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Diamond Carat Weight to MM Conversion

When it comes to diamonds, the term "carat weight" is frequently mentioned. Carat weight, one of the famous 4 Cs of diamonds (cut, color, clarity, and carat), is crucial in determining a diamond's value. But how does carat weight translate into actual size? Here, we'll delve into the relationship between carat weight and the size of diamonds across different shapes.

What is Carat Weight?

Carat weight measures the weight of a diamond. One carat equals approximately 0.2 grams. While carat weight can give an idea of the size, it is not a direct indicator. The actual size appearance can vary based on the diamond's shape and how it is cut.

Carat Weight and Diamond Size

Below are the approximate sizes for various carat weights for different diamond shapes:

Round Diamonds
- 1 mm = 0.005 carat
- 1.5 mm = 0.015 carat
- 2 mm = 0.03 carat
- 2.5 mm = 0.06 carat
- 3 mm = 0.10 carat
- 3.5 mm = 0.16 carat
- 4.1 mm = 0.25 carat
- 4.6 mm = 0.38 carat
- 5.2 mm = 0.50 carat
- 5.6 mm = 0.65 carat
- 6 mm = 0.80 carat
- 6.4 mm = 1.00 carat
- 7 mm = 1.25 carat
- 7.5 mm = 1.60 carat
- 8 mm = 2.00 carat
- 8.6 mm = 2.50 carat
- 9.3 mm = 3.00 carat
- 9.8 mm = 3.50 carat
- 10.2 mm = 4.00 carat
- 10.5 mm = 4.50 carat
- 11 mm = 5.00 carat

Square Diamonds
- 1.25 mm = 0.015 carat
- 1.5 mm = 0.025 carat
- 2 mm = 0.05 carat
- 2.5 mm = 0.09 carat
- 3 mm = 0.16 carat
- 3.5 mm = 0.25 carat
- 4 mm = 0.40 carat
- 4.5 mm = 0.50 carat
- 5 mm = 0.75 carat
- 5.5 mm = 1.00 carat
- 6.5 mm = 1.50 carat
- 7 mm = 2.00 carat
- 8 mm = 3.00 carat
- 9 mm = 4.00 carat
- 9.5 mm = 5.00 carat

Oval Diamonds
- 3 x 2.3 mm = 0.05 carat
- 3.6 x 2.7 mm = 0.10 carat
- 4 x 3 mm = 0.16 carat
- 4.5 x 3 mm = 0.20 carat
- 5 x 3 mm = 0.25 carat
- 5 x 4 mm = 0.33 carat
- 6 x 4 mm = 0.38 carat
- 6.25 x 4.5 mm = 0.50 carat
- 7 x 5 mm =0.75 carat
- 8 x 6 mm = 1.00 carat
- 9 x 6.5 mm = 1.50 carat
- 10 x 7 mm = 2.00 carat
- 11.5 x 8 mm = 3.00 carat
- 12.5 x 9 mm = 4.00 carat
- 13.6 x 10 mm 5.00 carat

Marquise Diamonds
- 2.5 x 1.25 mm = 0.025 carat
- 3 x 1.5 mm = 0.035 carat
- 3.5 x 1.75 mm = 0.05 carat
- 3.5 x 2 mm = 0.07 carat
- 4 x 2 mm = 0.08 carat
- 4.5 x 2.5 mm = 0.12 carat
- 5 x 2.5 mm = 0.15 carat
- 5 x 3 mm = 0.20 carat
- 6 x 3 mm = 0.25 carat
- 6 x 3.5 mm = 0.33 carat
- 8 x 4 mm = 0.50 carat
- 9 x 5 mm = 0.75 carat
- 10.5 x 5.5 = 1.00 carat
- 11.5 x 6 mm = 1.50 carat
- 12.5 x 6.5 mm = 2.00 carat
- 15 x 7.5 mm = 3.00 carat
- 15.5 x 8 mm = 4.00 carat
- 17.5 x 8.5 mm = 5.00 carat

Emerald Cut Diamonds
- 3 x 2.3 mm = 0.10 carat
- 3.75 x 2.75 mm = 0.20 carat
- 4 x 3 mm = 0.25 carat
- 4.5 x 3 mm = 0.33 carat
- 5 x 3.5 mm = 0.40 carat
- 5.5 x 4 mm = 0.50 carat
- 6 x 4.5 mm = 0.75 carat
- 6.5 x 5 mm = 1.00 carat
- 7.5 x 5.5 mm = 1.50 carat
- 8.5 x 6 mm = 2.00 carat
- 9.5 x 7 mm = 3.00 carat
- 10.5 x 8 mm = 4.00 carat
- 11.5 x 8.5 mm = 5.00 carat

Pear Diamonds
- 3 x 2 mm = 0.05 carat
- 4 x 2.5 mm = 0.11 carat
- 4.5 x 3 mm = 0.16 carat
- 5 x 3 mm = 0.20 carat
- 5.5 x 3.5 mm = 0.25 carat
- 6 x 4 mm = 0.33 carat
- 7 x 5 mm = 0.50 carat
- 7.5 x 5.25 mm = 0.75 carat
- 8.5 x 5.5 mm = 1.00 carat
- 9.5 x 6.5 mm = 1.50 carat
- 11 x 7 mm = 2.00 carat
- 12.5 x 8 mm = 3.00 carat
- 13.5 x 9 mm = 4.00 carat
- 15 x 9.5 mm = 5.00 carat

Trillion Diamonds
- 2.5 mm = 0.05 carat
- 3 mm = 0.09 carat
- 3.5 mm = 0.12 carat
- 4 mm = 0.18 carat
- 4.5 mm = 0.23 carat
- 5 mm = 0.33 carat
- 5.5 mm = 0.40 carat
- 6 mm =0.50 carat
- 7 mm = 0.75 carat
- 8 mm = 1.00 carat
- 9 mm = 1.50 carat
- 10 mm = 2.00 carat

Asscher Diamonds
- 2 mm = 0.05 carat
- 2.6 mm = 0.10 carat
- 3 mm = 0.16 carat
- 3.5 mm = 0.25 carat
- 4 mm = 0.33 carat
- 4.5 mm = 0.50 carat
- 5 mm = 0.75 carat
- 5.5 mm = 1.00 carat
- 6.25 mm = 1.50 carat
- 7 mm = 2.00 carat
- 8 mm = 3.00 carat
- 8.5 mm = 4.00 carat
- 9.5 mm = 5.00 carat

Cushion Cut Diamonds
- 3 mm = 0.16 carat
- 3.6mm = 0.25 carat
- 4.5 mm = 0.50 carat
- 5.25 mm = 0.75 carat
- 6 mm = 1.25 carat
- 6.5 mm = 1.50 carat
- 7 mm = 2.00 carat
- 8.2 mm = 3.00 carat
- 8.7 mm = 4.00 carat
- 9.7 mm = 5.00 carat

Conclusion

While these measurements provide a good guideline, it's essential to remember that each diamond is unique. Variations in cutting styles mean that two diamonds of the same carat weight might look different in size. When purchasing a diamond, working with an expert ensures you get a diamond that is not only beautiful but also a great value for its carat weight.

If you have any questions or need assistance in selecting the perfect diamond, feel free to reach out to us at Luchysluxe. We are here to help you make the best choice for your luxury jewelry needs.
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