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The Diamond Size Chart

Actual sizes on screen for round diamonds

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0.03 carat

⌀ 2 mm

0.006g

0.05 carat

⌀ 2.4 mm

0.01g

0.07 carat

⌀ 2.7 mm

0.014g

0.10 carat

⌀ 3 mm

0.02g

0.15 carat

⌀ 3.5 mm

0.03g

0.20 carat

⌀ 3.8 mm

0.04g

0.25 carat

⌀ 4.1 mm

0.05g

0.33 carat

⌀ 4.5 mm

0.066g

0.40 carat

⌀ 4.8 mm

0.08g

0.50 carat

⌀ 5.2 mm

0.1g

0.65 carat

⌀ 5.7 mm

0.13g

0.75 carat

⌀ 5.9 mm

0.15g

0.85 carat

⌀ 6.2 mm

0.17g

1.00 carat

⌀ 6.5 mm

0.2g

1.25 carat

⌀ 7 mm

0.25g

1.50 carat

⌀ 7.5 mm

0.3g

1.75 carat

⌀ 7.9 mm

0.35g

2.00 carat

⌀ 8.2 mm

0.4g

2.25 carat

⌀ 8.5 mm

0.45g

2.50 carat

⌀ 8.9 mm

0.5g

3.00 carat

⌀ 9.4 mm

0.6g

4.00 carat

⌀ 10.4 mm

0.8g

5.00 carat

⌀ 11.2 mm

1g

6.00 carat

⌀ 11.9 mm

1.2g

7.00 carat

⌀ 12.5 mm

1.4g

8.00 carat

⌀ 13 mm

1.6g

10.00 carat

⌀ 14.1 mm

2g

15.00 carat

⌀ 16.1 mm

3g

20.00 carat

⌀ 17.7 mm

4g

Round Diamond Sizes

Round Carat Weight Round MM Size Round Grams Weight
0.03 ct.⌀ 2 mm0.006g
0.05 ct.⌀ 2.4 mm0.01g
0.07 ct.⌀ 2.7 mm0.014g
0.1 ct.⌀ 3 mm0.02g
0.15 ct.⌀ 3.5 mm0.03g
0.2 ct.⌀ 3.8 mm0.04g
0.25 ct.⌀ 4.1 mm0.05g
0.33 ct.⌀ 4.5 mm0.066g
0.4 ct.⌀ 4.8 mm0.08g
0.5 ct.⌀ 5.2 mm0.1g
0.65 ct.⌀ 5.7 mm0.13g
0.75 ct.⌀ 5.9 mm0.15g
0.85 ct.⌀ 6.2 mm0.17g
1 ct.⌀ 6.5 mm0.2g
1.25 ct.⌀ 7 mm0.25g
Round Carat Weight Round MM Size Round Grams Weight
1.5 ct.⌀ 7.5 mm0.3g
1.75 ct.⌀ 7.9 mm0.35g
2 ct.⌀ 8.2 mm0.4g
2.25 ct.⌀ 8.5 mm0.45g
2.5 ct.⌀ 8.9 mm0.5g
3 ct.⌀ 9.4 mm0.6g
4 ct.⌀ 10.4 mm0.8g
5 ct.⌀ 11.2 mm1g
6 ct.⌀ 11.9 mm1.2g
7 ct.⌀ 12.5 mm1.4g
8 ct.⌀ 13 mm1.6g
10 ct.⌀ 14.1 mm2g
15 ct.⌀ 16.1 mm3g
20 ct.⌀ 17.7 mm4g

