Elongated Cushion Cut Diamond: Everything You Need to Know Before Buying
An elongated cushion cut diamond has a rectangular shape with rounded corners. It is longer and less square than a classic cushion cut diamond. But not all elongated cushion diamonds look the same.
Some have bold flashes of sparkle, while others have lots of tiny sparkles. Even diamonds with similar measurements can look different. In this guide, we'll explain how to choose an elongated cushion cut diamond, what to look for before buying, and how to find the right style for your ring.
What Is an Elongated Cushion Cut Diamond?
An elongated cushion cut diamond is a cushion-shaped diamond with a rectangular rather than nearly square outline. It has four rounded corners and a faceted surface designed to return light.
A cushion cut can have several different facet arrangements. Some elongated cushions display larger, more clearly defined flashes of light. Others have many smaller flashes that create a crushed-ice appearance.
A Brief Look at the Cushion Cut's History
The cushion cut comes from older diamond styles, especially a shape known as the Old Mine Cut. In the past, diamonds were cut using simpler tools and methods. Many old cushion diamonds had a raised top and a smaller flat surface.
Today, diamond cutters use modern tools and techniques to create many different cushion styles. Some have a square shape, while others are longer and rectangular. Their sparkle can also look different depending on how they are cut.
Understanding the Anatomy of an Elongated Cushion Diamond
|
Diamond part |
What it means |
Why it matters |
|
Table |
The large, and flat facet on top |
Affects the face-up appearance and how light enters and leaves the diamond |
|
Crown |
The upper portion above the girdle |
Its height and facets contribute to the diamond's appearance |
|
Girdle |
The narrow edge separating the crown and pavilion |
Matters when assessing the stone's construction and setting |
|
Pavilion |
The lower portion beneath the girdle |
Its angles and facets influence light behavior |
|
Culet |
The small facet or point at the bottom, if present |
Can affect the appearance when viewed through the table |
All these parts work together to affect how a diamond looks and sparkles. So, you shouldn't judge a diamond by its table or depth percentage alone. Measurements can help you compare diamonds and narrow down your choices, but always look at the stone itself before buying.
Cushion Brilliant, Modified Brilliant, Chunky and Crushed Ice: What's the Difference?

One of the main things to look at when choosing an elongated cushion diamond is its facet style. Facets are the tiny flat surfaces on a diamond that make it sparkle. Their size and arrangement affect how the diamond looks when it catches the light.
While buying an elongated cushion cut diamond, you will come across terms like cushion brilliant, cushion modified brilliant, chunky cushion, and crushed ice.
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Cushion Brilliant: A cushion brilliant has a facet pattern that creates bright flashes of light. Depending on how it is cut, you may see clear and noticeable sparkles when you look at the diamond from above.
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Cushion Modified Brilliant: A cushion modified brilliant has a slightly different facet pattern, often with more smaller facets. This can create lots of tiny flashes of light, sometimes giving the diamond a crushed-ice look.
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Chunky Cushion: A chunky cushion has larger facets that create more noticeable flashes of light. It is often chosen by people who like a vintage-style look.
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Crushed-Ice Cushion: A crushed-ice cushion has many small facets that create lots of tiny sparkles. It gives the diamond a glittery look, almost like crushed pieces of ice.
What Is the Best Length-to-Width Ratio for an Elongated Cushion?
The length-to-width ratio tells you whether a diamond looks long and narrow or short and wide. You can find it by dividing the diamond's length by its width.
Length-to-width ratio = Length ÷ Width
How different ratios can look
The following examples are visual descriptions, not official grading categories or universal recommendations.
|
Illustrative ratio |
General appearance |
|
1.05:1 |
Close to square, with only slight elongation |
|
1.15:1 |
Gently elongated |
|
1.20:1 |
Noticeably rectangular while retaining a balanced cushion appearance |
|
1.25:1 |
A more pronounced elongated outline |
|
1.30:1 |
Visibly longer and more rectangular |
|
1.35:1 |
A distinctly elongated appearance |
|
1.40:1 |
A longer, narrower silhouette |
Does a higher ratio make a diamond look bigger?
