 1900s. Those cuts had high crowns, large culets and few large facets — proportions designed to perform under candlelight rather than electric light.
Do cushions hide inclusions well?
Yes. As a brilliant cut, a cushion scatters light across many facets, which disguises small inclusions and faint colour far more effectively than a step cut such as an emerald. At a VVS and D–E floor there is nothing to disguise, but the property is worth understanding when comparing elsewhere.
The Montare standard
Lab-grown · D–E colour · VVS clarity · Triple Excellent · 3ct minimum · IGI certified
Every ring is made to order in Toronto and backed by our lifetime setting upgrade, with free, fully insured shipping.
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