Carat Weight TO Millimeter Size
Round MM SizeRound Carat Weight
0.8 mm.0.0025 ct.
1 mm.0.005 ct.
1.12 mm.0.0067 ct.
1.15 mm.0.0075 ct.
1.25 mm.0.01 ct.
1.3 mm.0.01 ct.
1.5 mm.0.015 ct.
1.75 mm.0.02 ct.
1.8 mm.0.025 ct.
2 mm.0.03 ct.
2.25 mm.0.04 ct.
2.5 mm.0.06 ct.
2.75 mm.0.08 ct.
3 mm.0.11 ct.
3.25 mm.0.14 ct.
3.5 mm.0.17 ct.
3.75 mm.0.21 ct.
4 mm.0.25 ct.
4.25 mm.0.28 ct.
4.5 mm.0.36 ct.
4.75 mm.0.44 ct.
5.0 mm.0.50 ct.
5.25 mm.0.56 ct.
5.5 mm.0.66 ct.
5.75 mm.0.75 ct.
6 mm.0.84 ct.
6.25 mm.0.93 ct.
6.5 mm.1.00 ct.
6.8 mm.

1.25 ct.

7 mm.1.30 ct.
7.3 mm.1.50 ct.
7.5 mm.1.67 ct.
7.75 mm.1.75 ct.
8 mm.2.00 ct.
8.25 mm.2.11 ct.
8.5 mm.2.43 ct.
8.7 mm.2.50 ct.
9 mm.2.75 ct.
9.1 mm.3.00 ct.
9.5 mm.3.35 ct.
9.75 mm.3.61 ct.
10 mm.3.87 ct.
10.25 mm.4.16 ct.
10.5 mm.4.41 ct.
10.75 mm.4.57 ct.
11 mm.4.91 ct.
11.25 mm.5.49 ct.
11.5 mm.5.85 ct.
12 mm.6.84 ct.
12.25 mm.7.26 ct.
12.5 mm.7.36 ct.
12.75 mm.7.52 ct.
13 mm.8.51 ct.
13.5 mm.9.53 ct.
14 mm.10.49 ct.
15 mm.12.89 ct.
16 mm.16.06 ct.

 

rincess MM SizePrincess Carat Weight
1.5 mm.0.015 ct.
1.75 mm.0.03 ct.
2 mm.0.06 ct.
2.25 mm.0.08 ct.
2.5 mm.0.10 ct.
2.75 mm.0.13 ct.
3 mm.0.18 ct.
3.25 mm.0.26 ct.
3.5 mm.0.29 ct.
3.75 mm.0.31 ct.
4 mm.0.39 ct.
4.25 mm.0.44 ct.
4.5 mm.0.50 ct.
4.75 mm.0.64 ct.
5 mm.0.75 ct.
5.25 mm.0.90 ct.
5.5 mm.1.00 ct.
5.75 mm.1.11 ct.
6 mm.1.25 ct.
6.25 mm.1.39 ct.
6.5 mm.1.50 ct.
6.75 mm.1.75 ct.
7 mm.2.00 ct.
7.25 mm.2.01 ct.
7.5 mm.2.50 ct.
7.75 mm.2.74 ct.
8 mm.3.00 ct.
8.25 mm.3.24 ct.
8.5 mm.3.67 ct.
8.75 mm.4.10 ct.
9 mm.4.12 ct.
9.5 mm.5.09 ct.
9.75 mm.5.36 ct.
10 mm.5.62 ct.
10.25 mm.5.76 ct.
10.5 mm.5.99 ct.
11 mm.7.44 ct.
11.5 mm.9.44 ct.
12 mm.9.52 ct.

 

 

Cushion MM SizeCushion Carat Weight
4.2 mm.0.40 ct.
4.9 mm.0.50 ct.
5.25 mm.0.75 ct.
5.5 mm.1.00 ct.
6 mm.1.25 ct.
6.5 mm.1.50 ct.
7 mm.2.00 ct.
7.5 mm.2.50 ct.Z
8 mm.3.00 ct.
8.5 mm.3.50 ct.
9 mm.4.12 ct.
9.5 mm.5.09 ct.
10 mm.5.62 ct.
11 mm.7.44 ct.
12 mm.9.52 ct.
13 mm.12.66 ct.

