Diamonds Size Chart and Comparison by Carat and Diameter

Are you looking for the perfect diamond size? Use our handy chart to find the right size for your occasion. Whether you’re shopping for an engagement ring or want to know your options, we’ve got you covered! (skip straight to the diamonds size chart)

Diamonds Size Chart and Comparison by Carat and Diameter
Photo by Edgar Soto on Unsplash

In this post, we’ll teach you everything you need to know about diamond sizes and give you a size chart for reference.

Jump right into the Frequently Asked Questions

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Table of Content of Diamonds

Diamonds size chart comparison

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It can be difficult to understand the difference between diamond sizes, especially when you’re looking at them online or in a catalog. That’s why we’ve created a comprehensive size chart to help you visualize the different diameters and how they compare.

Diamonds size chart by carat

Convert easily the Diamond weight in carat into mm with the Diamonds conversion table below

Round Size Round Carat WeightRound Size Round Carat Weight
( mm )( inches ) ( mm )( inches ) 
0.80.0310.0025 ct.7.000.27511.30 ct.
10.0390.005 ct.7.300.286891.50 ct.
1.100.0430.0067 ct.7.500.294751.67 ct.
1.20.0470.009 ct.7.750.3045751.75 ct.
1.250.0490.01 ct.8.000.31442.00 ct.
1.30.0510.01 ct.8.250.3242252.11 ct.
1.50.0590.015 ct.8.500.334052.43 ct.
1.750.0690.02 ct.8.700.341912.50 ct.
1.80.0710.025 ct.9.000.35372.75 ct.
20.0790.03 ct.9.100.357633.00 ct.
2.20.0860.04 ct.9.500.373353.35 ct.
2.50.0980.06 ct.9.750.3831753.61 ct.
2.750.1080.08 ct.10.000.3933.87 ct.
30.1180.10 ct.10.250.4028254.16 ct.
3.250.1280.14 ct.10.500.412654.41 ct.
3.50.1380.17 ct.10.750.4224754.57 ct.
3.750.1470.21 ct.11.000.43234.91 ct.
40.1570.25 ct.11.250.4421255.49 ct.
4.250.1670.28 ct.11.500.451955.85 ct.
4.500.1770.36 ct.12.000.47166.84 ct.
4.750.1870.44 ct.12.250.4814257.26 ct.
5.000.1970.50 ct.12.500.491257.36 ct.
5.250.2060.56 ct.12.750.5010757.52 ct.
5.500.2160.66 ct.13.000.51098.51 ct.
5.750.2260.75 ct.13.500.530559.53 ct.
6.000.2360.84 ct.14.000.550210.49 ct.
6.250.2460.93 ct.15.000.589512.89 ct.
6.500.2551.00 ct.16.000.628816.06 ct.
6.800.2671.25 ct.   

How to know the size of diamonds

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The size of a diamond is usually measured in millimeters (mm). The size of the diamond is determined by the diameter of the diamond, which is the length of a straight line measured through the center of the diamond from one side to the other.

What is Carat and how to convert to grams

Some people also use the term “carat weight” to describe the size of a diamond.

Carat weight measures how much a diamond weighs and is typically used when pricing diamonds. One carat is equal to 200 milligrams or 0.2 grams.

When measuring the size of a diamond, you should use a caliper or jeweler’s scale to get an accurate reading. You can also use an online diamond size calculator to help determine your diamond’s size.

diamonds size chart
Image Source: Chine Magazine

Expert note: Remember that the size and carat weight of a diamond are not the same thing. A diamond’s measurements are referred to as its size (i.e., height and weight). The carat weight, on the other hand, is just the diamond’s weight in grams. For this reason, you must constantly enquire about the diamond’s dimensions in addition to its carat weight.

What is the difference between the actual size and the minimum size?

When it comes to diamond sizes, there are two terms you need to be familiar with: actual size and minimum size.

The actual size is the size of the diamond as it is measured in millimeters. Minimum size, on the other hand, is the smallest allowable size for a diamond according to its quality grading.

So what’s the difference? The actual size is the size of the diamond that you will receive. The minimum size is the smallest diamond that a jeweler will quality for purchase.

Remember that not every diamond will be available in every size because every diamond is unique. Speak with your jeweler to find out which sizes are available for the diamonds you’re interested in.

Check out this Diamond Size Comparison Guide (video)

CapeDiamonds Diamond size chart by CapeDiamonds

Diamonds size chart and price

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It’s important to keep in mind that diamond size does not equate to price. A smaller diamond can often be more expensive than a larger one, and vice versa.

Here is a general guide to diamond sizes and their corresponding prices:

SizePrice indicator
0.1 ct$100
0.2 ct$200
0.3 ct$300
0.4 ct$400
0.5 ct$500
0.6 ct$600
0.7 ct$700
0.8 ct$800
0.9 ct$900
1.0 ct and upFrom $1200

You might be wondering, “What is the difference between a diamond size and diamond weight?” The size of a diamond is measured in millimeters, while the weight is measured in carats.

