What is a cushion cut diamond
The cushion cut takes its name from its silhouette: square or rectangular with corners softened by curves, like a cushion or pillow. It is one of the oldest diamond shapes still in regular use. The old mine cut, which was the dominant shape from approximately the 1700s through the early 1900s, is the direct ancestor of the modern cushion. Old mine cuts were cut by hand to preserve the most weight from each rough crystal, with high crowns, small tables, large culets, and proportions optimised for candlelight rather than electric illumination.
When electric light and the round brilliant arrived in the early twentieth century, the old mine cut fell out of fashion. Round brilliants, with their mathematically optimised proportions, simply outperformed the hand-cut squares in direct electric light. The cushion cut persisted as a niche shape through the twentieth century and began its modern revival in the 1990s and 2000s, partly driven by interest in vintage and antique jewellery and partly by the shape's genuine warmth and softness compared to the geometric precision of rounds and princesses.
The modern cushion is different from its old mine ancestor. It uses more facets, tighter proportions, and a facet arrangement designed for contemporary lighting conditions. But it retains the rounded corners and soft outline that give the shape its distinctive character.
A diamond with a square or rectangular outline, rounded corners, and curved sides. Uses a modified brilliant facet pattern. Two main variants exist: the classic cushion (also called cushion brilliant or standard cushion), which shows large defined facets and a chunky sparkle pattern; and the crushed-ice cushion (also called modified cushion brilliant), which shows a fragmented, shimmery internal pattern. No standardised GIA cut grade exists for cushion cuts. Buyers must evaluate proportions and visual character independently.
Classic cushion vs crushed-ice cushion: the distinction that matters most
This is the most important section in this guide. Many buyers purchase a cushion cut without understanding that the two types look entirely different, and then feel disappointed when their stone does not match what they had imagined.
The classic cushion, sometimes called a cushion brilliant or standard cushion, has large, clearly defined pavilion facets. When viewed face-up, you can see individual facets reflecting light in distinct flashes. The sparkle pattern is chunky, bold, and somewhat similar to the old mine cuts that inspired the shape. The stone has visual depth and character. Large facets mean individual light flashes are broader and more defined. This is the cushion cut most people picture when they say they want a cushion.
The crushed-ice cushion, also called a modified cushion brilliant, has an additional row of pavilion facets that break up the large facets of the classic type. The result is a completely different visual effect: instead of large defined flashes, the stone shows a fragmented, sparkling pattern with countless tiny reflections. The face-up appearance resembles crushed ice or the shimmer of water. Individual facets are not distinguishable to the naked eye. The pattern is similar in character to a round brilliant but spread across a square or rectangular outline.
Neither type is better. They are different aesthetics for different people. The classic cushion appeals to buyers who want a vintage feel, visible depth, and a shape with personality. The crushed-ice appeals to buyers who want maximum sparkle density in a square shape. The problem is that GIA certificates do not distinguish between the two. Both receive the same "Modified Brilliant" or "Brilliant" designation. The only way to know which type you are buying is to look at the stone or view a video of it face-up.
View the stone face-up under diffuse white light. Hold it still, not tilting.
Classic cushion: you can see distinct, large facet reflections. The pattern looks bold and chunky. Individual facets are identifiable.
Crushed-ice cushion: the stone appears to shimmer with tiny, fragmented light reflections. No individual facets are distinguishable. The pattern looks more uniform and sparkly throughout.
If you cannot tell from a photograph, request a video or view the stone in person. The difference is immediately obvious in motion under light.
Face-up comparison of the two cushion cut types. Classic (left) shows large defined facets and bold light flashes. Crushed-ice (right) shows a fragmented, shimmery internal pattern with no visible individual facets. The GIA certificate does not reliably distinguish between them. Always view the stone before purchasing.
Ideal proportions for cushion cut diamonds
Like all fancy shapes, cushion cuts receive no overall GIA cut grade. The certificate shows symmetry, polish, and the 4C grades, but not cut quality. Buyers must evaluate proportions directly. These ranges represent industry consensus for well-performing cushion cuts, applicable to both classic and crushed-ice types.