Oval Diamond Sizes

Oval Carat Weight Oval MM Size Oval Grams Weight
0.03 ct.2.4 mm × 1.7 mm0.006g
0.05 ct.2.9 mm × 2 mm0.01g
0.07 ct.3.3 mm × 2.3 mm0.014g
0.1 ct.3.6 mm × 2.5 mm0.02g
0.15 ct.4.2 mm × 2.9 mm0.03g
0.2 ct.4.6 mm × 3.2 mm0.04g
0.25 ct.4.9 mm × 3.4 mm0.05g
0.33 ct.5.5 mm × 3.8 mm0.066g
0.4 ct.5.8 mm × 4 mm0.08g
0.5 ct.6.2 mm × 4.3 mm0.1g
0.65 ct.6.8 mm × 4.7 mm0.13g
0.75 ct.7.2 mm × 5 mm0.15g
0.85 ct.7.5 mm × 5.2 mm0.17g
1 ct.7.9 mm × 5.5 mm0.2g
1.25 ct.8.5 mm × 5.9 mm0.25g
Oval Carat Weight Oval MM Size Oval Grams Weight
1.5 ct.9.1 mm × 6.3 mm0.3g
1.75 ct.9.5 mm × 6.6 mm0.35g
2 ct.9.9 mm × 6.9 mm0.4g
2.25 ct.10.4 mm × 7.2 mm0.45g
2.5 ct.10.7 mm × 7.4 mm0.5g
3 ct.11.4 mm × 7.9 mm0.6g
4 ct.12.5 mm × 8.7 mm0.8g
5 ct.13.5 mm × 9.4 mm1g
6 ct.14.4 mm × 10 mm1.2g
7 ct.15.1 mm × 10.5 mm1.4g
8 ct.15.8 mm × 11 mm1.6g
10 ct.17 mm × 11.8 mm2g
15 ct.19.4 mm × 13.5 mm3g
20 ct.21.5 mm × 14.9 mm4g

Princess Diamond Sizes

Princess Carat Weight Princess MM Size Princess Grams Weight
0.03 ct.1.7 mm × 1.7 mm0.006g
0.05 ct.2.1 mm × 2.1 mm0.01g
0.07 ct.2.3 mm × 2.3 mm0.014g
0.1 ct.2.6 mm × 2.6 mm0.02g
0.15 ct.3 mm × 3 mm0.03g
0.2 ct.3.3 mm × 3.3 mm0.04g
0.25 ct.3.5 mm × 3.5 mm0.05g
0.33 ct.3.9 mm × 3.9 mm0.066g
0.4 ct.4.1 mm × 4.1 mm0.08g
0.5 ct.4.4 mm × 4.4 mm0.1g
0.65 ct.4.8 mm × 4.8 mm0.13g
0.75 ct.5.1 mm × 5.1 mm0.15g
0.85 ct.5.3 mm × 5.3 mm0.17g
1 ct.5.6 mm × 5.6 mm0.2g
1.25 ct.6 mm × 6 mm0.25g
Princess Carat Weight Princess MM Size Princess Grams Weight
1.5 ct.6.4 mm × 6.4 mm0.3g
1.75 ct.6.7 mm × 6.7 mm0.35g
2 ct.7 mm × 7 mm0.4g
2.25 ct.7.3 mm × 7.3 mm0.45g
2.5 ct.7.6 mm × 7.6 mm0.5g
3 ct.8.1 mm × 8.1 mm0.6g
4 ct.8.9 mm × 8.9 mm0.8g
5 ct.9.6 mm × 9.6 mm1g
6 ct.10.2 mm × 10.2 mm1.2g
7 ct.10.7 mm × 10.7 mm1.4g
8 ct.11.2 mm × 11.2 mm1.6g
10 ct.12 mm × 12 mm2g
15 ct.13.8 mm × 13.8 mm3g
20 ct.15.2 mm × 15.2 mm4g

Cushion Diamond Sizes

Cushion Carat Weight Cushion MM Size Cushion Grams Weight
0.03 ct.1.7 mm × 1.7 mm0.006g
0.05 ct.2 mm × 2 mm0.01g
0.07 ct.2.3 mm × 2.3 mm0.014g
0.1 ct.2.6 mm × 2.6 mm0.02g
0.15 ct.2.9 mm × 2.9 mm0.03g
0.2 ct.3.2 mm × 3.2 mm0.04g
0.25 ct.3.5 mm × 3.5 mm0.05g
0.33 ct.3.8 mm × 3.8 mm0.066g
0.4 ct.4.1 mm × 4.1 mm0.08g
0.5 ct.4.4 mm × 4.4 mm0.1g
0.65 ct.4.8 mm × 4.8 mm0.13g
0.75 ct.5 mm × 5 mm0.15g
0.85 ct.5.3 mm × 5.3 mm0.17g
1 ct.5.5 mm × 5.5 mm0.2g
1.25 ct.6 mm × 6 mm0.25g
Cushion Carat Weight Cushion MM Size Cushion Grams Weight
1.5 ct.6.3 mm × 6.3 mm0.3g
1.75 ct.6.7 mm × 6.7 mm0.35g
2 ct.7 mm × 7 mm0.4g
2.25 ct.7.3 mm × 7.3 mm0.45g
2.5 ct.7.5 mm × 7.5 mm0.5g
3 ct.8 mm × 8 mm0.6g
4 ct.8.8 mm × 8.8 mm0.8g
5 ct.9.5 mm × 9.5 mm1g
6 ct.10.1 mm × 10.1 mm1.2g
7 ct.10.6 mm × 10.6 mm1.4g
8 ct.11.1 mm × 11.1 mm1.6g
10 ct.12 mm × 12 mm2g
15 ct.13.7 mm × 13.7 mm3g
20 ct.15.1 mm × 15.1 mm4g

