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Lab Diamond Carat Guide

Lab created diamonds uk, also known as lab-grown or synthetic diamonds, are created in a laboratory environment that simulates the natural diamond formation process. These diamonds have the same chemical, physical, and optical properties as natural diamonds, but they are often less expensive.

When purchasing a lab diamond, the carat weight is an important factor to consider.

Carat weight refers to the weight of the diamond and is often the most important factor in determining its value. One carat is equal to 0.2 grams, and lab diamonds can range from less than 0.01 carats to several carats in size.

Here is a guide to lab diamond carat weights:

  • Less than 0.5 carats: These diamonds are relatively small and are often used in accent stones or in jewellery with multiple diamonds. They can still be stunning when paired with other stones or set in delicate jewellery pieces.
  • 0.5-1 carat: This is the most common size range for lab diamonds, and they can be a great option for an engagement ring or other centrepiece jewellery piece. They offer a good balance between size and cost.
  • 1-2 carats: These diamonds are larger and will be more noticeable on the finger. They can also be quite expensive, depending on other factors like cut, clarity, and colour.
  • 2-3 carats: These diamonds are considered quite large and will make a bold statement. They are also very expensive, so they may not be a practical option for everyone.
  • Over 3 carats: These diamonds are extremely rare and valuable, and they are often found only in high-end jewellery stores or auction houses.

When choosing a lab diamond, it’s important to remember that carat weight is just one factor to consider.

When it comes to lab-grown diamonds, the 4 Cs of diamond quality still apply: carat weight, cut, colour, and clarity. Here’s a guide specifically for the carat weight and cut of lab-grown diamonds:

Carat Weight:

Lab-grown diamonds are available in a wide range of carat weights, just like natural diamonds. Carat weight refers to the actual weight of the diamond and is measured in carats. One carat is equal to 0.2 grams.

When it comes to choosing the right carat weight for your lab-grown diamond, it really depends on your personal preferences and budget. Keep in mind that larger diamonds will generally cost more than smaller diamonds.


The cut of a diamond refers to how well it has been cut and shaped from the rough stone. A well-cut diamond will reflect light back to the viewer, creating a beautiful sparkle and fire.

The cut of a diamond is often described using terms such as “ideal”, “excellent”, “very good”, “good”, “fair”, and “poor”. A well-cut lab-grown diamond will have excellent light performance and be very sparkly.

When choosing a lab-grown diamond, it’s important to consider both the carat weight and the cut. A smaller, well-cut diamond may actually appear larger and more brilliant than a larger, poorly cut diamond. So, it’s important to balance the carat weight and the cut to get the best value for your money.

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