| Proportion | Recommended range | Why it matters |
|---|---|---|
| Total depth percentage | 58–68% | Cushions are more forgiving of depth variation than rounds. Classic cushions often run slightly deeper (63–67%) due to their facet geometry. Above 70% the stone looks small for its weight. Below 58% risks light leakage. |
| Table percentage | 55–65% | A wider acceptable range than rounds because cushion facet patterns interact differently with table size. Very large tables (68%+) reduce fire. Very small tables (below 50%) are unusual in cushions and reduce brilliance. |
| Length-to-width ratio | 1.00–1.10 (square); 1.15–1.30 (rectangular) | See section below. Ratios between 1.10 and 1.15 are awkward: too rectangular to look square, too square to look rectangular. Decide which you want and check the numbers. |
| Girdle thickness | Thin to Slightly Thick | Cushions do not have the sharp pointed tips of ovals or pears, so they are less vulnerable to chipping. Medium girdles are ideal. Extremely thick girdles add hidden weight. |
| Culet | None or Very Small | As with all brilliant cuts, a culet larger than Small is visible face-up as a dark circle at the centre. |
| Symmetry | Excellent or Very Good | Cushion symmetry is critical. A cushion with uneven corner curves or an off-centre table is immediately visible. Always check symmetry grade on the certificate and inspect the outline shape carefully. |
Many well-regarded cushion cuts have depth percentages of 65 to 68%, which would be considered too deep for a round brilliant. This is normal and not a defect in a cushion. The different corner geometry means cushion cutters often need more depth to achieve proper light return through the curved sides. Judge a cushion's visual performance face-up, not by applying round brilliant depth standards to a different shape.
Shape and length-to-width ratio
Cushion cuts come in two broad outlines: square and rectangular. Both are legitimate choices, but the proportions that look good in each are different, and the awkward middle ground between them is worth avoiding.
A square cushion has a length-to-width ratio of approximately 1.00 to 1.10. At this ratio, the stone reads clearly as a square with rounded corners. The cushion shape is most strongly associated with this square outline in the popular imagination. Square cushions work beautifully in solitaire settings, halo settings, and three-stone settings where the stone sits symmetrically on the finger.
A rectangular cushion has a length-to-width ratio of approximately 1.15 to 1.30. At this ratio, the stone reads clearly as a rectangle with soft corners. Rectangular cushions suit buyers who want an elongated shape without the pointed ends of an oval or pear. They are less common than square cushions but have a distinctive elegance in the right setting.
The ratio range of 1.10 to 1.15 is genuinely awkward. A stone in this range does not read confidently as either square or rectangular. It looks slightly off. If you want a square, stay at 1.10 or below. If you want a rectangle, stay at 1.15 or above. This is not a rule any certificate will enforce for you. Check the measurements listed on the GIA report yourself: length divided by width gives the ratio.
Colour and clarity: what cushions reveal
Cushion cuts show colour more than round brilliants do. The facet pattern of a cushion, particularly the classic type with its large defined facets, does less to scatter and mask colour tints than the tightly packed facets of a round brilliant. For a white-looking cushion in white gold or platinum, G colour is typically the minimum. Many buyers find that H colour cushions show a perceptible warm tint in white settings, particularly in the classic type. F colour gives a reliably colourless appearance in cushions.
The crushed-ice cushion is somewhat better at masking colour than the classic type because its fragmented facet pattern distributes light more evenly and hides colour tints more effectively. Even so, the colour sensitivity recommendation stands: go one grade higher for a cushion than you would for a round to achieve the same face-up colour impression.
For yellow gold or rose gold settings, the rule reverses: a warmer colour grade in a cushion actually enhances the visual harmony with the metal. I or J colour cushions in yellow gold settings look intentionally warm and beautiful, not defective. The romantically warm tone that yellow gold imparts suits the cushion's vintage character particularly well.
Clarity in cushions is forgiving. The brilliant facet pattern, particularly in the crushed-ice type, does an effective job of masking inclusions. VS2 and SI1 are typically eye clean. SI2 should be inspected individually. For the classic type, large facets can occasionally make inclusions more visible than in crushed-ice, so some buyers prefer VS2 or above for classic cushions to ensure a clean appearance.
If you are comparing two cushions of the same stated colour grade, one classic and one crushed-ice, the classic will often appear slightly more tinted. The crushed-ice's fragmented pattern distributes any colour tint across many tiny reflections, making it less perceptible. If you choose a classic cushion, consider buying at F or G colour. If you choose crushed-ice, G or H is generally sufficient for a white-looking stone in a white gold setting.
Best settings for cushion cut diamonds
The cushion cut's soft outline and vintage character make it exceptionally versatile in settings. It is one of the few shapes that looks equally at home in a modern solitaire and an antique-inspired pavé ring.
The halo setting is particularly powerful with cushion cuts. A round-diamond halo around a square cushion creates a striking visual contrast: the soft, rounded inner stone against the circular sparkle of the halo. A cushion-shaped halo (where the surrounding diamonds follow the cushion outline rather than forming a circle) gives a more unified, vintage appearance. Both work beautifully. The halo also adds apparent size, making a 0.80 carat cushion appear similar in visual footprint to a 1.20 carat solitaire.
