Round cut diamond size chart (MM)

Round

Princess

Emerald

Asscher

Oval

Cushion

Pear

Heart

Marquise

Radiant

Triangular

round diamond sizes in mm

Round MM Size	Round Carat Weight
0.8 mm.	0.0025 ct.
1 mm.	0.005 ct.
1.1 mm.	0.0067 ct.
1.2 mm.	0.009 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.
2.2 mm.	0.04 ct.
2.5 mm.	0.06 ct.
2.75 mm.	0.08 ct.
3 mm.	0.10 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.
4.50 mm.	0.36 ct.
4.75 mm.	0.44 ct.
5 mm.	0.50 ct.
5.25 mm.	0.56 ct.
5.50 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.

Round MM Size	Round Carat Weight
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.

princess diamond sizes in mm

Princess MM Size	Princess 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.
4.50 mm.	0.50 ct.
4.75 mm.	0.64 ct.
5 mm.	0.75 ct.
5.25 mm.	0.90 ct.
5.50 mm.	1.00 ct.
5.75 mm.	1.11 ct.
6 mm.	1.25 ct.
6.25 mm.	1.39 ct.

Princess MM Size	Princess Carat Weight
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.
9.50 mm.	5.09 ct.
9.75 mm.	5.36 ct.
10 mm.	5.62 ct.
10.25 mm.	5.76 ct.
10.50 mm.	5.99 ct.
11 mm.	7.44 ct.
11.5 mm.	9.44 ct.
12 mm.	9.52 ct.

Emerald diamond sizes in mm

Emerald MM Size	Emerald Carat Weight
3*2 mm.	0.10 ct.
3.5*2 mm.	0.12 ct.
4*2 mm.	0.15 ct.
4*3 mm.	0.20 ct.
5*3 mm.	0.29 ct.
5.5*3.5 mm.	0.46 ct.
6*4 mm.	0.50 ct.
6.4*4.5 mm.	0.75 ct.
6.7*4.5 mm.	0.88 ct.
7*5 mm.	1.00 ct.
7.3*5.3 mm.	1.25 ct.
7.5*5.5 mm.	1.50 ct.
8*6 mm.	1.75 ct.
8.5*6.5 mm.	2.00 ct.

Emerald MM Size	Emerald Carat Weight
9*7 mm.	2.50 ct.
10*7.5 mm.	3.00 ct.
9.5*7.5 mm.	3.21 ct.
10*8 mm.	3.79 ct.
11*9 mm.	5.21 ct.
12*8 mm.	5.34 ct.
12*10 mm.	6.00 ct.
14*8 mm.	6.25 ct.
13*9 mm.	6.38 ct.
14*10 mm.	8.48 ct.
13*11 mm.	9.13 ct.
14*12 mm.	11.26 ct.
16*12 mm.	14.22 ct.

asscher diamond sizes in mm

Asscher MM Size	Asscher 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.

Asscher MM Size	Asscher Carat Weight
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 diamond sizes in mm

Oval MM Size	Oval Carat Weight
4.5*3.5 mm.	0.21 ct.
5*3 mm.	0.21 ct.
5.5*3.5 mm.	0.33 ct.
5*4 mm.	0.35 ct.
6*4 mm.	0.50 ct.
6*5 mm.	0.61 ct.
6.5*4.5 mm.	0.65 ct.
7*5 mm.	0.75 ct.
7.7*5.7 mm.	1.00 ct.
8*6 mm.	1.25 ct.
9*6 mm.	1.41 ct.
8.5*6.5 mm.	1.50 ct.
9*7 mm.	2.00 ct.

Oval MM Size	Oval Carat Weight
10*8 mm.	2.50 ct.
10.5*8.5 mm.	2.88 ct.
12*8 mm.	3.00 ct.
11*9 mm.	3.85 ct.
12*10 mm.	5.05 ct.
14*10 mm.	5.81 ct.
13*11 mm.	6.05 ct.
14*12 mm.	8.21 ct.
15*12 mm.	8.76 ct.
16*12 mm.	9.32 ct.
16*14 mm.	11.88 ct.
18*13 mm.	12.86 ct.
20*15 mm.	14.96 ct.

Cushion diamond sizes in mm

Cushion MM Size	Cushion Carat Weight
4.2 mm.	0.40 ct.
4.9 mm.	0.50 ct.
5.25 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.

Cushion MM Size	Cushion Carat Weight
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.

pear diamond sizes in mm

Pear MM Size	Pear Carat Weight
3*2 mm.	0.13 ct.
4*2.5 mm.	0.18 ct.
4*3 mm.	0.21 ct.
5*3 mm.	0.25 ct.
5*4 mm.	0.35 ct.
6*4 mm.	0.50 ct.
6.5*4.5 mm.	0.60 ct.
7*5 mm.	0.75 ct.
7.5*5.5 mm.	0.85 ct.
7.7*5.7 mm.	1.00 ct.
8*6 mm.	1.25 ct.
8.5*6.5 mm.	1.50 ct.
10*6 mm.	1.71 ct.
8.7*6.7 mm.	1.80 ct.
9*7 mm.	2.00 ct.
10*8 mm.	2.50 ct.
11*7.50 mm.	2.61 ct.
13*8 mm.	2.98 ct.
11*8 mm.	3.00 ct.

