9 Carat Radiant Cut Diamond Ring

Ultimate Guide To Buying A Nine Carat Radiant Diamond


9 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 9 carat diamonds, 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 9 carat radiant cut diamond can mean reviewing and rejecting sub-par stones. That’s where this page will help.

9 carat radiant diamonds header image

How much do 9 carat radiant cut diamonds cost?

9 carat radiant cut diamonds are extremely rare, so the price of an individual stone will depend on the 4 C quality factors, as well as how well the stone has been shaped.

It’s likely that the price could range from $150,000 for a diamond with low color and clarity (e.g. SI2 clarity, K color) all the way to around $800,000 for a diamond with high colour and clarity (e.g. FL clarity, D color)

It’s important to recognise that at this carat weight, there can be considerable differences between individual stones with similar specs on paper, so each stone really does need to be assessed on its own basis.

9 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 9 carat radiant cut diamond may be around 12.02mm × 12.02mm × 7.69mm.

Here’s how it looks compared to a 8 carat and an 10 carat:

9 carat radiant diamond size comparison

One important thing to understand when you are looking at 9 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 9 carat diamond ring or a princess cut 9 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 9 carat diamond ring.

9 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:

9 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 9 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 J without it looking yellow, as it will still look white compared to the warm tones of the setting.

9 carat radiant diamond color recommendation

9 carat radiant cut diamond clarity

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

The clarity scale runs:

9 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 9 carat radiant cut diamond clarity is SI1:

9 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 9 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 9 carat radiant cut diamond rings on the finger will show you how big your ring could actually look.

9 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.

9 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.

9 carat radiant cut diamond three stone ring

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

9 carat radiant three stone 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.

Best Place To Buy a 9 Carat Radiant 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.

Neither retailer offers 9 carat diamonds, however, so my strong recommendation is to find a reputable diamond dealer who can assist you with sourcing your diamond. 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.