Emerald Diamond Sizes

Emerald Carat Weight Emerald MM Size Emerald Grams Weight
0.03 ct.2.2 mm × 1.5 mm0.006g
0.05 ct.2.6 mm × 1.8 mm0.01g
0.07 ct.2.9 mm × 2 mm0.014g
0.1 ct.3.2 mm × 2.2 mm0.02g
0.15 ct.3.7 mm × 2.6 mm0.03g
0.2 ct.4 mm × 2.8 mm0.04g
0.25 ct.4.3 mm × 3 mm0.05g
0.33 ct.4.8 mm × 3.3 mm0.066g
0.4 ct.5.2 mm × 3.6 mm0.08g
0.5 ct.5.5 mm × 3.8 mm0.1g
0.65 ct.6 mm × 4.2 mm0.13g
0.75 ct.6.3 mm × 4.4 mm0.15g
0.85 ct.6.6 mm × 4.6 mm0.17g
1 ct.6.9 mm × 4.8 mm0.2g
1.25 ct.7.5 mm × 5.2 mm0.25g
Emerald Carat Weight Emerald MM Size Emerald Grams Weight
1.5 ct.7.9 mm × 5.5 mm0.3g
1.75 ct.8.4 mm × 5.8 mm0.35g
2 ct.8.8 mm × 6.1 mm0.4g
2.25 ct.9.1 mm × 6.3 mm0.45g
2.5 ct.9.4 mm × 6.5 mm0.5g
3 ct.10.1 mm × 7 mm0.6g
4 ct.11.1 mm × 7.7 mm0.8g
5 ct.11.8 mm × 8.2 mm1g
6 ct.12.7 mm × 8.8 mm1.2g
7 ct.13.2 mm × 9.2 mm1.4g
8 ct.13.8 mm × 9.6 mm1.6g
10 ct.15 mm × 10.4 mm2g
15 ct.17.1 mm × 11.9 mm3g
20 ct.18.9 mm × 13.1 mm4g

Radiant Diamond Sizes

Radiant Carat Weight Radiant MM Size Radiant Grams Weight
0.03 ct.2.1 mm × 1.7 mm0.006g
0.05 ct.2.5 mm × 2 mm0.01g
0.07 ct.2.9 mm × 2.3 mm0.014g
0.1 ct.3.1 mm × 2.5 mm0.02g
0.15 ct.3.6 mm × 2.9 mm0.03g
0.2 ct.4 mm × 3.2 mm0.04g
0.25 ct.4.4 mm × 3.5 mm0.05g
0.33 ct.4.8 mm × 3.8 mm0.066g
0.4 ct.5 mm × 4 mm0.08g
0.5 ct.5.4 mm × 4.3 mm0.1g
0.65 ct.5.9 mm × 4.7 mm0.13g
0.75 ct.6.3 mm × 5 mm0.15g
0.85 ct.6.5 mm × 5.2 mm0.17g
1 ct.6.9 mm × 5.5 mm0.2g
1.25 ct.7.4 mm × 5.9 mm0.25g
Radiant Carat Weight Radiant MM Size Radiant Grams Weight
1.5 ct.7.9 mm × 6.3 mm0.3g
1.75 ct.8.3 mm × 6.6 mm0.35g
2 ct.8.6 mm × 6.9 mm0.4g
2.25 ct.9 mm × 7.2 mm0.45g
2.5 ct.9.3 mm × 7.4 mm0.5g
3 ct.9.9 mm × 7.9 mm0.6g
4 ct.10.9 mm × 8.7 mm0.8g
5 ct.11.8 mm × 9.4 mm1g
6 ct.12.5 mm × 10 mm1.2g
7 ct.13.1 mm × 10.5 mm1.4g
8 ct.13.8 mm × 11 mm1.6g
10 ct.14.8 mm × 11.8 mm2g
15 ct.16.9 mm × 13.5 mm3g
20 ct.18.6 mm × 14.9 mm4g