 

 

 

Oval MM SizeOval Carat Weight
4.5x3.5 mm.0.21 ct.
5x3 mm.0.21 ct.
5.5x3.5 mm.0.33 ct.
5x4 mm.0.35 ct.
6x4 mm.0.50 ct.
6x5 mm.0.61 ct.
6.5x4.5 mm.0.65 ct.
7x5 mm.0.75 ct.
7.7x5.7 mm.1.00 ct.
8x6 mm.1.25 ct.
9x6 mm.1.41 ct.
8.5x6.5 mm.1.50 ct.
9x7 mm.2.00 ct.
10x8 mm.2.50 ct.
10.5x8.5 mm.2.88 ct.
12x8 mm.3.00 ct.
11x9 mm.3.85 ct.
12x10 mm.5.05 ct.
14x10 mm.5.81 ct.
13x11 mm.6.05 ct.
14x12 mm.8.21 ct.
15x12 mm.8.76 ct.
16x12 mm.9.32 ct.
16x14 mm.11.88 ct.
18x13 mm.12.86 ct.
20x15 mm.14.96 ct.

 

Emerald MM SizeEmerald Carat Weight
3x2 mm.0.10 ct.
3.5x2 mm.0.12 ct.
4x2 mm.0.15 ct.
4x3 mm.0.20 ct.
5x3 mm.0.29 ct.
5.5x3.5 mm.0.46 ct.
6x4 mm.0.50 ct.
6.5x4.5 mm.0.75 ct.
6.7x4.5 mm.0.88 ct.
7x5 mm.1.00 ct.
7.3x5.3 mm.1.25 ct.
7.5x5.5 mm.1.50 ct.
8x6 mm.1.75 ct.
8.5x6.5 mm.2.00 ct.
9x7 mm.2.50 ct.
10x7.5 mm.3.00 ct.
9.5x7.5 mm.3.21 ct.
10x8 mm.3.79 ct.
11x9 mm.5.21 ct.
12x8 mm.5.34 ct.
12x10 mm.6.00 ct.
14x8 mm.6.25 ct.
13x9 mm.6.38 ct.
14x10 mm.8.48 ct.
13x11 mm.9.13 ct.
14x12 mm.11.26 ct.
16x12 mm.14.22 ct.

 

Heart MM SizeHeart Carat Weight
3.5 mm.0.18 ct.
4 mm.0.25 ct.
4.25 mm.0.28 ct.
4.5 mm.0.34 ct.
4.75 mm.0.38 ct.
5 mm.0.50 ct.
5.5 mm.0.61 ct.
6 mm.0.75 ct.
6.25 mm.0.83 ct.
6.5 mm.1.00 ct.
7 mm.1.25 ct.
7.5 mm.1.50 ct.
8 mm.2.00 ct.
8.5 mm.2.50 ct.
9 mm.3.00 ct.
10 mm.3.50 ct.
11 mm.4.41 ct.
12 mm.5.66 ct.
13 mm.7.88 ct.
14 mm.9.38 ct.
15 mm.10.79 ct.
16 mm.13.27 ct.
18 mm.15.33 ct.

 

 

 