Cushion MM Size	Cushion Carat Weight
12*8 mm.	3.00 ct.
12*7 mm.	3.12 ct.
12*9 mm.	3.44 ct.
14*8 mm.	3.47 ct.
13*9 mm.	4.11 ct.
14*9 mm.	4.25 ct.
15*9 mm.	5.06 ct.
14*10 mm.	5.41 ct.
13*11 mm.	5.65 ct.
15*10 mm.	5.75 ct.
16*9 mm.	5.86 ct.
16*10 mm.	6.27 ct.
17*10 mm.	6.46 ct.
15*11 mm.	7.36 ct.
18*11 mm.	8.14 ct.
16*12 mm.	8.99 ct.
18*12 mm.	9.35 ct.
18*13 mm.	10.21 ct.

Heart diamond sizes in mm

Heart MM Size	Heart 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.

Heart MM Size	Heart Carat Weight
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.

marquise diamond sizes in mm

Marquise MM Size	Marquise Carat Weight
3*1.5 mm.	0.025 ct.
3.5*1.75 mm.	0.065 ct.
3.5*2 mm.	0.07 ct.
4*2 mm.	0.10 ct.
3.75*1.75 mm.	0.11 ct.
4.25*2.25 mm.	0.12 ct.
5*2.5 mm.	0.14 ct.
5.5*2.75 mm.	0.16 ct.
5.5*3 mm.	0.18 ct.
5*3 mm.	0.20 ct.
6.5*3 mm.	0.23 ct.
6*3 mm.	0.25 ct.
7*3 mm.	0.30 ct.
7.5*3.5 mm.	0.33 ct.
7*4 mm.	0.34 ct.
8*4 mm.	0.50 ct.
8.75*4.25 mm.	0.70 ct.
9*4.5 mm.	0.75 ct.

Marquise MM Size	Marquise Carat Weight
9.5*4.7 mm.	0.85 ct.
10*5 mm.	1.00 ct.
11*5.5 mm.	1.25 ct.
11.5*6 mm.	1.33 ct.
12*6 mm.	1.50 ct.
13*6.5 mm.	2.00 ct.
14*7 mm.	2.50 ct.
15*7 mm.	3.00 ct.
14*8 mm.	3.00 ct.
15*7.5 mm.	3.25 ct.
15*8 mm.	3.44 ct.
16*8 mm.	3.86 ct.
16.5*8.25 mm.	4.00 ct.
17*8.5 mm.	4.88 ct.
17.5*10 mm.	5.50 ct.
20*8 mm.	7.08 ct.
20*10 mm.	7.94 ct.
20*11 mm.	9.50 ct.

Radiant diamond sizes in mm

Radiant MM Size	Radiant Carat Weight
5*3 mm.	0.31 ct.
4.5*3.5 mm.	0.34 ct.
6*3 mm.	0.41 ct.
6*4 mm.	0.50 ct.
6.5*4.5 mm.	0.75 ct.
7*5 mm.	1.00 ct.
7.3*5.5 mm.	1.25 ct.
7.5*5.8 mm.	1.50 ct.
8*6 mm.	2.00 ct.
8.5*6.5 mm.	2.25 ct.
9*7 mm.	2.50 ct.
9.5*7.5 mm.	3.00 ct.
10*7 mm.	3.31 ct.

Radiant MM Size	Radiant Carat Weight
10*8 mm.	3.50 ct.
11*9 mm.	5.05 ct.
12*9 mm.	6.06 ct.
11.5*10 mm.	6.45 ct.
13*9 mm.	6.54 ct.
12*10 mm.	6.79 ct.
14*10 mm.	8.47 ct.
13*11 mm.	9.33 ct.
13.5*11.5 mm.	10.19 ct.
15*11 mm.	11.48 ct.
14*12 mm.	12.14 ct.
16*12 mm.	14.22 ct.

Triangular diamond sizes in mm

Triangular MM Size	Triangular Carat Weight
5*3 mm.	0.31 ct.
4.5*3.5 mm.	0.34 ct.
6*3 mm.	0.41 ct.
6*4 mm.	0.50 ct.
6.5*4.5 mm.	0.75 ct.
7*5 mm.	1.00 ct.
7.3*5.5 mm.	1.25 ct.
7.5*5.8 mm.	1.50 ct.
8*6 mm.	2.00 ct.
8.5*6.5 mm.	2.25 ct.
9*7 mm.	2.50 ct.
9.5*7.5 mm.	3.00 ct.
10*7 mm.	3.31 ct.

Triangular MM Size	Triangular Carat Weight
10*8 mm.	3.50 ct.
11*9 mm.	5.05 ct.
12*9 mm.	6.06 ct.
11.5*10 mm.	6.45 ct.
13*9 mm.	6.54 ct.
12*10 mm.	6.79 ct.
14*10 mm.	8.47 ct.
13*11 mm.	9.33 ct.
13.5*11.5 mm.	10.19 ct.
15*11 mm.	11.48 ct.
14*12 mm.	12.14 ct.
16*12 mm.	14.22 ct.

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