Asscher Diamond Sizes

Asscher Carat Weight Asscher MM Size Asscher Grams Weight
0.03 ct.1.7 mm × 1.7 mm0.006g
0.05 ct.2 mm × 2 mm0.01g
0.07 ct.2.3 mm × 2.3 mm0.014g
0.1 ct.2.6 mm × 2.6 mm0.02g
0.15 ct.2.9 mm × 2.9 mm0.03g
0.2 ct.3.2 mm × 3.2 mm0.04g
0.25 ct.3.5 mm × 3.5 mm0.05g
0.33 ct.3.8 mm × 3.8 mm0.066g
0.4 ct.4.1 mm × 4.1 mm0.08g
0.5 ct.4.4 mm × 4.4 mm0.1g
0.65 ct.4.8 mm × 4.8 mm0.13g
0.75 ct.5 mm × 5 mm0.15g
0.85 ct.5.3 mm × 5.3 mm0.17g
1 ct.5.5 mm × 5.5 mm0.2g
1.25 ct.6 mm × 6 mm0.25g
Asscher Carat Weight Asscher MM Size Asscher Grams Weight
1.5 ct.6.3 mm × 6.3 mm0.3g
1.75 ct.6.7 mm × 6.7 mm0.35g
2 ct.7 mm × 7 mm0.4g
2.25 ct.7.3 mm × 7.3 mm0.45g
2.5 ct.7.5 mm × 7.5 mm0.5g
3 ct.8 mm × 8 mm0.6g
4 ct.8.8 mm × 8.8 mm0.8g
5 ct.9.5 mm × 9.5 mm1g
6 ct.10.1 mm × 10.1 mm1.2g
7 ct.10.6 mm × 10.6 mm1.4g
8 ct.11.1 mm × 11.1 mm1.6g
10 ct.12 mm × 12 mm2g
15 ct.13.7 mm × 13.7 mm3g
20 ct.15.1 mm × 15.1 mm4g

Marquise Diamond Sizes

Marquise Carat Weight Marquise MM Size Marquise Grams Weight
0.03 ct.3 mm × 1.5 mm0.006g
0.05 ct.3.6 mm × 1.8 mm0.01g
0.07 ct.4 mm × 2 mm0.014g
0.1 ct.4.6 mm × 2.3 mm0.02g
0.15 ct.5.2 mm × 2.6 mm0.03g
0.2 ct.5.8 mm × 2.9 mm0.04g
0.25 ct.6.2 mm × 3.1 mm0.05g
0.33 ct.6.8 mm × 3.4 mm0.066g
0.4 ct.7.4 mm × 3.7 mm0.08g
0.5 ct.7.8 mm × 3.9 mm0.1g
0.65 ct.8.6 mm × 4.3 mm0.13g
0.75 ct.9 mm × 4.5 mm0.15g
0.85 ct.9.4 mm × 4.7 mm0.17g
1 ct.10 mm × 5 mm0.2g
1.25 ct.10.6 mm × 5.3 mm0.25g
Marquise Carat Weight Marquise MM Size Marquise Grams Weight
1.5 ct.11.4 mm × 5.7 mm0.3g
1.75 ct.12 mm × 6 mm0.35g
2 ct.12.4 mm × 6.2 mm0.4g
2.25 ct.13 mm × 6.5 mm0.45g
2.5 ct.13.4 mm × 6.7 mm0.5g
3 ct.14.2 mm × 7.1 mm0.6g
4 ct.15.8 mm × 7.9 mm0.8g
5 ct.17 mm × 8.5 mm1g
6 ct.18 mm × 9 mm1.2g
7 ct.19 mm × 9.5 mm1.4g
8 ct.19.8 mm × 9.9 mm1.6g
10 ct.21.4 mm × 10.7 mm2g
15 ct.24.4 mm × 12.2 mm3g
20 ct.27 mm × 13.5 mm4g