A longer diamond does not always look bigger. Two diamonds with the same carat weight can have different lengths and widths. How deep the diamond is also affects how big it looks from the top.
So, don't choose a diamond just because it has a higher length-to-width ratio. First, decide whether you prefer a wider or longer shape. Then compare the actual measurements of the diamonds to find the look you like best.
Table, Depth and Proportions: What Should You Check?
The length-to-width ratio tells you about the diamond's shape, but there are other measurements to look at too. Two of them are table percentage and depth percentage.
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Table percentage: TP tells you how wide the flat top part of the diamond is compared to its total width.
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Depth percentage: DP tells you how deep the diamond is from top to bottom compared to its width.
These numbers help you understand the diamond's shape, but they don't tell you whether it will look beautiful or sparkle well. A diamond may have good measurements on paper but still have dark areas or less sparkle. Another diamond with different measurements may look much better.
So, don't follow strict rules about the perfect table or depth percentage. Use these numbers to compare diamonds, but always check how the actual stone looks in a video or in person before buying.
How Does an Elongated Cushion Diamond Sparkle?
A diamond's sparkle depends on more than just the number of facets it has. The way those facets are arranged also affects how the diamond looks. Three aspects make a diamond sparkle:
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Brilliance: The white light you see coming from the diamond.
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Fire: The small flashes of rainbow colors you see in the diamond.
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Scintillation: The sparkle you see when the diamond or your hand moves.
How much of each of these three you see depends on how the diamond is cut and how its facets are arranged.
What is a bow-tie effect?
A bow-tie effect is a dark area across the middle of a diamond that looks like a bow tie. It is often seen in oval, pear, and marquise diamonds. Some elongated cushion diamonds can also have dark patches in the centre.
Not every elongated cushion has this issue. Before buying, watch a video of the diamond from the top as it moves. A few dark areas are normal, but large dark patches that do not go away can make the diamond look less bright.
How to inspect light performance
When watching a diamond video, check these five things:
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Brightness: Does the whole diamond look bright, or are some areas dull?
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Light and dark areas: Do the bright and dark parts look balanced?
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Sparkle: Does the diamond sparkle as it moves?
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Centre: Is the middle of the diamond bright, or does it have a large dark patch?
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Shape: Do the corners look even and well-shaped?
Also, try to see the diamond in different types of lighting. Bright showroom lights can make almost any diamond look sparkly. Softer, everyday lighting gives you a better idea of how it may look when you wear it regularly.
Carat Weight and Actual Size: What Will the Diamond Look Like?
Carat tells you how much a diamond weighs, not how big it looks. One carat equals 0.20 grams. So, a two-carat diamond weighs twice as much as a one-carat diamond, but it may not look twice as big.
This is because the way a diamond is cut affects how big it looks from the top. A deeper diamond has more weight hidden underneath, while a shallower diamond may look wider from above.
Why Are Measurements More Important Than Carat?
When comparing elongated cushion diamonds, always check these three measurements:
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Length: How long the diamond is.
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Width: How wide the diamond is.
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Depth: How deep the diamond is from top to bottom.
Length and width help you understand how big the diamond will look when worn.
For example, a diamond measuring 7.20 × 6.00 mm has a length-to-width ratio of 1.20:1. Another diamond may have the same ratio but different measurements, making it look bigger or smaller.
So, don't choose a diamond based on carat weight alone. Always check its actual measurements to see how big it looks from the top.
Elongated Cushion vs. Oval: Which Should You Choose?
Both elongated cushion and oval diamonds have a longer shape, but they look different. An oval diamond has a smooth, rounded shape with no corners. Choose an elongated cushion if you like a longer diamond with soft corners. Choose an oval if you prefer a smooth shape without corners.
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Learn More About: Oval Engagement Rings
Elongated Cushion vs. Radiant: What's the Difference?
A radiant cut and an elongated cushion cut can look quite similar because both can have a rectangular shape with cut corners. The main difference is their corners and overall shape. A radiant cut has straight-edged corners.
