Skip to contentCodewiser Infotech


Your cart is empty

cushion cut diamond size guide

The Ultimate Guide: Cushion Cut Diamond Sizes

This diamond shape has enchanted admirers for centuries with its mesmerizing brilliance and enduring charm. Its square or rectangular form, adorned with graceful curves, exudes both vintage allure and contemporary sophistication. But let's not just focus on the numbers when choosing the ideal cushion-cut diamond. Instead, let's delve into light reflection and visual fascination.

In this guide, we'll explore the mysteries surrounding cushion-cut diamond sizes. Our aim? To equip you with the knowledge and confidence to select the perfect diamond. So, let's embark on this journey together and explore the world of cushion-cut diamonds!

Exploring the Charm of Cushion-Cut Diamonds

Cushion-cut diamonds have a fascinating history dating back to the 17th century. Their brilliance is not just by chance; it's carefully crafted through the arrangement of 58 facets.

These facets work together to maximize the reflection of light, resulting in a stunning display of sparkle. This unique interplay of light often gives off a soft, romantic glow that captivates the eye.

Now, here's where things get interesting. Unlike round-cut diamonds, where size typically equals brilliance, cushion-cut diamonds offer a delightful surprise. Their allure isn't solely based on carat weight.

It's a beautiful combination of carat weight, proportions, and how well they interact with light. It's this combination that makes cushion-cut diamonds so irresistibly charming.

Why Understanding Diamond Size is Important

Visual Perception: Think about it—what catches your eye when you look at a diamond? It's not just the weight; it's the overall size. Our eyes aren't trained to see weight; they see surface area. So, even though a diamond might have a certain carat weight, how it's cut and proportioned can make it look bigger or smaller.

Take, for example, a well-proportioned diamond. Despite its carat weight, it can appear larger because of its shape and how the light reflects off it. This means you get more sparkle and brilliance for your money.

Exploring the Inner Workings of a Cushion-Cut Diamond

To truly grasp how size affects a cushion-cut diamond, let's take a closer look at its anatomy:

Facets are the small, precisely cut surfaces that determine a diamond's brilliance. Their arrangement and size are crucial in how light behaves within a cushion cut.

Culet: Found at the diamond's bottom, this tiny point can affect both light reflection and the diamond's durability.
Table: This is the flat top surface of the diamond. Its size directly impacts the diamond's brilliance and ability to disperse light.
Pavilion: Situated below the girdle, the pavilion's depth influences how light is reflected within the diamond.
Girdle: This is the thin band encircling the diamond's circumference. Its thickness can affect the diamond's durability and overall appearance.
Crown: Positioned above the girdle, the crown's height and angles significantly impact how light interacts with the diamond, affecting its overall brilliance.

Understanding these key components of a cushion-cut diamond can help you make informed decisions when selecting the perfect stone for your needs.

Enhancing Your Diamond Selection: Exploring Cushion Cut Sizes

When you're delving into the world of cushion-cut diamonds, you're stepping into a realm filled with a variety of sizes, each offering its own enchanting allure.

Square (L/W Ratio: 1.00–1.05)

Opting for this classic square shape means embracing impeccable symmetry and radiating a timeless charm that never goes out of style.

Slightly Rectangular (L/W Ratio: 1.10–1.20)

A subtle elongation to the shape introduces a contemporary flair, giving off a sleek and modern vibe. Not only does this style appear larger for its carat weight, but it also exudes an elegant appeal.

Elongated Rectangles (L/W Ratio: Beyond 1.20)

While some may be drawn to the elongated silhouette, it's essential to note that excessively elongated shapes can compromise the diamond's ability to sparkle and may appear unbalanced to the eye-catching solitaire jewelry.


Cushion MM Size

Cushion carat Weight

1.90 - 2.00 mm 0.04 - 0.05 ct
2.10 - 2.20 mm 0.05 - 0.06 ct
2.30 - 2.40 mm 0.07 - 0.08 ct
2.50 - 2.60 mm 0.09 - 0.10 ct
2.70 - 2.80 mm 0.11 - 0.12 ct
2.90 - 3.00 mm 0.13 - 0.15 ct
3.10 - 3.20 mm 0.16 - 0.18 ct
3.20 - 3.40 mm 0.20 - 0.22 ct
3.50 - 3.60 mm 0.23 - 0.26 ct
3.70 - 3.80 mm 0.28 - 0.31 ct

Visualizing the Magic: Comparing Cushion-Cut Diamond Sizes

Alright, picture this: you've got two cushion-cut diamonds in your hands, both with a similar carat weight. One's got a square shape, while the other leans a bit more towards being rectangular. Even though they weigh the same, that rectangular one might seem bigger because of its elongated form. It's like a little magic trick of perception, playing with size and shape.

Finding Your Perfect Fit: Choosing the Right Size for Your Cushion Cut Diamond

Now, when it comes to picking the perfect size for your cushion-cut diamond, there are a few things to consider:

  • Impact of Diamond Size on Appearance.
  • Going bigger naturally means more brilliance and fire in your diamond.
  • But hey, don't count out the smaller ones! They can still give you that unique sparkle while being friendlier on your wallet.
  • It's not all about the carat weight. Look for a well-proportioned diamond that looks larger than its weight.
  • That's the real secret to getting that wow factor.


Choosing the perfect cushion-cut diamond size is an exciting journey. By understanding the interplay between carat weight, proportions, and light performance, you're empowered to make an informed decision. Remember, the ideal size is not just about numbers; it's about finding a diamond that captures your heart with its brilliance, beauty, and the unique story it tells through its captivating sparkle. You can check size at you home.


Q.1. Can smaller cushion-cut diamonds still sparkle?
Absolutely! Well-cut, smaller diamonds can shine beautifully.

Q.2. Are elongated rectangular cuts a good choice?
Beyond a 1.20 L/W ratio, they may compromise light performance and appear unbalanced.

Q.3. Should I prioritize carat weight or proportions?
Balance is key! Good proportions ensure maximum sparkle, even with a slightly lower carat weight.