Heart Diamond Sizes

Heart Carat Weight Heart MM Size Heart Grams Weight
0.03 ct.2 mm × 2 mm0.006g
0.05 ct.2.4 mm × 2.4 mm0.01g
0.07 ct.2.7 mm × 2.7 mm0.014g
0.1 ct.3 mm × 3 mm0.02g
0.15 ct.3.5 mm × 3.5 mm0.03g
0.2 ct.3.8 mm × 3.8 mm0.04g
0.25 ct.4.1 mm × 4.1 mm0.05g
0.33 ct.4.5 mm × 4.5 mm0.066g
0.4 ct.4.8 mm × 4.8 mm0.08g
0.5 ct.5.2 mm × 5.2 mm0.1g
0.65 ct.5.7 mm × 5.7 mm0.13g
0.75 ct.5.9 mm × 5.9 mm0.15g
0.85 ct.6.2 mm × 6.2 mm0.17g
1 ct.6.5 mm × 6.5 mm0.2g
1.25 ct.7 mm × 7 mm0.25g
Heart Carat Weight Heart MM Size Heart Grams Weight
1.5 ct.7.5 mm × 7.5 mm0.3g
1.75 ct.7.9 mm × 7.9 mm0.35g
2 ct.8.2 mm × 8.2 mm0.4g
2.25 ct.8.5 mm × 8.5 mm0.45g
2.5 ct.8.9 mm × 8.9 mm0.5g
3 ct.9.4 mm × 9.4 mm0.6g
4 ct.10.4 mm × 10.4 mm0.8g
5 ct.11.2 mm × 11.2 mm1g
6 ct.11.9 mm × 11.9 mm1.2g
7 ct.12.5 mm × 12.5 mm1.4g
8 ct.13 mm × 13 mm1.6g
10 ct.14.1 mm × 14.1 mm2g
15 ct.16.1 mm × 16.1 mm3g
20 ct.17.7 mm × 17.7 mm4g

Pear Diamond Sizes

Pear Carat Weight Pear MM Size Pear Grams Weight
0.03 ct.2.6 mm × 1.7 mm0.006g
0.05 ct.3.2 mm × 2.1 mm0.01g
0.07 ct.3.5 mm × 2.3 mm0.014g
0.1 ct.3.9 mm × 2.6 mm0.02g
0.15 ct.4.5 mm × 3 mm0.03g
0.2 ct.4.9 mm × 3.3 mm0.04g
0.25 ct.5.3 mm × 3.5 mm0.05g
0.33 ct.5.9 mm × 3.9 mm0.066g
0.4 ct.6.1 mm × 4.1 mm0.08g
0.5 ct.6.8 mm × 4.5 mm0.1g
0.65 ct.7.4 mm × 4.9 mm0.13g
0.75 ct.7.7 mm × 5.1 mm0.15g
0.85 ct.8 mm × 5.3 mm0.17g
1 ct.8.4 mm × 5.6 mm0.2g
1.25 ct.9.1 mm × 6.1 mm0.25g
Pear Carat Weight Pear MM Size Pear Grams Weight
1.5 ct.9.6 mm × 6.4 mm0.3g
1.75 ct.10.2 mm × 6.8 mm0.35g
2 ct.10.6 mm × 7.1 mm0.4g
2.25 ct.11.1 mm × 7.4 mm0.45g
2.5 ct.11.4 mm × 7.6 mm0.5g
3 ct.12.1 mm × 8.1 mm0.6g
4 ct.13.4 mm × 8.9 mm0.8g
5 ct.14.4 mm × 9.6 mm1g
6 ct.15.3 mm × 10.2 mm1.2g
7 ct.16.2 mm × 10.8 mm1.4g
8 ct.16.8 mm × 11.2 mm1.6g
10 ct.18.2 mm × 12.1 mm2g
15 ct.20.9 mm × 13.9 mm3g
20 ct.23 mm × 15.3 mm4g
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Size & Weight of Diamonds

Standard measurements for popular shapes

How big is a carat? Welcome to the Size & Weight of Diamonds page—your ultimate guide to understanding diamond sizes and weights! Discover carat sizes and visualize actual diamond sizes on screen, empowering you to make informed decisions when acquiring your diamond.

Our user-friendly, interactive diamond size charts and advanced diamond size-to-weight converter tool provide seamless estimations based on standard proportions. Keep in mind, estimations may vary for non-standard cuts. For any questions, feel free to contact our team via live chat.