3 carat cushion cut diamond ring

Ultimate guide to buying a three carat cushion cut diamond


3 carat cushion cut diamonds are a beautiful choice – they sparkle incredibly well, which means that your ring will catch eyes from across any room!

Cushion cuts are one of the most popular shapes for 3 carat diamond rings, which means that there is a good supply of stones available and you should be able to find exactly what you are looking for.

It also means that finding the best 3 carat cushion cut diamond can mean reviewing and rejecting sub-par stones. That’s where this page will help.

3 carat cushion cut diamonds header image

Key takeaway:

There are many factors that affect price and value of a 3 carat cushion cut diamond.

While it is possible to buy from a large retailer like Brilliant Earth, it’s a better idea to work with a specialist in significantly-sized diamonds, who can guide you through the process and ensure you get the most beautiful diamond and pay a fair price.

Our recommendation is Alon at The Diamond Oak, a third generation diamond dealer who puts a huge emphasis on personalised service and finding the right stone for each person.

I recommend you read the testimonials here and then see whether you think that Alon could be a good fit for you

3 carat cushion cut diamond price

As a broad range, the cost of a 3 carat cushion cut diamond (from those available at the time we were researching) can vary from $18,000 to $65,000.

3 carat cushion cut diamond price

To understand how much a 3 carat cushion cut diamond costs, we conducted research across three online diamond aggregation services which collectively have over 1,000,000 diamonds available to choose from, and then checked this against the most widely-accepted list of wholesale diamond prices.

$18,000 to $65,000 is a significant range, and the price you will pay will depend on the color, clarity and the ‘make’ if the stone ie. how well the diamond has been shaped.

With diamonds, you generally get what you pay for, so ‘cheap’ 3 carat cushion cut diamonds will likely have a low-price for a reason – this may be significant inclusions (or ‘flaws’), or it may have poor proportions to reflect light and therefore not sparkle well.

But, when buying a diamond, there is always a balance that needs to be found between the 4Cs and the fifth C – cost. Where that balance lies for you is an individual choice, so it can be worth looking at a few options to where you are comfortable compromising, and where you aren’t.

How much do 3 carat cushion cut diamonds cost?

The table below will give you an idea of how color and clarity affect a 3 carat cushion cut diamond’s price:

ClarityKJIHGFED
SI2$18,000$20,000$30,000$29,000$27,000$34,000$25,000$33,000
SI1$17,000$21,000$27,000$33,00033000$34,000$40,000$36,000
VS2$17,000$28,000$27,000$34,000$40,000$39,000$43,000$44,000
VS1$20,000$24,000$30,000$36,000$44,000$44,000$42,000$51,000
VVS2$19,000$23,000$28,000$41,000$41,000$51,000$43,000$33,000
VVS1$19,000$26,000$24,000$44,000$41,000$45,000$75,000$48,000
IFNoneNoneNone$33,000None$62,000None$65,000
FLNoneNoneNoneNoneNoneNoneNoneNone

If a price doesn’t appear, it means that no diamonds at that spec were available at the time this article was written.

It’s important to recognise that at this carat weight, there can be considerable differences between individual stones with similar specs on paper, so these are very much just a guide.

Factors such as availability at the time you are looking, and then specific of the individual diamond (e.g. the cut quality) will affect the price of any individual stone. However, the prices quoted should be a good guide to understand the relative pricing of different combinations of color and clarity for 3 carat cushion cut diamonds.

3 carat cushion cut diamond size


Cushion cut diamonds deliver the least ‘spread’ shapes of any diamond, which means that for a given carat weight, they appear smaller than many other shapes.

A typical A typical 3 carat cushion cut diamond may be around 8.4mm × 8.4mm × 5.38mm.

Here’s how it looks compared to a 2 carat and a 4 carat:

3 carat cushion cut diamond size comparison

One important thing to understand when you are looking at 3 carat cushion cut diamonds is that carat weight is a measure of weight rather than size.

Carat weight is therefore spread out throughout the volume of the stone ie. length, width and depth.

Depending on the shape of the cushion cut, there can therefore be a significant difference in how large the diamond looks, even at the same carat weight.

This can be most noticeable when comparing square cushion cuts to more rectangular ones. A rectangular cushion cut will often look larger than a square as they tend to be longer and narrower.

Cushion cuts generally look larger than other square cuts like a 3 carat asscher cut diamond ring, or a 3 carat princess cut diamond ring, but can look smaller than elongated shapes like a radiant diamond at 3 carats.

