What Is an Elongated Cushion Cut Diamond? The Complete Guide

A classic cushion cut is close to square, roughly as long as it is wide, with curved sides and soft rounded corners that give it its pillow-like look and its name. An elongated cushion is the same cut and the same soft corners, simply drawn out so it is clearly longer than it is wide. Nothing about the corners or the curve changes. Only the proportion does.

That single change does two useful things. It makes the stone wear long and slender on the hand, flattering the finger the way any elongated shape does. And it spreads the stone's weight across a longer face-up surface, so an elongated cushion looks larger than a square cushion of the same carat weight. It is a modern preference rather than an antique cut, and it has become one of the most popular ways to wear a cushion.

Worth clearing up early: the elongated cushion is a proportion, not a separate species of diamond. It is the cushion cut, cut long. So everything that is true of cushions in general, the soft corners, the brilliant faceting, the romantic sparkle, is true here too, just stretched along one axis.

Two elongated cushions with the same outline can sparkle very differently, and the reason is faceting. Cushions are cut in two broad styles, and the choice is personal, not a matter of quality. This is the single most useful thing to understand before you shop, because it decides the whole character of the stone.

On a grading report, a crushed-ice style usually shows as "Cushion Modified Brilliant," while a chunkier style often shows as "Cushion Brilliant." Treat those labels as a hint rather than a guarantee, because the exact facet arrangement varies from cutter to cutter, so the only reliable test is to look at the stone itself.

Neither style is better. If you want soft, sparkly, and forgiving, choose crushed ice. If you want bold, open flashes and more contrast, choose chunky. One practical consequence is worth knowing: because crushed ice hides inclusions and slight color, you can often step down a clarity or color grade and still keep an eye-clean, white-looking stone, while a chunky cushion is more revealing, so it rewards a cleaner stone. For how those grades trade off, our guide to reading a diamond grading report walks through the 4Cs in plain terms.

Length-to-width ratio is the number that controls how elongated the stone looks, and it is printed on the grading report so you can shop for it deliberately. Take the length and the width in millimeters from the report and divide the first by the second. A classic cushion sits near 1.00 to 1.05, essentially square. An elongated cushion generally runs from about 1.20 up to 1.50 or so.

There is no single correct ratio, only the look you want on the hand. Lower ratios keep more of the cushion's romantic character; higher ratios lean into the long, elegant line. Because ratio is a measurement rather than a grade, decide the look first, then shop the number, and remember that the same ratio can read a touch different depending on the faceting and the setting. For how every shape's proportions compare, see our diamond shapes guide.

Every elongated brilliant-cut shape, including ovals, elongated cushions, and marquises, can show a bow-tie: a darker band of shadow that runs across the center of the stone from side to side, shaped a little like a bow tie. It happens when the facets in the middle of the stone send light back toward your own head and hand instead of returning it to your eye, so that central zone reads dark. It is an optical effect of the geometry, not damage and not an inclusion.

A faint bow-tie is normal and shows up in almost every elongated stone. What you are checking is severity. A slight shadow you would not notice day to day is fine. A heavy, dark band that swallows the center of the stone is a cutting fault, and no clarity or color grade fixes it. It is not printed on the grading report, because most fancy shapes carry no overall cut grade, so the only way to judge it is to look at the actual stone face-up in good light, or a true-to-life video, and watch how the center behaves as the stone moves.

The higher the ratio, the more room there is for a bow-tie to appear, so on a long, slim elongated cushion this check matters more, not less. Our guide to the bow-tie effect shows what a light one versus a heavy one looks like, and if size on the hand is a priority, our guide to which diamond shape looks biggest explains why elongated cuts spread so well.

Several long, softly shaped stones are easy to confuse from a distance. The difference lives in two places: the corners or ends, and the proportion. Here is how the elongated cushion sits next to the shapes it gets mistaken for.

Against a classic cushion, the only difference is length: same soft corners, same faceting, just drawn longer. Against an oval, the two can share a similar overall length, but they differ at the edge. The cushion keeps four gently defined, rounded corners and a squared-off feel, while the oval is one continuous curve with no corners at all. An elongated cushion is a good pick if you want the oval's long, finger-flattering line but prefer a slightly softer, more vintage outline.

Against an elongated hexagon, the contrast is sharpest. The cushion is all soft curves and rounded corners, while an elongated hexagon is built from straight, angled sides that meet in angular corners or points, so it reads geometric and architectural rather than romantic. The best-known elongated hexagon is the Dutch Marquise, which tapers to a point at each end. If you are torn between a soft, curved look and a crisp, angular one, that is the real decision between these two.

An elongated cushion tends to suit someone who wants length on the finger but prefers a soft, romantic outline to a sharp, geometric one. It sits neatly between an oval and a classic cushion: the oval's flattering, elongating line, with the cushion's gentler, more vintage feel and rounded corners. If a plain oval reads a touch too sleek and a square cushion a touch too compact, this is the shape that splits the difference.

The two faceting styles pull in slightly different directions here. The crushed-ice version appeals to people drawn to a soft, antique, glittering look, and it is forgiving on clarity and color. The chunky version suits someone who wants bolder, cleaner flashes and a more open, transparent stone. Because an elongated cushion faces up large for its weight, it also appeals to a buyer who wants visible presence on the hand without moving up in carat. And it flatters most hands, since the long axis draws the eye down the finger.

Stienhardt is a New York City jeweler that sources Lab Grown Diamonds and hand-sets and finishes them in NYC, selling direct, so we own and inspect every stone we sell and hand you its independent report rather than just drop-ship it. In-person viewings are by appointment. A Lab Grown Diamond is a real diamond, identical in material and hardness to a mined one, and it is graded by the same laboratories, so the shape and the report are what you are actually buying.

And the framing that matters most: choose an elongated cushion because you love the soft, romantic outline drawn long on the hand. A diamond is a love piece, something you keep and that comes to mean something over time, not an investment. If you want the flattering length of an oval with a gentler, more vintage feel, this is the cut that does it.

If you would rather judge a stone in person, we show by appointment in New York. Book a viewing.