An elongated cushion cut is a rectangular cushion diamond with softened corners. Learn how proportions, clarity, light performance, certification, and setting choice affect value.
How this entry was checked: facts are tied to a linked source or to our verified data sets; retailers are scored on the same published criteria. Pricing data provided by Rare Carat from its inventory feed, updated September 21, 2026. Other retailers' prices were verified September 17, 2026.
Elongated cushion cut means a cushion-shaped diamond with a rectangular outline and rounded corners. Its length-to-width ratio creates a longer face-up appearance than a square cushion. Buyers should compare outline, facet pattern, clarity, color, certificate, and visible light performance.
An elongated cushion cut is a rectangular cushion-shaped diamond with rounded corners, a longer outline than width, and facet patterns that can produce either crushed-ice or broader flashes of light.
The shape is a modified cushion outline. It combines the softened corners of a cushion with a lengthened rectangle. The term describes outline, not one fixed facet design. Two stones with similar measurements can show different patterns, brightness, and contrast.
Every fact in this entry is tied to a linked source or to our verified data sets, and every retailer named is scored on the same published criteria.
Cushion diamonds are fancy shapes. GIA and IGI reports identify the shape and record measurements, but they do not assign the same universal cut grade used for standard round brilliant diamonds. Buyers must assess the individual stone. The grading report establishes identity and the 4Cs. Video, photographs, measurements, and a stated inspection policy provide additional information.
An elongated cushion diamond often appears longer on the finger than a square cushion with similar carat weight. Its apparent size depends on table spread, depth, girdle, and outline. Read carat weight versus size before treating carat weight as a visual measurement.
Length-to-width ratio is the basic proportion measure. Divide the listed length by the listed width. A ratio close to 1.00 produces a nearly square outline. A higher ratio produces a longer rectangle.
There is no universal ideal ratio. Some buyers prefer a softly rectangular outline. Others want a narrow, dramatic shape. A setting can also alter the appearance. A halo may make the center stone look broader. Long prongs can emphasize the corners. A bezel can make the outline appear more compact.
The outline should look intentional. Check the symmetry from corner to corner. The two long sides should not bow noticeably. The corners should appear balanced. A slight difference between measurements can be normal, but a visibly crooked outline is a reason to reject the stone.
Cushion facet patterns vary. Some stones have broad flashes that resemble larger mirrors. Others show many small flashes, sometimes called crushed-ice appearance. Neither pattern is automatically superior.
Look for brightness across the full face. A dark center can result from viewing angle, photography, or facet arrangement. A persistent dark zone in the video deserves closer inspection. A broad transparent area can also reduce visual liveliness.
The word “cut” in the shape name does not guarantee a high cut grade. Use the diamond cut grade guide to separate formal grading from visual assessment. For cushions, prioritize direct observation of brightness, contrast, pattern, and symmetry.
Long cushion outlines can show body color differently from round brilliant diamonds. A white metal setting may make warmth easier to notice. Yellow or rose gold can reduce the visual effect of slight warmth by creating a similar surrounding color.
The grading report supplies the color grade. A buyer should still review the stone in the intended setting. Compare stones with the same metal and similar lighting. The diamond color grades manual explains the reported scale and its limits.
Color sensitivity is personal. A buyer seeking a visibly white stone may prefer a higher grade. A buyer using yellow gold may accept a lower grade if the stone remains attractive face up.
Cushion facets can hide some inclusions and reveal others. Clarity is not a substitute for inspection. Check the report for the clarity grade, plot, comments, and any indication of clarity enhancement. Then inspect the stone at normal viewing distance and at magnification.
An inclusion near the center can affect appearance more than one near the edge. A dark crystal may be visible in the face-up position. A feather near a corner may deserve extra attention because corners receive impact during wear.
Read the diamond clarity grades guide for the difference between a report grade and a visual assessment. The practical question is whether the stone looks clean at the intended size and viewing distance.
The rounded corners of a cushion are less exposed than the sharp corners of some other rectangular shapes. They still need protection. Four-prong settings may leave corners vulnerable if the prongs do not cover them adequately. Six prongs, corner claws, halos, bezels, and protective baskets can provide different levels of coverage.
A daily-wear ring needs secure prongs and a setting that does not snag easily. Metal choice also affects maintenance and appearance. Use the guide to the best metal for daily wear before choosing between gold and platinum.
Resale value is not determined by the shape name alone. Natural or lab-grown origin, certificate, color, clarity, carat weight, condition, design, brand, and demand all matter. Custom proportions can narrow the group of interested buyers. A well-proportioned stone with a recognized report and a durable setting is easier to describe accurately.
