Elongated Cushion Cut Diamond Size (Chart, Dimensions, On Hand)
Elongated Cushion Cut Diamond Size (Chart, Dimensions, On Hand)
April 5, 2022
Last Updated: February 16, 2026
Quick Summary
Elongated cushion cut diamonds feature rounded corners like traditional cushions but have a longer, rectangular shape defined by a length-to-width ratio greater than 1:1.1. Size increases steadily with carat weight, ranging from about 6.3 x 5.05 mm at 1 carat to 10.8 x 8.6 mm at 5 carats. Evolving from the vintage old mine cut, modern elongated cushions offer enhanced brilliance with 64 or more facets. They appear larger than square cushions of the same carat weight and can create a flattering, lengthened look on the finger. Prices are typically comparable to square cushions with similar grades. For best results, consider eye-clean clarity and color grades of H or higher.
Want to see how an elongated cushion cut diamond looks on your hand at 1, 2, or more carats? You’re in the right place. We made the chart and images below to give you an idea of how big elongated cushion cut diamonds are at different weights.
Elongated Cushion Diamond Dimensions & Sizes
Length (mm)
Width (mm)
Elongated Cushion Weight (ct)
6.3 mm.
5.05 mm.
1 ct.
7.25 mm.
5.8 mm.
1.5 ct.
8 mm.
6.4 mm.
2 ct.
8.5 mm.
6.8 mm.
2.5
ct.
9.1 mm.
7.3 mm.
3
ct.
9.6 mm.
7.65 mm.
3.5
ct.
10 mm.
8 mm.
4
ct.
10.4 mm.
8.3 mm.
4.5
ct.
10.8 mm.
8.6 mm.
5
ct.
What are an Elongated Cushion Cut Diamond’s Dimensions?
The Naomi with a 3 carat Elongated Cushion cut Diamond in White Gold with The 1.5mm Helen band and Pave X Ring in Rose Gold
Elongated cushion cut diamonds have rounded corners, much like a cushion cut. The only difference is they have a longer, rectangular structure. Technically, it's an elongated cushion cut when the length to the width ratio surpasses 1:1.1.
How close the cut comes to a square or rectangular shape is a matter of choice, style, and personal taste. But usually, elongated cushion cuts are tall and skinny.
Cushion cut and elongated cushion cut diamonds are an updated version of the old mine cut from the 1700s. Also known as the candlelight cut, it’s considered a vintage style. The old mine cut was used to cut diamonds from Brazil. After diamonds were discovered in South Africa, Brazil’s mines became known as the old mines. This is how the cut got its name. The old mine cut had 58 facets. The modern cushion cut has 64 large, brilliant facets or more.
Elongated cushion cut diamonds display a high level of brilliance and fire. In fact, it is only slightly less brilliant than a round cut.
Maximising Your Elongated Cushion Cut Diamond’s Size
The Low Profile Kamellie with a 2 carat Radiant Cut Diamond and The Pave Crown Kamellie with a 2 carat Elongated Cushion
Square cushions tend to appear smaller than other cuts. Elongated cushion cuts, though, appear larger for the same carat weight. Because of its shape, elongated cushion diamond rings also make fingers seem longer.
Does this mean an elongated cushion cut diamond will cost more? No. Both square and elongated cushion cut diamonds with the same color, carat, and clarity will usually have similar prices.
Just like cushion cut diamonds, elongated cushion cuts hide inclusions well. As long as they’re eye-clean, you don’t have to spend a fortune for high clarity. An SI1 rating can still result in a striking piece of jewelry.
Cushion cut diamonds naturally have a visible yellow tinge. So, spending a bit more for the color grade such as H or higher will be a worthwhile investment.
FAQ
Are elongated cushion cut rare?
Yes. The longer the cushion, the rarer the diamond. Diamonds that are around 1.10 and below, are common. Stones between 1.11 and 1.18 are rare and stones above 1.19 are even rarer.
Do elongated cushion cuts look bigger?
Yes. Elongated cushion cut diamonds tend to look slightly bigger for the same carat weight.
What is the ratio for an elongated cushion cut?
Typically, an elongated cushion cut with a square-ish shape will have a ratio of 1:1 or 1:1.5, meaning that one side is only slightly longer than the other. Rectangular elongated cushion cuts typically have a ratio of 1:2, where one side can be twice as long as the other.
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