The solitaire setting in four or eight prongs is the classic choice. Four prongs positioned at the corners of the cushion hold the stone securely and expose the maximum amount of the stone to light. Eight prongs, positioned at the corners and midpoints, offer more security for active wearers at the cost of slightly less exposed stone surface.
Three-stone settings suit square cushions very well. A centre cushion flanked by two smaller rounds, ovals, or trapezoid baguettes creates a symmetrical composition that flatters the cushion's balanced outline. The three-stone setting has a long association with sentimental meaning in engagement jewellery, which suits the cushion's romantic character.
Pavé bands are popular with cushion solitaires. The glittering band contrasts with the cushion's large, soft centre stone. Thin pavé bands suit classic cushions. Thicker pavé or shared-prong bands suit crushed-ice cushions, where the diamond density of the band matches the shimmery, all-over-sparkle quality of the centre stone.
Cushion vs round brilliant: an honest comparison
| Factor | Cushion cut | Round brilliant |
|---|---|---|
| Light return | High, but somewhat less efficient than round. Classic type shows broader flashes; crushed-ice shows denser sparkle. | Maximum. Most efficient shape for returning light to the eye. |
| Apparent size per carat | Similar to round for square cushions. Rectangular cushions appear larger on the finger due to elongation. | Reference baseline. |
| Price per carat | 10–20% less than round for equivalent colour, clarity, and certification. | Highest price due to highest demand. |
| Colour sensitivity | More sensitive than round. Classic type especially shows colour. Buy one grade higher than you would for a round. | Best at hiding colour tints among all shapes. |
| Clarity sensitivity | Classic type slightly less forgiving of inclusions. Crushed-ice very good at hiding inclusions, similar to round. | Good at hiding inclusions through brilliance. |
| Cut grading | No GIA cut grade. Must evaluate proportions and inspect visually. Both classic and crushed-ice types possible without certificate distinction. | GIA grades cut Excellent through Poor. Triple Excellent is a reliable starting filter. |
| Vintage character | Strong, particularly for classic cushions. The closest available shape to the old mine cuts of the Victorian and Edwardian eras. | Modern feel. Associated with the twentieth century and contemporary jewellery. |
| Resale liquidity | Good. Cushion is consistently among the top three most popular shapes, so resale is reasonably liquid. | Best liquidity of all shapes. |
Buying a cushion cut diamond in India
Cushion cuts are available across India's major jewellery retail chains and at specialist diamond dealers in Mumbai and Surat. CaratLane, Tanishq, and Malabar Gold carry cushion solitaires and halo settings. The selection at national chains is predominantly square cushions in the 0.25 to 1.00 carat range, with limited availability above 1 carat.
For larger cushions or specific proportion requirements, buyers are better served by the diamond dealer market at Mumbai's Bharat Diamond Bourse (BDB) in BKC or through certified dealers in Zaveri Bazaar. Both classic and crushed-ice types are available; specifying which type you want when approaching a dealer will considerably narrow the selection and save time.
These are approximate price ranges for natural certified cushion cuts in India as of mid-2026.
| Carat weight | Approx. cushion price range | Equivalent round price range | Approx. saving |
|---|---|---|---|
| 0.50 ct | ₹38,000–₹90,000 | ₹45,000–₹1,10,000 | 15–18% |
| 0.70 ct | ₹68,000–₹1,55,000 | ₹80,000–₹1,80,000 | 12–16% |
| 1.00 ct | ₹1,55,000–₹3,80,000 | ₹1,80,000–₹4,50,000 | 12–18% |
| 1.50 ct | ₹3,40,000–₹7,80,000 | ₹4,00,000–₹9,00,000 | 12–16% |
| 2.00 ct | ₹8,00,000–₹19,00,000 | ₹9,00,000–₹22,00,000 | 12–18% |
Prices approximate for mid-2026, natural diamonds, GIA or IGI certified, Excellent symmetry, F–H colour, VS2–SI1 clarity. Add GST (1.5%) and setting/making charges. Lab-grown cushion cuts are 60–80% less expensive than natural equivalents.
1. Decide: classic or crushed-ice. Do not leave this to chance. Ask the seller specifically which type the stone is and view a video or see it in person before committing.
2. Certificate: GIA or IGI only. Verify at gia.edu/report-check or igi.org/verify.
3. Symmetry: Excellent or Very Good. Uneven cushion outlines are immediately obvious and cannot be corrected by setting.
4. Depth: 58–68%. Do not apply round brilliant depth standards to a cushion.
5. L/W ratio: Decide on square (1.00–1.10) or rectangular (1.15–1.30). Avoid the awkward 1.10–1.15 middle range.
6. Colour: F or G for classic cushion in white gold. G or H for crushed-ice in white gold. I or J acceptable in yellow or rose gold.