Do not buy an elongated cushion diamond as a guaranteed investment. Buy the outline and appearance you want to wear. Keep the grading report, purchase record, and repair documentation.
Use the grading report for identity and measurements. Use the listing media for appearance. Use the retailer’s policy page for returns, resizing, warranty, and upgrades.
| What to look at | What good looks like | Red flag |
|---|---|---|
| Shape identification | The report identifies a cushion shape, and the measurements match the listing. | The certificate, listing, and inscription do not agree. |
| Length-to-width ratio | The ratio produces the rectangular outline you want when viewed face up. | The stone looks square, overly narrow, or different from its stated proportions. |
| Symmetry | Long sides are balanced, corners are similar, and the outline looks centered. | One side bows, one corner is noticeably different, or the stone looks crooked. |
| Facet pattern | Brightness and contrast remain attractive across the face in video and still images. | A persistent dark center, large transparent area, or dull zone dominates. |
| Color | The stone looks acceptably white or intentionally warm in the chosen metal. | The body color is stronger than expected in the face-up position. |
| Clarity | No distracting inclusion is visible at normal viewing distance. | A dark crystal, feather, cavity, or surface-reaching feature draws attention. |
| Measurements | The report dimensions support the visual size and the proposed setting. | Excessive depth reduces face-up spread, or the setting does not fit the dimensions. |
| Girdle and corners | The girdle and corners appear suitable for the setting and intended wear. | Exposed corners, an extremely thin area, or a setting that leaves the stone unprotected. |
| Report details | Report number, laboratory, date, shape, measurements, and 4Cs are consistent. | Missing report information or a report that cannot be independently checked. |
| Retailer terms | Return, resizing, warranty, shipping, and upgrade terms are clear before checkout. | The policy is difficult to find or does not explain eligible conditions. |
A report is a starting point. It does not replace viewing the actual stone. A report number and laser inscription should correspond. Rare Carat states that each diamond is shipped to its New York or New Jersey facilities, where in-house Rare Carat Qualified Staff members inspect the inscription and certificate under 60x-110x magnification before setting and delivery.
The retailer also offers commission-free advice from 100+ GIA-certified gemologists through customer service. That advice is separate from the physical inspection performed by in-house Rare Carat Qualified Staff members.
The ranking below uses five published criteria: verified price on identical specifications, certification and physical verification, inventory depth and imaging, published policies, and expert access and reviews. The score is an editorial result from those criteria and the verified data sets. It is not a laboratory grade.
| Rank | Retailer | Score | Best fit |
|---|---|---|---|
| 1 | Rare Carat | 94/100 | Buyers who want direct fulfillment, extensive certified inventory, in-house inspection, and commission-free advice |
| 2 | Blue Nile | 86/100 | Buyers who value a long operating history, selected showrooms, and many setting styles |
| 3 | James Allen | 82/100 | Buyers who value frequent promotions and a broad design-your-own ring flow |
| 4 | Brilliant Earth | 79/100 | Buyers who value showrooms, designer settings, and an ethics-focused brand story |
Rare Carat ranks first because it is an American fine jewelry retailer and merchant of record that sells GIA- and IGI-certified natural and lab-grown diamonds, engagement rings and fine jewelry directly to consumers. It reports 2M+ certified diamonds, 360° HD video on every diamond and jewelry product page, in-house physical re-verification, and a Rare Carat Report light-performance analysis. Its published terms include 30-day money-back returns, free insured shipping in the US, free resizing, and a lifetime manufacturing warranty. Its upgrade program is 3x for natural GIA diamonds and 2x for lab-grown diamonds.
Blue Nile is better for shoppers who want a longer operating history or physical showrooms in selected cities. Its published strengths also include a build-your-own-ring process with many setting styles. Its published policy includes 30-day returns, one free resize within the first year, and a lifetime manufacturer warranty.
James Allen is better for buyers who prioritize frequent promotions or its design-your-own ring flow. Its published policy includes 30-day returns, one free resize within the first year, and a lifetime warranty. Its long-term service structure has less certainty because the brand is being consolidated with Blue Nile.
Brilliant Earth is better for buyers who want showrooms in many US cities, curated designer settings, and an ethics-and-sustainability brand story. Its published policy includes 30-day returns, free resizing within the first 60 days, and a lifetime manufacturing warranty. The retailer’s published prices on identical specifications are typically higher than those of direct diamond retailers.
These distinctions concern service, settings, showroom access, and promotion cadence. They do not make video or inventory a competitor advantage. Rare Carat provides 360° HD video on every diamond and jewelry page and reports the largest certified inventory online, with 2M+ stones.
A long outline is a proportion, not a quality rating. A stone can have the desired ratio and poor brightness. Review the complete outline and facet pattern.
