Moissanite is a popular choice for engagement rings due to its beauty, durability, and affordability. However, it can be challenging to understand the size of moissanite in terms of carats, especially when shopping online. In this article, we will explore everything you need to know about 6mm moissanite in carats.

What is Moissanite?

Moissanite is a lab-created gemstone that shares many similarities with diamonds. It has a high refractive index, which means that it has exceptional sparkle and brilliance. It is also highly durable, making it an excellent choice for engagement rings.

Understanding Carats

Carats are a measure of weight used for gemstones. One carat is equal to 0.2 grams or 200 milligrams. When it comes to moissanite, the size of the stone is usually measured in millimeters.

6mm Moissanite in Carats

A 6mm moissanite stone is equivalent to approximately 0.8 carats. However, it is important to note that carat weight is not the only factor that determines the size of a moissanite stone. The cut, shape, and depth of the stone also play a significant role in its overall size and appearance.

Comparing to Diamond Carat Weight

When it comes to diamond carat weight, a 6mm diamond would be equivalent to approximately 0.75 carats. This is because diamonds are denser than moissanite, so a diamond of the same size as a moissanite stone would weigh more.

How to Choose the Right Carat Weight

Choosing the right carat weight for your moissanite engagement ring depends on your personal preference and budget. It is essential to keep in mind that larger stones will generally be more expensive. However, a well-cut smaller stone can also have a beautiful sparkle and appearance.

The Importance of Cut

The cut of a moissanite stone is crucial in determining its overall appearance and sparkle. A well-cut stone will have better light performance and appear larger than a poorly cut stone of the same carat weight.

Shape and Carat Weight

The shape of a moissanite stone also plays a significant role in its carat weight and overall appearance. Different shapes can affect the perceived size of the stone. For example, a round brilliant cut stone will appear larger than a princess cut stone of the same carat weight.

Price and Carat Weight

The price of a moissanite stone will vary depending on its carat weight, as well as other factors such as cut, color, and clarity. Generally, the larger the stone, the higher the price. However, moissanite remains a more affordable option than diamonds.

Final Thoughts

Understanding the relationship between 6mm moissanite and carat weight can help you make an informed decision when choosing your engagement ring. While carat weight is an important factor, it is also essential to consider other factors such as cut, shape, and price.


A 6mm moissanite stone is equivalent to approximately 0.8 carats. However, carat weight is just one factor to consider when choosing the size and appearance of your moissanite engagement ring. Ultimately, the right choice depends on your personal preference and budget.

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