Pear MM SizePear Carat Weight
3x2 mm.0.13 ct.
4x2.5 mm.0.18 ct.
4x3 mm.0.21 ct.
5x3 mm.0.25 ct.
5x4 mm.0.35 ct.
6x4 mm.0.50 ct.
6.5x4.5 mm.0.60 ct.
7x5 mm.0.75 ct.
7.5x5.5 mm.0.85 ct.
7.7x5.7 mm.1.00 ct.
8x6 mm.1.25 ct.
8.5x6.5 mm.1.50 ct.
10x6 mm.1.71 ct.
8.7x6.7 mm.1.80 ct.
9x7 mm.2.00 ct.
10x8 mm.2.50 ct.
11x7.50 mm.2.61 ct.
13x8 mm.2.98 ct.
11x8 mm.3.00 ct.
12x8 mm.3.00 ct.
12x7 mm.3.12 ct.
12x9 mm.3.44 ct.
14x8 mm.3.47 ct.
13x9 mm.4.11 ct.
14x9 mm.4.25 ct.
15x9 mm.5.06 ct.
14x10 mm.5.41 ct.
13x11 mm.5.65 ct.
15x10 mm.5.75 ct.
16x9 mm.5.86 ct.
16x10 mm.6.27 ct.
17x10 mm.6.46 ct.
15x11 mm.7.36 ct.
18x11 mm.8.14 ct.
16x12 mm.8.99 ct.
18x12 mm.9.35 ct.
18x13 mm.10.21 ct.

 

Marquise MM SizeMarquise Carat Weight
3x1.5 mm.0.025 ct.
3.5x1.75 mm.0.065 ct.
3.5x2 mm.0.07 ct.
4x2 mm.0.10 ct.
3.75x1.75 mm.0.11 ct.
4.25x2.25 mm.0.12 ct.
5x2.5 mm.0.14 ct.
5.5x2.75 mm.0.16 ct.
5.5x3 mm.0.18 ct.
5x3 mm.0.20 ct.
6.5x3 mm.0.23 ct.
6x3 mm.0.25 ct.
7x3 mm.0.30 ct.
7.5x3.5 mm.0.33 ct.
7x4 mm.0.34 ct.
8x4 mm.0.50 ct.
8.75x4.25 mm.0.70 ct.
9x4.5 mm.0.75 ct.
9.5x4.7 mm.0.85 ct.
10x5 mm.1.00 ct.
11x5.5 mm.1.25 ct.
11.5x6 mm.1.33 ct.
12x6 mm.1.50 ct.
13x6.5 mm.2.00 ct.
14x7 mm.2.50 ct.
15x7 mm.3.00 ct.
14x8 mm.3.00 ct.
15x7.5 mm.3.25 ct.
15x8 mm.3.44 ct.
16x8 mm.3.86 ct.
16.5x8.25 mm.4.00 ct.
17x8.5 mm.4.88 ct.
17.5x10 mm.5.50 ct.
20x8 mm.7.08 ct.
20x10 mm.7.94 ct.
20x11 mm.9.50 ct.

 

Asscher MM SizeAsscher Carat Weight
4 mm.0.39 ct.
4.5 mm.0.50 ct.
5 mm.0.75 ct.
5.5 mm.1.00 ct.
6 mm.1.25 ct.
6.5 mm.1.50 ct.
7 mm.2.00 ct.
7.5 mm.2.50 ct.
8 mm.3.00 ct.
8.5 mm.3.50 ct.
9 mm.4.12 ct.
9.5 mm.5.09 ct.
10 mm.5.62 ct.
11 mm.7.44 ct.
12 mm.9.52 ct.
13 mm.12.66 ct.

 

Radiant MM SizeRadiant Carat Weight
5x3 mm.0.31 ct.
4.5x3.5 mm.0.34 ct.
6x3 mm.0.41 ct.
6x4 mm.0.50 ct.
6.5x4.5 mm.0.75 ct.
7x5 mm.1.00 ct.
7.3x5.5 mm.1.25 ct.
7.5x5.8 mm.1.50 ct.
8x6 mm.2.00 ct.
8.5x6.5 mm.2.25 ct.
9x7 mm.2.50 ct.
9.5x7.5 mm.3.00 ct.
10x7 mm.3.31 ct.
10x8 mm.3.50 ct.
11x9 mm.5.05 ct.
12x9 mm.6.06 ct.
11.5x10 mm.6.45 ct.
13x9 mm.6.54 ct.
12x10 mm.6.79 ct.
14x10 mm.8.47 ct.
13x11 mm.9.33 ct.
13.5x11.5 mm.10.19 ct.
15x11 mm.11.48 ct.
14x12 mm.12.14 ct.
16x12 mm.14.22 ct.

 

 

 

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