Remember that a larger diamond doesn’t always mean it will be more brilliant. It’s all about how well the diamond has been cut – how well the angles and proportions have been considered to bring out the most brilliance.

A good way to compare diamonds is using the diamond size chart. This will give you an idea of how a certain carat weight looks when compared to another.

Rounded Diamond weight and sizing
Rounded Diamond weight and sizing

Diamond size chart baguette

Baguette diamonds are usually measured in millimeters and typically range from 2.5 mm to 8 mm in size. Keep in mind that the size of a baguette diamond can also be affected by its cut, so it’s important to consult with a qualified jeweler to get an accurate measurement.

Diamonds size on a hand explained (video)

Diamond Size Engagement Ring Comparison On Hand (0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 Carat) by ZCOVA

Frequently Asked Questions

What size is a 1-carat diamond?

A 1-carat diamond is typically around 6.5 mm wide. It can range from slightly less than 6 mm to slightly more than 7 mm but is most commonly around 6.5 mm. Remember that a 1-carat diamond is not always exactly 6.5 mm – it can vary slightly depending on the diamond’s cut, clarity, and other factors.

What size of the diamond is good?

So, what size of the diamond is good? This question doesn’t have a definitive answer because it varies from person to person. Some people might prefer a smaller diamond, while others want something larger and more extravagant.

That being said, we recommend anything between 0.5 and 2 carats for the average woman. This gives you a wide range of options to choose from and will ensure that you find something that fits your style and budget.

If you’re looking for something outside of this range, or if you’re unsure of what size would be best for you, our team is more than happy to help. We want you to find the perfect diamond to make you feel confident and beautiful!

Is a 2-carat ring big?

Regarding diamond sizes, carat weight is the primary factor determining how large a diamond appears. And while a 2-carat ring may sound pretty big, it’s actually on the smaller side.

For comparison, the average engagement ring size is about 1.5 carats. So if you’re looking for something a little more impressive, you may want to consider something with a larger carat weight.

Of course, many other factors to consider when choosing a diamond size, such as the cut, color, and clarity. So be sure to weigh all your options before making a final decision.

Is a 0.5-carat diamond too small?

No, a 0.5-carat diamond is not too small. It’s the most popular diamond size sold today. It’s perfect for those who want a smaller, more affordable diamond without sacrificing quality or beauty.

A 0.5-carat diamond is also great for everyday wear and can be worn in various settings. Whether you’re looking for a solitaire ring or something more intricate, a 0.5-carat diamond is sure to fit the bill.

Diamonds size on a hand

Diamonds mostly end up in rings, like an engagement ring, so it’s important to imagine the size of the diamond on your finger, mostly the ring finger.

Diamond Carat Weight and size on a woman's hand
Diamond Carat Weight and size on a woman’s hand

Related: Diamond stud earring size chart

Diamonds size vs Ring size

How big should a diamond be for my finger? To answer this question, you must know the precise ring size in order to determine how big a diamond ring will fit on a finger. Women’s ring sizes in the US range from 3 to 9, with 6.5 being the average size. A finger that is 17mm (or 16.9 mm, to be more precise) in width fits within this standard size.

There are various methods for determining ring sizes. You can use a string, a ruler or measuring tape, or you can buy a ring sizer to do it for you. Knowing this is crucial since the size of the diamond on the finger depends significantly on the relationship between the ring size and the diamond’s carat weight.

Which diamond is best?

So, you’ve found the perfect diamond – but which one is it? With so many different shapes and sizes to choose from, it can be tough to decide which one is right for you.

We recommend choosing the diamond that speaks to you. If you love the look of a round brilliant diamond, go for it! If you’re drawn to the elegance of an oval diamond, go for that. The most important thing is that you love it.

Diamond shapes

What’s the most popular diamond shape? The most popular shape of a diamond is a round diamond. Below you see other popular diamond shapes

  • Princess
  • Cushion
  • Oval
  • Emerald
  • Heart
  • Pear
  • Marquise
  • Asscher
  • Radiant
Different Diamond shapes
Different Diamond shapes

Diamond weight

Another thing to consider is the carat weight. Larger diamonds are often more expensive but are more impressive and eye-catching. If you’re looking for something flashy and show-stopping, go for larger carat weight. If you’re looking for something more delicate and understated, go for a smaller carat weight.


Whether you are in the market for a diamond or not, it is always interesting to know about the various sizes and what they mean. Hopefully, this guide has answered all of your questions about diamond sizes as well as give you a better understanding of how sizing works. Keep in mind that no two diamonds are exactly alike, so you may find that you prefer one size over another. And, if you are ever in doubt about the size of a diamond, be sure to take it to a qualified jeweler for verification.

We hope this size chart will help make your shopping experience easier and more informative! Ask any questions in the comments section.

Picture in this post is by Edgar Soto on Unsplash

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