When you’re shopping for a diamond, the first thing you probably look at is the diamond carat weight. A higher carat weight means a bigger diamond, right? While that may be true, it’s not the whole story. In this blog post, we’ll break down everything you need to know about how to shop for a diamond by carat weight.

What is a Diamond Carat and Diamond Weight?

Diamond carat is simply how a diamond is measured and is the unit used to indicate how much a diamond weighs. One carat is equal to 200 milligrams or 0.2 grams. When you’re looking at the carat of a diamond, it will be expressed as “ct.” or “carats.”

The word “carat” is derived from the Greek word for the carob tree, which was once used as a unit of measure for small objects. Larger diamonds are rarer and more valuable than smaller ones, so they command a higher price per carat. For example, a one-carat diamond will cost more than twice as much as a half-carat diamond. However, two diamonds of the same carat weight can have very different values depending on other factors such as clarity and color. So when it comes to choosing a diamond, it’s important to consider all of the factors that affect value.

Reading the Carat Numbers

When you’re looking at diamonds, you may notice that they’re often described with two numbers in regard to their carat weight. For example, you may see a 1.01 ct. diamond or even a 1.00 ct. These two numbers are actually expressing different things. The first number indicates the total weight of the stone and the second number is what’s called the decimal place carat value or DGTP (sometimes also referred to as points). So, in our examples above, the 1st number (1) would represent 1 full carat and then 0 decimal place carats for a total of 1 full carat or 100 points. Sometimes, you may see diamonds listed without any decimal place such as 2 ct., 3 ct., etc.—this would mean that there are no decimal place values and what you see is what you get in terms of total carats.

Determining a Diamond’s Carat Weight

When evaluating a diamond, gemologists will use a special tool called a caliper to determine its carat weight. The caliper is placed around the diamond, and the gemologist will then read the carat weight off of the caliper’s scale. It is important to have an accurate measurement of the carat weight when purchasing a diamond, as it is one of the main factors that determines its value.

The Effect of Carat Weight on the Diamond’s Price

Carat weight is one of the most important factors in determining diamond price. The heavier the diamond, the more valuable it is. This is because large diamonds are rarer than small diamonds. In addition, carat weight also affects the diamond’s physical appearance. A one-carat diamond will look larger than a half-carat diamond, for example. Therefore, when choosing a diamond, it is important to decide how much carat weight you want. Keep in mind that the price of a diamond increases exponentially as the carat weight increases. So, if you’re on a budget, you may want to opt for a lower diamond-carat weight. However, if you’re looking for a truly stunning diamond, then you’ll need to be prepared to pay a high price for it.

The Effect of Carat Weight on the Diamond’s Appearance

Carat weight is one of the four Cs used to determine a diamond’s quality, and it is perhaps the most important factor when it comes to determining a stone’s value. When it comes to assessing a diamond’s appearance, carat weight is directly related to a stone’s size. Generally speaking, the larger the diamond, the more valuable it will be. However, two diamonds of equal carat weight can have very different appearances depending on their cut, color, and clarity.

For example, a diamond with a poor cut will appear dull and lifeless, regardless of its size. In contrast, a diamond with an excellent cut will sparkle and shine, even if it is small in size. Therefore, when it comes to judging a diamond’s beauty, carat weight is just one of many factors to consider.

The Difference Between Carat Weight and Carat Size

Carat weight and carat size are often confused, but they are actually two different things. Carat weight is a measure of how much a diamond weighs, and is represented by a number followed by the letter ‘ct’. For example, a one-carat diamond would be written as 1.00ct. Carat size, on the other hand, is a measure of the physical size of the diamond and is represented by the diameter in millimeters. So, a one-carat diamond could have a carat size of 6.5mm or 7.0mm. As a general rule, the larger the carat weight, the larger the carat size – but this is not always the case. For example, an oval-shaped diamond will appear larger than a round diamond of the same carat weight. When shopping for diamonds, it is important to keep in mind both the carat weight and the carat size to ensure you are getting the right stone for your needs.

The Average Diamond Carats of an Engagement Ring

The average engagement ring is usually between 1 and 2 carats. However, the size of the ring depends on a variety of factors, including the budget of the person buying the ring and the personal preferences of the couple. In general, engagement rings range in size from 0.5 carats to 5 carats, although some engagement rings can be even larger. Carat weight is just one factor to consider when choosing an engagement ring, but it is often an important factor for couples.

Most Popular Carat Weight for a Diamond Engagement Ring

The most popular carat weight for engagement rings is one carat. However, the average cost of a one-carat engagement ring is $5,598, which can be out of reach for many couples. For those on a budget, half-carat diamonds may be a better option. It should be noted that carat weight is not the only factor that determines the cost of an engagement ring. The type of metal, the quality of the diamond, and other factors also play a role in pricing.

Comparison of the Carat Weight of a Diamond to Other Gemstones

The carat weight of a diamond is often used to determine its value. But how does the carat weight of a diamond compare to other gemstones? The answer depends on several factors, including the density of the stone and the size of the gemstone. For example, a one-carat diamond is much smaller than a one-carat sapphire. This is because diamonds are much denser than sapphires. As a result, a one-carat diamond will weigh more than a one-carat sapphire. However, when it comes to value, size is not the only factor that matters. The quality of the stone also plays a role in determining value. So, while carat weight is an important consideration, it is not the only factor to consider when judging the value of a gemstone.


When shopping for diamonds, don’t just focus on the size of the stone—look at other factors such as color, cut, and clarity as well. That said, size does matter and has an impact on both how much your diamond costs and how it looks. Work with your jeweler to find the best option for you based on your budget and desired look!

FAQ – Diamond by Carat Weight

What is the price & cost of a 1-carat diamond?

We estimate that a 1-carat diamond can cost anything between £6,000 and £10,000.

What are “magic sizes”?

Some weights are considered “magic sizes” – half carat, three-quarter carat, and one carat.

When it comes to these diamonds, the “magic sizes” are those that are just big enough to be impressive, but not so large that they are difficult to find. The most popular magic size is 1 carat, which is about the size of a small pea.

What does “TW” mean?

“TW” is an abbreviation for the total carat weight. Total carat weight represents the total weight of all diamonds or other gemstones in a piece of jewelry when more than one stone is used. Sets of jewelry, or jewelry sold in pairs, are typically sold using total carat weight.

Sign in
Cart (0)

No products in the cart. No products in the cart.