The elongated cushion is a faceted gemstone outline that retains all the defining characteristics of the classic cushion cut — rounded corners, a softly curved perimeter, and a faceting style derived from the old mine cut tradition — while extending the length-to-width ratio beyond approximately 1.15:1. Where a standard cushion typically falls between 1.00:1 and 1.10:1 (approaching square), the elongated cushion stretches toward 1.20:1, 1.30:1, or occasionally beyond, producing a silhouette that reads as distinctly rectangular yet remains unmistakably soft. The style has become particularly prominent in the fancy-coloured diamond and fine sapphire markets, where it is valued both for its optical behaviour and for the elongating visual effect it produces when set as a ring centrepiece.

Historical Context

The cushion cut itself descends from the old mine cut of the seventeenth and eighteenth centuries, a hand-fashioned shape characterised by a high crown, small table, large culet, and a gently squared outline with rounded corners. As mechanised cutting developed through the nineteenth century, the old mine cut was gradually refined into what the trade now calls the modern cushion. Elongated proportions were not uncommon in antique stones — cutters working with elongated rough naturally produced elongated outlines — but the shape was not systematically sought out as a distinct aesthetic category until the late twentieth century. The contemporary appetite for the elongated cushion accelerated notably in the 2010s, driven partly by the popularity of elongated fancy-coloured diamonds appearing at major auction houses, and partly by a broader consumer preference for cuts that maximise apparent finger coverage relative to carat weight.

Defining Proportions

No single gemmological authority has codified a precise threshold at which a cushion becomes an elongated cushion, and the boundary remains a matter of trade convention rather than formal standardisation. The most widely accepted working definition places the lower boundary at a length-to-width (L:W) ratio of approximately 1.15:1. Ratios between 1.15:1 and 1.30:1 are the most commercially common; stones beyond 1.40:1 begin to approach a rectangular or even barion-style outline and may be described differently depending on the cutter's faceting architecture.

Beyond the L:W ratio, the elongated cushion shares the cushion cut's broad internal variation. Faceting arrangements range from the so-called cushion brilliant (with an additional row of facets on the pavilion producing a crushed-ice or glittery appearance) to the chunky cushion (with larger, more defined facets that produce distinct, bold reflections). The choice between these internal architectures has significant consequences for colour performance and brilliance distribution, and is discussed further below.

Optical Behaviour and Colour Performance

One of the principal reasons cutters and buyers favour the elongated cushion for strongly coloured material is the shape's tendency to concentrate and deepen apparent colour saturation. The rounded corners and relatively deep pavilion typical of cushion-style faceting create longer light paths through the stone than shallower brilliant cuts of equivalent weight, which in practice means that body colour is displayed more richly. This effect is particularly valued in vivid blue sapphires, padparadscha sapphires, and fancy-coloured diamonds, where colour grade is the primary value driver.

The internal faceting style modifies this behaviour substantially. A cushion brilliant with its fine, numerous pavilion facets produces a dispersed, scintillating return of light that can make colour appear slightly less saturated but more lively. A chunky or modified cushion with broader facets produces larger, more defined flashes and tends to display body colour more directly and intensely. Cutters working with high-saturation rough — Burmese pigeon-blood ruby, Kashmir sapphire, or vivid yellow diamond — often favour the chunkier faceting arrangement for this reason.

The elongated outline also affects the distribution of colour across the face of the stone. In strongly pleochroic gems such as tanzanite or alexandrite, the orientation of the table relative to the crystallographic axes must be chosen with care; an elongated cushion oriented to display the preferred pleochroic colour along the long axis will show that colour most prominently in face-up view.

Cutting Considerations and Yield

Elongated cushion outlines arise naturally when the available rough is itself elongated — as is frequently the case with sapphire crystals from alluvial deposits, which are often tabular or prismatic rather than equidimensional. A cutter working with such rough may achieve a significantly higher yield by following the natural elongation of the crystal rather than forcing a square outline. This practical consideration means that elongated cushions are common among fine sapphires from Sri Lanka, Madagascar, and Montana, where the alluvial rough frequently presents in elongated forms.

Conversely, when a cutter deliberately produces an elongated cushion from more equidimensional rough, yield is sacrificed in exchange for the aesthetic or market premium that the shape commands. In the fancy-coloured diamond market, where rough is priced per carat and every point of yield matters, the decision to cut an elongated cushion rather than a square cushion or oval is a considered commercial judgement.

Setting and Jewellery Design

The elongated cushion occupies a design niche between the romantic softness of the round brilliant or square cushion and the more assertive geometry of the emerald cut or radiant cut. Its rounded corners make it more resistant to chipping than a princess cut or sharp-cornered radiant, a practical advantage in everyday wear. The elongated outline creates the visual illusion of greater finger length when set as a solitaire, a quality shared with the oval and marquise but delivered here with a softer, less pointed silhouette.

In terms of setting architecture, the elongated cushion is most commonly mounted in four-claw or eight-claw solitaire settings, halo settings (where a surrounding border of smaller stones emphasises the outline), and three-stone configurations in which the elongated cushion serves as the centre stone flanked by trapezoids, half-moons, or smaller cushions. The absence of sharp corners simplifies bezel and semi-bezel setting, making these options more practical than they would be for a princess or radiant cut of equivalent size.

Market Position and Notable Examples

The elongated cushion has become one of the more sought-after shapes in the fine and fancy-coloured gemstone market. At auction, elongated cushion-cut fancy-coloured diamonds — particularly vivid yellow, vivid pink, and vivid blue stones — have achieved significant prices per carat, with the shape's rarity relative to round or oval cuts contributing to premiums in certain colour categories. Fine sapphires in elongated cushion form from Burmese, Kashmir, and Sri Lankan origins appear regularly at the major auction houses and in the inventories of specialist dealers.

In the coloured stone trade more broadly, the shape is popular for blue sapphires in the 3–15 carat range, where the combination of colour depth and finger coverage makes it commercially attractive. Padparadscha sapphires in elongated cushion form are particularly prized, as the delicate salmon-pink colour benefits from the shape's colour-concentrating properties without the risk of colour zoning that can affect more transparent cuts.

Grading and Laboratory Reports

Gemmological laboratories including the Gemological Institute of America (GIA) and Gübelin Gem Lab report the shape of an elongated cushion as a cushion cut or cushion modified brilliant, with the length-to-width ratio stated numerically in the proportions section of the report. There is no separate shape designation for the elongated cushion on laboratory reports; the L:W ratio itself communicates the elongation. Buyers and dealers are therefore expected to interpret the reported ratio in the context of their own aesthetic and market preferences. A ratio of 1.20:1 or above is generally understood within the trade to constitute an elongated cushion, though this threshold is not formally defined in laboratory grading standards.

Further Reading

• GIA — Understanding Gemstone Cut
• GIA — Gems & Gemology (journal archive)
• AGTA — Gemstone Education