Summary in a few lines:

A lot of people look for “heavier” diamonds (i.e. higher carat) because they want their diamonds to be special, visible, and sparkling.

Truth is, diamond sparkle isn’t only factored by diamond carat (and size), since other factors play a big role on this (mainly & most importantly the cut).

You can find some stunning diamonds with kind of lower carat (0.8) like this one, while if you search only for a larger diamond (still having some other good factors), you might end up getting a diamond like this 1.5 carat, but simply doesn’t worth a dime (both diamonds share same clarity, polish, symmetry, girdle, but the 1.5 has v. good cut vs excellent for the 0.8).

It’s worth mentioning that size differs for the same carat depending on diamond shape.

Let’s start with the basics…

What is Diamond Carat?

Maybe the statement above “2 carat isn’t double the size of 1 carat diamond” got your attention, so let’s take a quick look on what is a diamond carat and how it affects size.

Diamond carat is a weight unit as stated before, and it’s equal to 200 milligram, or 0.2 of a gram, you might think that 0.2 of a gram is so small & tiny, but truth is, it’s not small, at all!

The images we just saw are for 1 carat diamonds on a very “typical” finger size, as you see, they are quite visible and looks just perfect for her hand.

Now when you go twice that “weight”, remember that you’re seeing the diamond from the top mainly, and a lot of weight is filling the other parts of the diamond (depth), looking at this image gives us a bit more clarity:

Diamond Parts

The most visible parts of a diamond are table & crown, and doubling its carat as you see will have the weight distributed over the different parts, think of it like a 10 pound ball at the gym, and compare it to a 20 pound, is the 20 double the size?

1 Carat Actual Size on Hand Fingers for Different Shapes

You probably have many questions already about how 1 carat diamonds look like in real hands.

Well, luckily, many online stores have provided great visualization tools to reflect how different shapes & carat sizes appear on hand. So, no need to worry about that!

And for the diamond size, it is usually determined by its weight, which is called carat, or as some people mistakenly type it karat, which is actually the gold purity (the confusion came since some countries like UK use carat for gold karat).

And by the way, a 2 carat ring doesn’t necessary mean that it’s double the size of a 1 carat.

As you can see from the photos here (credit: James Allen preview feature); these are all 1 carat diamonds, you can see how they actually look on average hand in Round, Heart, Princess, and Oval shapes:

1 carat 4 shapes

For clearer images of the 4 shapes, here are the original Round diamond, the Heart one, the Princess, and the Oval.

Diamond Carat is NOT Gold Karat! Not Even Close

While this is not a common misconception, we have seen the confusion from some of our readers on multiple occasions; which’s why we’re setting some facts straight..

Gold purity is measured by karat (or in the UK it’s Carat, and that’s probably the reason for the confusion), it reflects the concentration of gold in the item; since not all gold jewelry is 100% made of gold.

So for example, when they say this gold ring is 24 Karat, it means that 24 out of 24 parts of this ring is made of gold (which is 100%), while in 18 karat, it’s ​1824 which is 75% pure gold.

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Carat in diamonds has nothing to do with “purity” of a diamond. It’s simply a measuring unit for the weight/size of a diamond.

1 vs. 2 Carat Round Diamond Actual Size on Hand

Here is a visual comparison between 1 & 2 carat round diamonds (being the most popular shape) actual sizes on hand:

1 vs 2 carat actual size on hand - round

Indeed it’s larger, but in terms of dimensions, the 1 carat diamond has Length of 6.38mm, and Width 6.35, while the 2 carat L is 8.21 and W of 8.27.

These measurements are critical to understand how length, width, and depth play a huge role defining how diamonds reflect light.

The good thing is, you don’t need to go high carat to get an excellent diamond, and this is what our post about!

But keep in mind, 2 carat diamond is just larger than 1 carat diamond, not necessarily better!

Here is an awful 2 carat diamond listed for $14.2k, while this stunning 1 carat diamond is listed for $7.6k, and if you ask me (or actually anyone), I will tell you to get the 1 carat diamond!

Wondering why that 1 carat is more expensive than the average price of 1 carat diamond?

That’s because it has perfect internal symmetry and proportions, this collection on James Allen is called True Hearts Cut.

827X827 THLD23

What is Diamond Carat Chart?

Diamond Carat Chart is a system of measuring the weight of a diamond particle, how it looks, and how large or small it is!

The chart is one of the factors considered when choosing a diamond piece because it’s one of the main characteristics of diamonds (4Cs).

Now that we have established that diamonds come in different shapes & sizes (it’s very common to refer to shapes as cuts by the way), do you know that shape & carat are very correlative? Why?

Because every diamond shape will affect how the diamond looks (even with similar carat).

For instance, let’s take a 1 carat princess-shaped diamond. It’d absolutely look different (in size) from an oval-shaped diamond as we saw in the image above.

Another fun fact: Do you know that many shapes look larger “in size” than round shapes? Check the table below.

But regardless, round is on most demand, why is that?

Because diamond beauty is mainly affected by how much light does that diamond reflect, and in terms of shape, the round brilliant cut is known to be the best here, i.e. its ability to reflect light exceeds other shapes.