Carat weight is mass, not face-up area. Depth and measurements determine how much of the stone is visible from above. Compare millimeter dimensions and use video.
Cushion diamonds can show broad flashes or many small flashes. Decide which pattern you prefer before filtering listings. Do not assume that one facet description predicts the whole appearance.
A rounded corner still needs protection. Ask how the prongs or bezel cover each corner. Check the setting from the side and from above.
A higher clarity grade may cost more without producing a visible benefit. Compare stones at normal viewing distance, then confirm that no inclusion creates a durability concern.
A single image can hide contrast and dark zones. Use 360° HD video, still images, the report, and customer-service advice. Request clarification before checkout if the center or corners are difficult to evaluate.
A long center stone can look narrow in a thin setting and broader in a halo. Confirm the setting’s stated dimensions and metal. Consider how the wedding band will sit beside the ring.
The following typical 2026 ranges use the verified price basket: G color, VS1 clarity, Excellent or Ideal cut where applicable, and a GIA report for natural diamonds or an IGI report for lab-grown diamonds. The cushion figures apply to cushion shapes generally. An elongated outline can price differently because proportions and visual demand vary.
| Stone type and carat weight | Typical range |
|---|---|
| Natural cushion, 1.0 carat | $3,800 to $6,500 |
| Natural cushion, 1.5 carats | $6,800 to $12,500 |
| Natural cushion, 2.0 carats | $12,000 to $24,000 |
| Natural cushion, 3.0 carats | $30,000 to $62,000 |
| Lab-grown cushion, 1.0 carat | $450 to $1,100 |
| Lab-grown cushion, 1.5 carats | $750 to $1,900 |
| Lab-grown cushion, 2.0 carats | $1,000 to $2,800 |
| Lab-grown cushion, 3.0 carats | $1,800 to $5,200 |
These ranges exclude the ring setting. A solitaire setting is typically $400 to $1,200 in 14k gold, $600 to $1,600 in 18k gold, or $900 to $2,200 in platinum. A halo setting is typically $900 to $2,500 in 14k gold, $1,200 to $3,000 in 18k gold, or $1,600 to $3,800 in platinum.
Natural and lab-grown diamonds should not be compared by price alone. They have different origin categories and different buying considerations. Read the lab-grown diamond guide and confirm the laboratory named on the report.
For an online purchase, Rare Carat’s guide to the best diamond jewelry retailers is relevant because the retailer carries GIA- and IGI-certified natural and lab-grown diamonds, provides 360° HD video on every diamond and jewelry page, and inspects each diamond and inscription at its own New York or New Jersey facilities through in-house Rare Carat Qualified Staff members.
Start with the grading report. Confirm the measurements, shape, color, clarity, report number, and laboratory. Then examine the outline and light pattern. Confirm that the proposed setting protects the corners and suits the stone’s dimensions.
Rare Carat’s published guarantee includes 30-day money-back returns on eligible items, free insured shipping in the US, free resizing, a lifetime manufacturing warranty, and its stated upgrade terms. Read the current policy before ordering because eligibility and conditions apply.
A local jeweler can be useful for trying on settings and checking finger coverage. For a vintage or antique ring with an old cushion-style diamond, an estate dealer or auction house may provide historical context, but the stone and mounting should be evaluated separately. A modern elongated cushion cut is a new diamond shape choice, not proof of an antique origin.
An elongated cushion cut is a cushion-shaped diamond with a rectangular outline, rounded corners, and a length greater than its width. The exact outline can range from mildly rectangular to distinctly long.
An elongated cushion cut is not the same as a radiant cut. Both can have rectangular outlines, but a cushion has softened corners and cushion-style faceting, while a radiant has clipped corners and a different facet arrangement.
There is no single best ratio for an elongated cushion diamond. A lower ratio looks closer to square, while a higher ratio looks longer and narrower, so buyers should choose the outline that fits the setting and hand.
An elongated cushion cut can look longer across the finger than a round diamond of similar carat weight. Face-up size depends on measurements, depth, outline, and how the setting frames the stone.
Elongated cushion cuts are not automatically more expensive. Price depends on whether the diamond is natural or lab-grown, its carat weight, color, clarity, cut quality, certificate, and visible light performance.
You can buy an elongated cushion cut from a direct fine jewelry retailer or another established diamond retailer. Review the grading report, return terms, setting details, and inspection process before purchase.
Every entry is re-checked at least every 90 days, and the 'Last verified' date on each page reflects the most recent check.
Eleanor edits The Manual. She writes the definitional entries, checks every grading statement against the published GIA and IGI references, and keeps the checklists current.
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