4 Carat Radiant Cut Diamond Ring

Ultimate Guide To Buying A Four Carat Radiant Diamond

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

Radiant cuts are one of the most popular shapes for 4 carat diamond engagement 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 4 carat radiant cut diamond can mean reviewing and rejecting sub-par stones. That’s where this page will help.

carat radiant diamonds header image

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Key takeaway:

There are many factors that affect price and value of a 4 carat radiant cut diamond and no two radiants are the same, even if the specs on the certificate indicate that they should be.

Why working with a diamond specialist makes sense for such a significant investment

While smaller diamonds may be virtually interchangeable, at this carat weight there can be a significant different between two diamonds that look similar on paper.

Their specs may be similar but they are worth very different values.

A diamond specialist will take the time to understand what you are looking for, present several options (often sourced through personal connections and otherwise inaccessible) and guide you towards the diamond which is the absolute best fit for you.

Learn About The Diamond Oak

4 carat radiant cut diamond price

As a broad range, the cost of a 4 radiant cut diamond (from those available at the time we were researching) can vary from $34,000 to $92,000.

4 carat radiant diamond price

To understand how much a 4 carat radiant 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.

It should be noted that VVS2 clarity was the highest clarity we could find across any of these retailers when we were researching. It’s likely that a 4 carat radiant cut diamond with FL or IF clarity would be priced around $150,000, if you were able to find one.

$34,000 to $92,000 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’ 4 carat radiant 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 4 carat radiant cut diamonds cost?

The table below will give you an idea of how color and clarity affect a 4 carat radiant cut diamond’s price:


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 4 carat radiant cut diamonds.

4 carat radiant cut diamond size

Radiant 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 4 carat radiant cut diamond may be around 9.17mm × 9.17mm × 5.87mm.

Here’s how it looks compared to a 3 carat and a 5 carat:

4 carat radiant diamond size comparison

One important thing to understand when you are looking at 4 carat radiant 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 radiant 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 radiant cuts to more rectangular ones. A square radiant cut can ‘face up’ at a similar size to other square shapes like an asscher cut 4 carat diamond ring or a princess cut 4 carat diamond ring.

A rectangular radiant cut will often look larger than a square as they tend to be longer and narrower, and the often compare favourably to a cushion cut 4 carat diamond ring.

4 carat radiant 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:

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 a 4 carat princess cut diamond, the color grade you choose can be dependant on the color of the ring setting you are going to pair the diamond with. If you are choosing a white colored setting (platinum or white gold), then I color delivers a good balance of white appearance and value.

However, if you are choosing a yellow gold setting, then you can reduce the color of your diamond to K without it looking yellow, as it will still look white compared to the warm tones of the setting.

4 carat radiant diamond color recommendation

4 carat radiant cut diamond clarity

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

The clarity scale runs:

GIA diamond Clarity scale

Radiant cut diamonds are a ‘brilliant’ cut diamonds, which means that they are optimised to reflect light back from the bottom of the stone in the form of sparkle. This can mean that inclusions can be difficult to see under the facets, which is a good thing!

A good starting point for 4 carat radiant cut diamond clarity is SI1:

4 carat radiant 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 4 carat radiant 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 4 carat radiant cut diamond rings on the finger will show you how big your ring could actually look.

4 carat radiant 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.

4 carat radiant 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.

4 carat radiant cut diamond halo settings

At 4 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.

carat radiant 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 4 Carat Radiant Cut Diamond Ring

Why I recommend Alon at The Diamond Oak

I’ve worked with Alon for over five years, helping people who are looking to buy significant diamonds, as well as those who are selling high quality jewelry.

Through that time, I have seen the exceptional service that Alon delivers to each and every client he works with.

I like this review – it sums up how special working with someone who truly cares can be.

If you are seriously considering making a purchase and want to ensure you get a beautiful diamond at a fair price, I recommend you book in a discovery call with Alon: