Moissanite Size Chart

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Unlock the secrets of moissanite sizing with our comprehensive chart. Our guide covers 20+ shapes, from classic rounds to unique fancy cuts, and provides their exact dimensions and carat weights. It is perfect for designers, jewelers, and savvy shoppers.

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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 0.20 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 6.50 mm round brilliant cut diamond weighs 1.00 ct. In comparison, a moissanite of equal dimensions (6.50 mm) will have an actual carat weight of approximately 0.88 ct or 1.00 ct (DEW). The size charts below will help you understand the dimensions of different cuts of moissanite gemstones.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
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
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.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
3.60 x 2.70 mm.	0.10 ct.
4.00 x 3.00 mm.	0.15 ct.
4.50 x 3.50 mm.	0.20 ct.
5.00 x 3.00 mm.	0.25 ct.
5.50 x 3.50 mm.	0.33 ct.
5.00 x 4.00 mm.	0.35 ct.
6.00 x 4.00 mm.	0.50 ct.
6.00 x 5.00 mm.	0.61 ct.
6.50 x 4.50 mm.	0.65 ct.
7.00 x 5.00 mm.	0.75 ct.
7.70 x 5.70 mm.	1.00 ct.
8.00 x 6.00 mm.	1.25 ct.
9.00 x 6.00 mm.	1.41 ct.
8.50 x 6.50 mm.	1.50 ct.
9.00 x 6.50 mm.	1.75 ct.
9.00 x 7.00 mm.	2.00 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
10.00 x 8.00 mm.	2.50 ct.
10.50 x 8.50 mm.	2.88 ct.
12.00 x 8.00 mm.	3.00 ct.
12.00 x 8.50 mm.	3.50 ct.
11.00 x 9.00 mm.	3.85 ct.
12.50 x 8.50 mm.	4.00 ct.
12.75 x 8.50 mm.	4.50 ct.
12.00 x 10.00 mm.	5.00 ct.
14.00 x 10.00 mm.	5.81 ct.
13.00 x 11.00 mm.	6.05 ct.
14.00 x 12.00 mm.	8.21 ct.
15.00 x 12.00 mm.	8.76 ct.
16.00 x 12.00 mm.	9.32 ct.
16.00 x 14.00 mm.	11.88 ct.
18.00 x 13.00 mm.	12.86 ct.
20.00 x 15.00 mm.	14.96 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
3.00 x 2.00 mm.	0.13 ct.
4.00 x 2.50 mm.	0.18 ct.
4.00 x 3.00 mm.	0.21 ct.
5.00 x 3.00 mm.	0.25 ct.
5.00 x 4.00 mm.	0.35 ct.
6.00 x 4.00 mm.	0.50 ct.
6.50 x 4.50 mm.	0.60 ct.
7.00 x 5.00 mm.	0.75 ct.
7.50 x 5.50 mm.	0.85 ct.
7.70 x 5.70 mm.	1.00 ct.
8.00 x 6.00 mm.	1.25 ct.
8.50 x 6.50 mm.	1.50 ct.
10.00 x 6.00 mm.	1.75 ct.
8.70 x 6.70 mm.	1.80 ct.
9.00 x 7.00 mm.	2.00 ct.
10.00 x 8.00 mm.	2.50 ct.
11.00 x 7.50 mm.	2.61 ct.
11.00 x 8.00 mm.	2.70 ct.
12.00 x 8.00 mm.	3.00 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
12.00 x 7.00 mm.	3.12 ct.
13.00 x 8.00 mm.	3.40 ct.
12.00 x 9.00 mm.	3.50 ct.
14.00 x 8.00 mm.	4.00 ct.
13.00 x 9.00 mm.	4.11 ct.
14.00 x 9.00 mm.	4.25 ct.
14.50 x 9.00 mm.	4.50 ct.
15.00 x 9.00 mm.	5.00 ct.
14.00 x 10.00 mm.	5.41 ct.
13.00 x 11.00 mm.	5.65 ct.
15.00 x 10.00 mm.	5.75 ct.
16.00 x 9.00 mm.	5.86 ct.
16.00 x 10.00 mm.	6.27 ct.
17.00 x 10.00 mm.	6.46 ct.
15.00 x 11.00 mm.	7.36 ct.
18.00 x 11.00 mm.	8.14 ct.
16.00 x 12.00 mm.	8.99 ct.
18.00 x 12.00 mm.	9.35 ct.
18.00 x 13.00 mm.	10.21 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
1.50 mm.	0.015 ct.
1.75 mm.	0.03 ct.
2.00 mm.	0.06 ct.
2.25 mm.	0.08 ct.
2.50 mm.	0.10 ct.
