What Is an Elongated Cushion Cut Diamond?
An elongated cushion is a cushion cut stretched to a longer, rectangular shape: a soft rectangle with gently curved sides and rounded, pillow-like corners, rather than the near-square of a classic cushion. It keeps the cushion's brilliant faceting and soft, romantic sparkle, but because it is longer than it is wide, it wears long on the finger and faces up larger than a square cushion of the same carat weight.
That is the whole definition. Here is what makes it elongated, the length-to-width ratio that controls the look, how it compares to a classic cushion and other elongated shapes, and what to check before buying one.
What makes it elongated
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.
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, not an antique cut, and it has become one of the most popular ways to wear a cushion.
The ratio, and how it reads
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. 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: 1.20 to 1.30 reads as a gently elongated soft rectangle, while 1.40 and above reads distinctly long and slim.
There is no single correct ratio, only the look you want on the hand. Lower ratios keep more of the cushion's plump, 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. For how every shape's proportions compare, see our diamond shapes guide.
Elongated cushion vs classic cushion vs oval
These three curved shapes are easy to confuse from a distance. The difference is the corners and the proportion.
| Shape | Outline | Typical ratio |
| Elongated cushion | Soft rectangle, rounded corners | About 1.20 to 1.50 |
| Classic cushion | Soft square, rounded corners | About 1.00 to 1.05 |
| Oval | Smooth ellipse, no corners | About 1.35 to 1.50 |
So an elongated cushion and a classic cushion share the same soft corners and differ only in how long they are drawn, while an elongated cushion and an oval can share a similar length but differ at the ends: the cushion keeps four gently defined corners, the oval is a continuous curve. An elongated cushion is a good pick if you want the oval's long, finger-flattering line but prefer a slightly softer, more vintage-feeling outline.
What to check before you buy
Pick the ratio on purpose. Decide how long you want the stone to read, then shop the length-to-width number on the report. Around 1.25 keeps it soft and full; around 1.40 and up reads long and elegant.
Look for even sparkle across the length. On a longer cushion, check the actual stone face-up for a dark bow-tie band across the center, the same effect elongated ovals can show. A faint one is normal; a heavy one is a cutting fault. Our guide to the bow-tie effect explains what to look for.
It faces up large, which is a strength. Because the weight is spread along its length, an elongated cushion is one of the more size-efficient cuts. If size on the hand is a priority, see our guide to which diamond shape looks biggest.
Read the grading report and confirm it. A Lab Grown elongated cushion carries the "LG" girdle inscription and is graded by the same labs as any stone, so read the grading report and confirm the number on the lab's own site.
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, 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.
About the Author
Jeffrey Bais
Jeffrey Bais oversees jewelry production with precision and dedication. He ensures every piece meets the highest standards of quality and craftsmanship.
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FAQ's
An elongated cushion is a cushion cut stretched to a longer, rectangular shape: a soft rectangle with curved sides and rounded corners. It keeps the cushion's brilliant faceting but, being longer than it is wide, it wears long on the finger and faces up larger than a square cushion of the same carat weight.
Proportion. A classic cushion is nearly square, with a length-to-width ratio around 1.00 to 1.05. An elongated cushion is the same cut drawn longer, typically about 1.20 to 1.50, so it reads as a soft rectangle, wears longer on the finger, and looks larger for its carat weight.
There is no single correct ratio, only the look you want. Around 1.20 to 1.30 gives a gently elongated, still-plump soft rectangle, while about 1.40 and above reads distinctly long and slim. The ratio is printed on the grading report, so decide the look first, then shop the number.
Yes, for the same carat weight. Stretching the shape spreads the stone's weight across a longer face-up surface, so an elongated cushion covers more of the finger and looks larger than a near-square cushion of equal weight. It is one of the more size-efficient cuts.
No. They can share a similar length, but an elongated cushion keeps four gently defined, rounded corners and a soft rectangular outline, while an oval is a smooth, continuous ellipse with no corners. An elongated cushion gives the oval's flattering length with a softer, more vintage feel.
Yes. The elongated cushion is a shape, so it is cut on Lab Grown Diamonds like any other. A Lab Grown elongated cushion is a real diamond, graded by the same labs and carrying the "LG" girdle inscription, and it costs well under a comparable mined stone, which makes its large face-up size especially good value.