That’s why carat is the last C among the 4Cs in order of importance!

Diamond Measurements & Size Chart per Carat

Diamond Size Measurement Carat Chart

Diamonds Actual Size on Hand for Common Carat

Now that you’re aware of the various factors to be considered when buying that diamond ring, you probably have a good idea of what you want to get your special lady! The final step is to find a ring that fits perfectly, and you’re ready to go!

Since round shape is known to be the most popular shape of all time, princess cut comes second place, we will be showing the actual sizes for these shapes on hands.

Note: All images are taken from James Allen.

1/2 (half) Carat Diamond Actual Size on Fingers

On an average hand, here is how a 0.5 carat diamond looks like:

0.5 Carat Round & Princess actual size on hand

1 Carat Diamond Actual Size on Fingers

People consider the 1-carat diamond to be the “benchmark” for diamond sizes.

Here is how it looks on hand:

1 Carat Round & Princess actual size on hand

JamesAllen Promo

1.5 Carat Diamond Actual Size on Fingers

1.5 carat is also a great choice for a lot of people, it stands out effortlessly! Here are two images for the actual size of 1.5 carat diamonds on hand:

1.5 Carat Round & Princess actual size on hand

2 Carat Diamond Actual Size on Fingers

Going a bit “large”? Be careful with higher carat, not all hands are equal in size, some diamonds might appear a bit large on “tiny” hands, so if you’re getting such a high carat, here is how it looks on “average” hand:

2 Carat Round & Princess actual size on hand

3 Carat Diamond Actual Size on Fingers

Going wild? Make sure they don’t look very large on her hands, here is how 3 carat diamonds look:

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3 Carat round princess diamond real size.

Better Cut or Higher Carat?

Look at this image, it shows how the different cuts for a round diamond also have different sizes; taking into consideration that these 3 diamonds all of the same carat:

Diamond Cut for Rings

You can easily spot the diamond with the largest crown (the shallow one), and we hope you’re not even thinking about getting it, right?

Despite the fact that it looks bigger than other cuts, it sure has a very poor light reflection! An Excellent cut is what actually gives the diamond this sparkle and undeniable beauty!

Diamond excellent cut is way more important that getting a higher carat, so if you ask us, what is better: 1 carat excellent cut or 2 carat good cut? Definitely go with the 1 carat, no doubt about that. 

Feel free to read our Cut Chart Article that will show in detail how each cut grade reflects light.

Blue Nile Ring 2

Buying Tip: Our Recommendation Based on Diamond Size Chart

On your hunt to find the perfect gem, whether you prefer the local stores, or even better (and way easier) buying diamonds online from some reputable names like James Allen & Blue Nile.

Always allocate the majority of your budget to secure an excellent cut, then start giving attention to Clarity, Color, and Carat.

For clarity, it’s recommended to start your search from SI1 grade as it’s eye-clean almost always.

If you’re uncertain about which carat range to choose from, it’s good to know that most people go with something a little under 1 carat for budgetary reasons.

Our last advice would be: Don’t go for the obvious!

Meaning? The demand is too high for the “1 carat” and the “1.5 carats”. We’d recommend that you go a bit lower on the carat to get a better price. Here’s an example:

If you want a diamond with 1 carat, go for the diamonds that are between 0.9 & 0.95 carats, it’s almost impossible to distinguish between such carat because their diameter is almost identical to the naked eye!

The same goes for 1.5 carats as well, go a little below, and you’ll find a better price per carat. These carats (0.9 – 0.95 & 1.4 – 1.45) demand is much lower than the known grades (1 & 1.5 respectively), and vendors use that to their advantage!


Still not sure where to buy your diamond?

We always recommend shopping diamonds online and created a Full guide to shop diamonds like a Pro.

Among online retailers, here are our favorite stores (click their logo to visit store):

1) James Allen: Our favorite online store, best diamond imaging technology available today, comes with the largest collection with more than half a million loose diamonds.

Latest JA Logo2) Blue Nile: Widest collection of loose diamonds of all sizes, great imaging technology for most of their  inventory (hundreds of thousands of diamonds), great customer support.

Blue Nile Latest Logo

3) Whiteflash: Home Of A CUT ABOVE® Super Ideal Diamonds, they stand out from the crowd by offering premium diamonds cuts, tailored to those who love the details, at great prices too.

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About the Author

Emily Stone

Emily Stone is a talented professional in the diamond industry, known for her expertise and passion. With a keen eye for detail and a deep appreciation for the beauty of diamonds, Emily has become a trusted authority.

Driven by her lifelong fascination with gemstones, Emily has dedicated her career to understanding the intricacies of diamonds. With years of experience in diamond sourcing and grading, she possesses a comprehensive knowledge that sets her apart.

Emily's impeccable taste and ability to curate extraordinary diamond pieces have made her a sought-after consultant. Her commitment to providing personalized guidance has earned her a loyal clientele.

Through this website, Emily shares her insights and educates others, helping them navigate the world of diamonds with confidence. With her expertise and unwavering passion, Emily Stone continues to make a mark in the captivating realm of diamonds.