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Moissanite Size Chart

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Converting millimeters (mm) to Diamond Equivalent Weight (DEW) allows for straightforward comparison between moissanite and diamonds, with DEW serving as the standard for expressing moissanite’s carat weight. Traditionally, gemstones are measured using the carat (ct) weight, where 1.00 carat equals 0.200 grams or 1/5 gram. Moissanite gemstones share identical dimensions in millimeters with diamonds but are marginally lighter due to their specific gravity of 3.22 grams per cubic centimeter.

This difference makes ordering moissanite gemstones by millimeter size advantageous for fitting them into available settings. For example, a 6.50mm round brilliant diamond weighs 1.00ct. In comparison, a moissanite of equal dimensions (6.50mm) will have an actual carat weight of approximately 0.88ct or 1.00ct (DEW). The size chart below will help you understand the dimensions of round cut moissanite gemstones.

MOISSANITE SIZE DIAMOND EQUIVALENT WEIGHT (DEW)
0.80 mm. 0.0025 ct.
1.00 mm. 0.005 ct.
1.10 mm. 0.0067 ct.
1.20 mm. 0.009 ct.
1.25 mm. 0.01 ct.
1.30 mm. 0.01 ct.
1.50 mm. 0.015 ct.
1.75 mm. 0.02 ct.
1.80 mm. 0.025 ct.
2.00 mm. 0.03 ct.
2.20 mm. 0.04 ct.
2.50 mm. 0.06 ct.
2.75 mm. 0.08 ct.
3.00 mm. 0.10 ct.
3.25 mm. 0.14 ct.
3.50 mm. 0.17 ct.
3.75 mm. 0.21 ct.
4.00 mm. 0.25 ct.
4.25 mm. 0.28 ct.
4.50 mm. 0.36 ct.
4.75 mm. 0.44 ct.
5.00 mm. 0.50 ct.
5.25 mm. 0.56 ct.
5.50 mm. 0.66 ct.
5.75 mm. 0.75 ct.
6.00 mm. 0.84 ct.
6.25 mm. 0.93 ct.
6.50 mm. 1.00 ct.
6.80 mm. 1.25 ct.
MOISSANITE SIZE DIAMOND EQUIVALENT WEIGHT (DEW)
7.00 mm. 1.30 ct.
7.30 mm. 1.50 ct.
7.50 mm. 1.67 ct.
7.75 mm. 1.75 ct.
8.00 mm. 2.00 ct.
8.25 mm. 2.11 ct.
8.50 mm. 2.43 ct.
8.70 mm. 2.50 ct.
9.00 mm. 2.75 ct.
9.10 mm. 3.00 ct.
9.50 mm. 3.35 ct.
9.75 mm. 3.61 ct.
10.00 mm. 3.87 ct.
10.25 mm. 4.16 ct.
10.50 mm. 4.41 ct.
10.75 mm. 4.57 ct.
11.00 mm. 4.91 ct.
11.25 mm. 5.49 ct.
11.50 mm. 5.85 ct.
12.00 mm. 6.84 ct.
12.25 mm. 7.26 ct.
12.50 mm. 7.36 ct.
12.75 mm. 7.52 ct.
13.00 mm. 8.51 ct.
13.50 mm. 9.53 ct.
14.00 mm. 10.49 ct.
15.00 mm. 12.89 ct.
16.00 mm. 16.06 ct.
17.00 mm. 18.00 ct.
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