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Learn More About: Radiant Cut Engagement Ring
Elongated Cushion vs. Emerald Cut
An emerald cut has long, straight facets that create a mirror-like shine. Instead of lots of tiny sparkles, you see wide flashes of light. Inclusions (small marks inside a diamond) can be easier to see in an emerald cut because of its large, open facets.
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Learn More About: Emerald Cut Engagement Ring
Elongated Cushion vs. Square Cushion and Princess Cut
A square cushion cut has a rounded shape and looks almost square. A princess cut is different. It has a square shape with pointed corners with angular look.
Choosing the 4Cs for an Elongated Cushion Diamond
The 4Cs, cut, colour, clarity and carat weight, help you assess diamond quality. They are useful, but they should be considered together rather than treated as four independent scores.
How Much Does an Elongated Cushion Cut Diamond Cost?
The price of an elongated cushion diamond depends on several factors:
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The 4Cs: Its cut, colour, clarity and carat weight.
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Shape and measurements: Its exact length, width, and overall shape.
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Diamond type: Whether it is natural or lab-grown.
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Seller's policies: The seller's return, exchange, and other buying policies.
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Taxes and markups: Extra costs added to the diamond's price.
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Certificate: Which grading laboratory has checked the diamond and issued its certificate.
All these factors can affect the final price, so it's a good idea to compare them before buying.
How to compare prices fairly
When comparing diamond prices, try to compare diamonds with similar features. Look at diamonds with similar carat weights, color, clarity, measurements, and the same type (natural or lab-grown). Then compare how they look and sparkle.
Also, check what you get for the price.
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Does the seller provide a certificate?
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Is there a return or exchange policy?
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Does the price include resizing, cleaning, or a setting warranty?
Don't choose a diamond just because it has a lower price per carat. A cheaper diamond is not always a better deal. Its shape, size, and sparkle should also be worth the price.
How to Choose an Elongated Cushion Diamond: A Practical Buying Guide
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Choose the shape you like: Decide how long you want your diamond to look.
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Choose the sparkle you prefer: Decide whether you like big, bold flashes of light or lots of tiny sparkles (crushed ice).
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Check the diamond's measurements: Ask the seller for the diamond's length, width, and depth in millimetres.
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Watch a video of the diamond: Check if the diamond looks bright, whether it has large dark areas, and how it sparkles when it moves.
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Check its color and clarity: Look at the diamond carefully to see if you can notice any yellow or brown tint or small marks inside it.
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Check the diamond certificate: Ask for the diamond's grading report and check its carat weight, measurements, colour, clarity, polish, and symmetry.
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Check the seller's policies: Before buying, check the seller's return and exchange policies. Also, ask about resizing, cleaning, and the ring's warranty.
Best Engagement Ring Settings for an Elongated Cushion Diamond
An elongated cushion works with several setting styles. The right choice depends on whether you want the outline to stand out, the ring to have more detail, or the diamond to sit closer to the hand.
How Durable Is an Elongated Cushion Diamond?
Diamonds are very hard, but that doesn't mean they cannot get damaged. A strong hit can still cause a diamond to chip or crack. An elongated cushion has rounded corners, which means it doesn't have the sharp points found on shapes like princess cuts. However, it can still get damaged if it is hit hard.
If you plan to wear your ring every day, make sure the diamond is held securely in place. Ask your jeweler how the corners are protected and whether the setting is strong enough for everyday wear.
How to Clean and Care for an Elongated Cushion Engagement Ring
Cleaning your diamond ring regularly helps it stay bright and shiny. Everyday things like soap, lotion, oil, and dust can build up on the diamond and make it look dull. Here is a simple way to clean your ring at home:
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Take a bowl of lukewarm water and add a little mild dish soap.
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Put your ring in the water for a few minutes.
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Gently clean the diamond and ring with a soft brush.
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Rinse it carefully over a bowl so you don't accidentally drop it down the drain.
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Dry it with a soft, clean cloth.
Avoid using toothpaste, strong cleaning products, or rough brushes, as they can damage your ring.