7. Clarity: VS2 minimum for classic cushions. SI1 acceptable for crushed-ice if eye clean confirmed.
Sources and data integrity note
Historical context on the old mine cut as the predecessor of the modern cushion is documented in: Antique and Estate Jewelry (GIA Gem Reference Guide Series, 2003); and Scarisbrick, D. (1994). Jewellery in Britain 1066–1837. Michael Russell.
Proportion guidance represents industry consensus among certified gemologists and diamond dealers. No published GIA research establishes standardised cut grades for cushion cuts. Buyers should verify current GIA documentation at gia.edu before purchasing.
Price ranges are broad estimates for mid-2026 based on market pricing patterns. They are not price guarantees. Actual prices depend on the specific stone's 4C values, retailer margins, and market conditions.
Frequently asked questions
What is the difference between a cushion cut and a princess cut?
Both are square or rectangular shapes with similar carat weight and apparent size. The main difference is the corners and the facet structure. A princess cut has perfectly sharp, 90-degree corners. A cushion cut has rounded, curved corners. The princess cut has a more geometric, modern feel. The cushion has a softer, more romantic, vintage feel. The princess cut's sharp corners are a vulnerability: they are prone to chipping if the ring is knocked against a hard surface without proper prong protection. Cushion corners, being rounded, are much more durable. For buyers who love the square shape but have an active lifestyle, the cushion is often the more practical choice.
Is a classic cushion or a crushed-ice cushion worth more?
Price is determined by the 4Cs, certification, and carat weight, not by cushion type. A classic cushion and a crushed-ice cushion of identical proportions, colour, clarity, and carat weight will be priced similarly by the market. The type distinction is about aesthetics, not value. What can affect price is the quality of the cut itself: a well-proportioned, beautifully symmetric cushion of either type will command a premium over a poorly proportioned one with uneven corner curves or an off-centre table. The certificate symmetry grade and your own visual inspection are more reliable price indicators than the type label.
Does a cushion cut look bigger than a round of the same carat weight?
For square cushions, the face-up surface area is approximately equal to a round of the same carat weight. For rectangular cushions (L/W ratio above 1.15), the elongated shape covers more finger area and appears larger. One cushion-specific consideration: because many well-cut cushions have higher depth percentages than rounds (65% vs 61% for a round), two cushions of the same stated carat weight can have meaningfully different face-up diameters. The deeper stone hides weight in the pavilion. Always check the stated millimetre dimensions on the certificate alongside the carat weight when comparing cushion cuts.
What does a cushion cut look like in a halo setting?
A cushion in a halo setting is one of the most striking combinations in ring design. The soft, rounded corners of the cushion contrast with the circular sparkle of a round-diamond halo, creating a visual layering effect that looks both modern and romantic. A cushion-shaped halo, which follows the cushion outline, gives a more unified, vintage appearance. Both approaches considerably increase the apparent size of the centre stone. For buyers whose budget limits the centre stone size, a 0.70 to 0.80 carat cushion in a well-designed halo gives the visual impact of a 1.10 to 1.20 carat solitaire at meaningfully lower cost.
Can I get a cushion cut lab-grown diamond in India?
Yes. Lab-grown cushion cuts are available from most online retailers (CaratLane, BlueStone, Melorra) and through diamond dealers in Mumbai and Surat who handle lab-grown inventory. IGI is the standard certification for lab-grown cushions in India. The same classic vs crushed-ice distinction applies to lab-grown stones. The price advantage is significant: a 1 carat lab-grown cushion with Excellent symmetry, G colour, VS1 clarity, IGI certified, currently costs approximately ₹30,000 to ₹65,000 in India, compared to ₹1,55,000 to ₹3,80,000 for a natural equivalent. The same proportion and visual inspection guidance here applies to lab-grown cushions.
How is a cushion cut different from an old mine cut?
The old mine cut is the historical ancestor of the modern cushion. Old mine cuts were cut by hand from approximately the 1700s through the early 1900s. They have a smaller table, a larger and more visible culet (which appears as a circle from above), a higher crown, and proportions optimised for candlelight rather than electric lighting. They produce large, colourful, romantic flashes of fire in warm light. Modern cushion cuts have more facets, tighter proportions, and a smaller or absent culet, and are designed for contemporary electric lighting. If you find a genuine old mine cut in antique or estate jewellery, do not compare its certificate proportions to modern cushion standards: it is a different cut from a different era and should be evaluated on its own terms.
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