2.75 mm.	0.13 ct.
3.00 mm.	0.18 ct.
3.25 mm.	0.25 ct.
3.50 mm.	0.29 ct.
3.75 mm.	0.31 ct.
4.00 mm.	0.39 ct.
4.25 mm.	0.44 ct.
4.50 mm.	0.50 ct.
4.75 mm.	0.64 ct.
5.00 mm.	0.75 ct.
5.25 mm.	0.90 ct.
5.50 mm.	1.00 ct.
5.75 mm.	1.11 ct.
6.00 mm.	1.25 ct.
6.25 mm.	1.39 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
6.50 mm.	1.50 ct.
6.75 mm.	1.75 ct.
7.00 mm.	2.00 ct.
7.25 mm.	2.01 ct.
7.50 mm.	2.50 ct.
7.75 mm.	2.74 ct.
8.00 mm.	3.00 ct.
8.25 mm.	3.24 ct.
8.50 mm.	3.50 ct.
8.75 mm.	4.00 ct.
9.25 mm.	4.50 ct.
9.50 mm.	5.00 ct.
9.75 mm.	5.36 ct.
10.00 mm.	5.62 ct.
10.25 mm.	5.76 ct.
10.50 mm.	5.99 ct.
11.00 mm.	7.44 ct.
11.50 mm.	9.44 ct.
12.00 mm.	9.52 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
3.25 mm.	0.25 ct.
4.20 mm.	0.40 ct.
4.90 mm.	0.50 ct.
5.25 mm.	0.75 ct.
5.50 mm.	1.00 ct.
6.00 mm.	1.25 ct.
6.50 mm.	1.50 ct.
6.75 mm.	1.75 ct.
7.00 mm.	2.00 ct.
7.50 mm.	2.50 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
8.00 mm.	3.00 ct.
8.50 mm.	3.50 ct.
9.00 mm.	4.00 ct.
9.30 mm.	4.50 ct.
9.50 mm.	5.00 ct.
10.00 mm.	5.62 ct.
11.00 mm.	7.44 ct.
12.00 mm.	9.52 ct.
13.00 mm.	12.66 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
3.00 x 2.00 mm.	0.10 ct.
3.50 x 2.00 mm.	0.12 ct.
4.00 x 2.00 mm.	0.15 ct.
4.00 x 3.00 mm.	0.20 ct.
4.30 x 3.00 mm.	0.25 ct.
5.00 x 3.00 mm.	0.29 ct.
5.50 x 3.50 mm.	0.46 ct.
6.00 x 4.00 mm.	0.50 ct.
6.50 x 4.50 mm.	0.75 ct.
6.70 x 4.50 mm.	0.88 ct.
7.00 x 5.00 mm.	1.00 ct.
7.30 x 5.30 mm.	1.25 ct.
7.50 x 5.50 mm.	1.50 ct.
8.00 x 6.00 mm.	1.75 ct.
8.50 x 6.50 mm.	2.00 ct.
9.00 x 7.00 mm.	2.50 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
9.30 x 7.50 mm.	3.00 ct.
9.50 x 7.50 mm.	3.21 ct.
9.75 x 7.70 mm.	3.50 ct.
9.90 x 7.80 mm.	3.79 ct.
10.00 x 8.00 mm.	4.00 ct.
10.50 x 8.50 mm.	4.50 ct.
11.00 x 9.00 mm.	5.00 ct.
12.00 x 8.00 mm.	5.34 ct.
12.00 x 10.00 mm.	6.00 ct.
14.00 x 8.00 mm.	6.25 ct.
14.00 x 9.00 mm.	6.38 ct.
14.00 x 10.00 mm.	8.48 ct.
13.00 x 11.00 mm.	9.13 ct.
14.00 x 12.00 mm.	11.26 ct.
16.00 x 12.00 mm.	14.22 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
3.00 x 1.50 mm.	0.03 ct.
3.50 x 1.75 mm.	0.07 ct.
3.50 x 2.00 mm.	0.07 ct.
4.00 x 2.00 mm.	0.10 ct.
3.75 x 1.75 mm.	0.11 ct.
4.25 x 2.25 mm.	0.12 ct.
5.00 x 2.50 mm.	0.14 ct.
5.50 x 2.75 mm.	0.16 ct.
5.50 x 3.00 mm.	0.18 ct.
5.00 x 3.00 mm.	0.20 ct.
6.50 x 3.00 mm.	0.23 ct.
6.00 x 3.00 mm.	0.25 ct.
7.00 x 3.00 mm.	0.30 ct.
7.50 x 3.50 mm.	0.33 ct.
7.00 x 4.00 mm.	0.34 ct.
8.00 x 4.00 mm.	0.50 ct.
8.75 x 4.25 mm.	0.70 ct.
9.00 x 4.50 mm.	0.75 ct.
9.50 x 4.70 mm.	0.85 ct.

MOISSANITE SIZE	DIAMOND EQUIVALENT WEIGHT
10.00 x 5.00 mm.	1.00 ct.
11.00 x 5.50 mm.	1.25 ct.
11.50 x 6.00 mm.	1.33 ct.
12.00 x 6.00 mm.	1.50 ct.
12.50 x 6.25 mm.	1.75 ct.
13.00 x 6.50 mm.	2.00 ct.
14.00 x 7.00 mm.	2.50 ct.
15.00 x 7.00 mm.	3.00 ct.
15.00 x 7.50 mm.	3.25 ct.
15.00 x 8.00 mm.	3.50 ct.
16.00 x 8.00 mm.	3.86 ct.
16.50 x 8.25 mm.	4.00 ct.
16.75 x 8.50 mm.	4.50 ct.
17.00 x 8.50 mm.	5.00 ct.
17.50 x 10.00 mm.	5.50 ct.
20.00 x 8.00 mm.	7.08 ct.
20.00 x 10.00 mm.	7.94 ct.
20.00 x 11.00 mm.	9.50 ct.

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