Buy Fine Diamonds : A Comprehensive Guide to Diamond Carat Weight

Buy Fine Diamonds : A Comprehensive Guide to Diamond Carat Weight

When it comes to buying fine diamonds, understanding the various aspects of diamond quality is essential. Among the famous "4Cs" - cut, color, clarity, and carat weight - the carat weight is often misunderstood. In this comprehensive guide, we will delve into the intricacies of diamond carat weight, debunk common misconceptions, and provide valuable insights to help you make informed decisions when purchasing diamonds. At Amada Diamonds, we pride ourselves on offering the best selection of lab-grown diamonds, impeccable craftsmanship, and outstanding customer service. Let's explore the fascinating world of diamond carat weight together!

All About Diamond Carat Weight

The term "carat" refers to the weight of a diamond or gemstone, not its size. Interestingly, the term "carat" originated from the carob seed, which ancient traders used as a standard for weighing precious gems. It is crucial to differentiate "carat" from "karat," which measures the purity of gold and platinum. Carat weight is measured in milligrams, and one carat is equal to 200 milligrams. Additionally, carat weight is often expressed in points, where one carat is equivalent to 100 points. For example, a 0.52 carat diamond can also be referred to as a 52-point diamond.

The relationship between carat weight and size can vary depending on the diamond's cut. Two diamonds with the same carat weight may have different millimeter sizes. It is important to note that carat weight alone does not determine a diamond's value or appearance. Other factors, such as cut, color, and clarity, also play significant roles in assessing a diamond's quality.

Understanding Diamond Carat Size Chart

To visualize the approximate sizes of different diamond carat weights, refer to the diamond carat size chart below. Please keep in mind that this chart specifically applies to round diamonds. Other diamond shapes may appear larger or smaller for the same carat weight.

diamond size chart

Lab-Grown Diamonds and Carat Weight

Lab-grown diamonds possess the same mineral content as mined diamonds, resulting in identical carat weight measurements. While lab-grown diamonds can be produced in various carat weights, the most commonly available range falls between 0.30 carat and 6.00 carats. At Amada Diamonds, we offer a wide selection of lab-grown diamonds, ensuring you find the perfect carat weight for your desired piece of jewelry.

Frequently Asked Questions

Can I Pair Two Carat Diamonds for Earrings?

While it is technically possible to pair two diamonds of the same carat weight, it is not recommended. When creating a pair of earrings, it is crucial to consider matching size, carat weight, colour, and clarity. Even diamonds with the same carat weight can vary in size, which becomes noticeable when mounted. To ensure a harmonious and balanced appearance, it is best to select earrings with diamonds that are carefully matched in all aspects.

Understanding Total Carat Weight for Diamond Studs

At Amada Diamonds, and many other jewellers, diamond studs are typically labeled with their total carat weight (CTTW). For instance, a pair of 1CT (or 1CTTW) diamond studs does not mean each earring contains a one-carat diamond. Instead, the pair consists of two half-carat diamonds that match each other in size, colour, and clarity. This approach ensures a perfect pair of earrings that exude elegance and symmetry.

Do Different Diamond Shapes Appear Bigger?

Certain fancy diamond shapes, such as ovals or pears, may appear slightly larger than round diamonds of the same carat weight. However, it is essential to consider the other 3Cs - cut, colour, and clarity - when evaluating diamond appearance. Each diamond shape has its unique characteristics, and shapes like emerald can offer a distinct look compared to the classic round brilliant shape.

Determining the Weight of a Diamond Carat

The weight of one carat is equivalent to 200 milligrams, 0.2 grams, or 0.007 ounces. When assessing a diamond's carat weight, it is necessary to measure the actual weight rather than relying solely on visual estimations. Even experienced jewellers may have difficulty accurately estimating a diamond's carat weight when the stone is mounted.

What is the Most Common Carat Weight for Center Stones?

According to a prominent wedding planning and resource website, the majority of engagement rings sold in the U.K. in 2019 featured a center diamond between 1 and 2 carats. This range is a popular choice among couples seeking timeless elegance and brilliance for their engagement rings.

How to Determine the Size of a One Carat Diamond?

Due to variations in cut quality, the size of a one-carat diamond can differ among individual stones. However, a well-proportioned one-carat diamond generally measures approximately 6.5mm. It is important to consider the overall dimensions and cut of a diamond to accurately assess its visual size.

Understanding the Price of a One Carat Diamond

The price of a one-carat diamond varies based on multiple factors, including cut, color, clarity, and overall quality. Mined diamonds can range from as low as £500 for poor-quality stones to over £10,000 for exceptional diamonds with excellent color and clarity. Lab-grown diamonds, on the other hand, generally offer a more affordable alternative, with prices around 25-40% lower compared to mined diamonds of similar quality. It is crucial to be cautious when encountering deep discounts, as the adage "you get what you pay for" still rings true in the diamond industry.

The Most Common Center Stone Sizes

Considering the relationship between physical size and carat weight, center diamonds between 1 and 2 carats are prevalent in engagement rings. These diamonds typically measure between 6-8mm, creating a stunning focal point for a beautifully crafted ring. However, personal preference and individual style play significant roles in selecting the ideal center stone size.


Understanding diamond carat weight is essential for anyone looking to buy fine diamonds. Although carat weight refers to the weight of the diamond, not its size, it is just one aspect of the 4Cs that determine a diamond's quality. At Amada Diamonds, we offer a wide range of lab-grown diamonds in various carat weights, ensuring you find the perfect piece of jewellery that matches your style and preferences. Remember to consider the other crucial factors - cut, color, and clarity - when assessing a diamond's overall beauty. With our exceptional selection, best prices, and dedicated customer service, Amada Diamonds is your ultimate destination for exquisite diamond jewellery.

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