3 carat cushion cut diamond color

As you likely know, diamond color is graded on a GIA-developed scale from D to Z, although most diamonds used in jewelry fall into the D to M range:

3 Color scale

Higher carat weight diamonds tend to show up color more easily than smaller stones, especially in the corners where they sparkle less.

If you want to ensure your diamond doesn’t have a yellow tint, it’s important to try and keep the color as high up the scale as possible.

On the other side of the equation is the effect color has on price.

In most shapes, the price difference between an H color, I color and J color diamond can be significant,

With some diamond shapes, the color grade you choose can be dependant on the color of the ring setting you are going to pair the diamond with. However, 3 carat cushion cuts, I color diamonds are a great balance of whiteness and value for money, whether you are going to choose a white setting (ie. platinum or white gold) or a yellow gold setting.

3 carat cushion cut diamond color recommendation

3 carat cushion cut diamond clarity

Clarity is a measure of the presence of inclusions (or flaws) within a diamond.

The clarity scale runs:

3 diamond Clarity scale

Cushion cuts combine some of the elements of ‘brilliant’ cut diamonds, which means that they are optimised to reflect light back from the bottom of the stone in the form of sparkle, and some elements of the old mine cut diamond. This can mean that inclusions can be difficult to see under the facets, which is a good thing!

A good starting point for 3 carat cushion cut diamond clarity is SI1:

3 carat cushion cut diamond clarity

However, depending on the diamonds that are available at the time you are looking, you may need to increase this to VS2, or even higher, to ensure that the diamond is ‘eye clean’ and no flaws can be seen.

Pictures of 3 carat cushion cut diamond rings on the hand

Higher carat weight rings mean that additional considerations can be needed to be taken into account, depending on the ring setting style chosen.

These images of 3 carat cushion cut diamond rings on the finger will show you how big your ring could actually look.

3 carat cushion cut diamond solitaire ring

Solitaire settings are a great match for cushion cut diamonds – the simple style is a great pairing with the elegance of the diamond.

3 carat cushion diamond ring

A major trend with settings is super slim and petite bands and prongs, which are effective in making the stone itself look larger.

While these can look great, some care does need to be taken with higher carat weights, as an extremely narrow band may not be wide enough to support the stone. It may twist on the finger and become uncomfortable.

If you’re choosing a solitaire setting to match a 3 carat cushion cut, I recommend you choose a band of at least 2.5mm width.

3 carat cushion cut diamond pavé ring

When choosing a pavé or channel setting, there is a big decision to make.

Either can be a great option, but one thing to consider is the color of the side stones.

Small, brilliant cut stones can appear whiter than larger diamonds, which means that even if you do match the color by the color grade, they still may appear whiter.

3 Carat cushion pave diamond ring

In cases like these, especially if you are going a little lower on the color on your center stone, like in the image above, it can be a good idea to work with an expert to ensure that the side stones complement the center stone.

3 carat cushion cut diamond three stone ring

Three stone cushion cut rings look great when paired with almost any other shape as the side stones.

3 carat cushion trilogy diamond ring

Tapered side stones can work particularly well because the side stones make the transition from the long broad side of the diamond to the narrow band more gentle and more elegant.

3 carat cushion cut diamond halo ring

At 3 carats, some may feel that a halo is unnecessary to increase the size and impressiveness of the ring.

However, if you do choose a halo ensuring the side stones are a good match for the center stone is essential, due to their proximity.

3 carat cushion halo diamond ring

Even more so than with a pave or channel setting, working with someone who can color-match the side stones to the center stone is the best way to ensure that they complement each other well.

Best Place To Buy a 3 Carat Cushion Cut Diamond Ring

For smaller carat weights, my recommended retailers are usually James Allen or Brilliant Earth. Both offer a huge selection of stones and high quality service.

They do also both offer 3 carat cushion cut diamonds, and can be a good option if you are confident in making a decision yourself.

However, if you feel that you would like some assistance with the purchase (and at this carat weight and the level of expense involved, that can be a good idea), my recommendation is Alon Mor at The Diamond Oak.

Alon is a third generation diamond dealer who specialises in higher carat weight diamonds and puts a huge emphasis on personalised service and finding the right stone for each person.

I like this review of his service – it’s worth a read to understand just how special buying a diamond can be.

If you’d like to feel as special as the person in this review, I’d recommend getting in touch with Alon. Let him know you heard of him through Ringspo and he will go above and beyond to make the experience even more special.