The Diamond Size Chart

Actual sizes on screen for round diamonds

Select a shape to update the list

round

oval

princess

cushion

emerald

radiant

asscher

marquise

heart

pear

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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

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

15.00 carat

⌀ 16.1 mm

20.00 carat

⌀ 17.7 mm

Round Diamond Sizes

Round Carat Weight	Round MM Size	Round Grams Weight
0.03 ct.	⌀ 2 mm	0.006g
0.05 ct.	⌀ 2.4 mm	0.01g
0.07 ct.	⌀ 2.7 mm	0.014g
0.1 ct.	⌀ 3 mm	0.02g
0.15 ct.	⌀ 3.5 mm	0.03g
0.2 ct.	⌀ 3.8 mm	0.04g
0.25 ct.	⌀ 4.1 mm	0.05g
0.33 ct.	⌀ 4.5 mm	0.066g
0.4 ct.	⌀ 4.8 mm	0.08g
0.5 ct.	⌀ 5.2 mm	0.1g
0.65 ct.	⌀ 5.7 mm	0.13g
0.75 ct.	⌀ 5.9 mm	0.15g
0.85 ct.	⌀ 6.2 mm	0.17g
1 ct.	⌀ 6.5 mm	0.2g
1.25 ct.	⌀ 7 mm	0.25g

Round Carat Weight	Round MM Size	Round Grams Weight
1.5 ct.	⌀ 7.5 mm	0.3g
1.75 ct.	⌀ 7.9 mm	0.35g
2 ct.	⌀ 8.2 mm	0.4g
2.25 ct.	⌀ 8.5 mm	0.45g
2.5 ct.	⌀ 8.9 mm	0.5g
3 ct.	⌀ 9.4 mm	0.6g
4 ct.	⌀ 10.4 mm	0.8g
5 ct.	⌀ 11.2 mm	1g
6 ct.	⌀ 11.9 mm	1.2g
7 ct.	⌀ 12.5 mm	1.4g
8 ct.	⌀ 13 mm	1.6g
10 ct.	⌀ 14.1 mm	2g
15 ct.	⌀ 16.1 mm	3g
20 ct.	⌀ 17.7 mm	4g

Oval Diamond Sizes

Oval Carat Weight	Oval MM Size	Oval Grams Weight
0.03 ct.	2.4 mm × 1.7 mm	0.006g
0.05 ct.	2.9 mm × 2 mm	0.01g
0.07 ct.	3.3 mm × 2.3 mm	0.014g
0.1 ct.	3.6 mm × 2.5 mm	0.02g
0.15 ct.	4.2 mm × 2.9 mm	0.03g
0.2 ct.	4.6 mm × 3.2 mm	0.04g
0.25 ct.	4.9 mm × 3.4 mm	0.05g
0.33 ct.	5.5 mm × 3.8 mm	0.066g
0.4 ct.	5.8 mm × 4 mm	0.08g
0.5 ct.	6.2 mm × 4.3 mm	0.1g
0.65 ct.	6.8 mm × 4.7 mm	0.13g
0.75 ct.	7.2 mm × 5 mm	0.15g
0.85 ct.	7.5 mm × 5.2 mm	0.17g
1 ct.	7.9 mm × 5.5 mm	0.2g
1.25 ct.	8.5 mm × 5.9 mm	0.25g

Oval Carat Weight	Oval MM Size	Oval Grams Weight
1.5 ct.	9.1 mm × 6.3 mm	0.3g
1.75 ct.	9.5 mm × 6.6 mm	0.35g
2 ct.	9.9 mm × 6.9 mm	0.4g
2.25 ct.	10.4 mm × 7.2 mm	0.45g
2.5 ct.	10.7 mm × 7.4 mm	0.5g
3 ct.	11.4 mm × 7.9 mm	0.6g
4 ct.	12.5 mm × 8.7 mm	0.8g
5 ct.	13.5 mm × 9.4 mm	1g
6 ct.	14.4 mm × 10 mm	1.2g
7 ct.	15.1 mm × 10.5 mm	1.4g
8 ct.	15.8 mm × 11 mm	1.6g
10 ct.	17 mm × 11.8 mm	2g
15 ct.	19.4 mm × 13.5 mm	3g
20 ct.	21.5 mm × 14.9 mm	4g

Princess Diamond Sizes

Princess Carat Weight	Princess MM Size	Princess Grams Weight
0.03 ct.	1.7 mm × 1.7 mm	0.006g
0.05 ct.	2.1 mm × 2.1 mm	0.01g
0.07 ct.	2.3 mm × 2.3 mm	0.014g
0.1 ct.	2.6 mm × 2.6 mm	0.02g
0.15 ct.	3 mm × 3 mm	0.03g
0.2 ct.	3.3 mm × 3.3 mm	0.04g
0.25 ct.	3.5 mm × 3.5 mm	0.05g
0.33 ct.	3.9 mm × 3.9 mm	0.066g
0.4 ct.	4.1 mm × 4.1 mm	0.08g
0.5 ct.	4.4 mm × 4.4 mm	0.1g
0.65 ct.	4.8 mm × 4.8 mm	0.13g
0.75 ct.	5.1 mm × 5.1 mm	0.15g
0.85 ct.	5.3 mm × 5.3 mm	0.17g
1 ct.	5.6 mm × 5.6 mm	0.2g
1.25 ct.	6 mm × 6 mm	0.25g

Princess Carat Weight	Princess MM Size	Princess Grams Weight
1.5 ct.	6.4 mm × 6.4 mm	0.3g
1.75 ct.	6.7 mm × 6.7 mm	0.35g
2 ct.	7 mm × 7 mm	0.4g
2.25 ct.	7.3 mm × 7.3 mm	0.45g
2.5 ct.	7.6 mm × 7.6 mm	0.5g
3 ct.	8.1 mm × 8.1 mm	0.6g
4 ct.	8.9 mm × 8.9 mm	0.8g
5 ct.	9.6 mm × 9.6 mm	1g
6 ct.	10.2 mm × 10.2 mm	1.2g
7 ct.	10.7 mm × 10.7 mm	1.4g
8 ct.	11.2 mm × 11.2 mm	1.6g
10 ct.	12 mm × 12 mm	2g
15 ct.	13.8 mm × 13.8 mm	3g
20 ct.	15.2 mm × 15.2 mm	4g

Cushion Diamond Sizes

Cushion Carat Weight	Cushion MM Size	Cushion Grams Weight
0.03 ct.	1.7 mm × 1.7 mm	0.006g
0.05 ct.	2 mm × 2 mm	0.01g
0.07 ct.	2.3 mm × 2.3 mm	0.014g
0.1 ct.	2.6 mm × 2.6 mm	0.02g
0.15 ct.	2.9 mm × 2.9 mm	0.03g
0.2 ct.	3.2 mm × 3.2 mm	0.04g
0.25 ct.	3.5 mm × 3.5 mm	0.05g
0.33 ct.	3.8 mm × 3.8 mm	0.066g
0.4 ct.	4.1 mm × 4.1 mm	0.08g
0.5 ct.	4.4 mm × 4.4 mm	0.1g
0.65 ct.	4.8 mm × 4.8 mm	0.13g
0.75 ct.	5 mm × 5 mm	0.15g
0.85 ct.	5.3 mm × 5.3 mm	0.17g
1 ct.	5.5 mm × 5.5 mm	0.2g
1.25 ct.	6 mm × 6 mm	0.25g

Cushion Carat Weight	Cushion MM Size	Cushion Grams Weight
1.5 ct.	6.3 mm × 6.3 mm	0.3g
1.75 ct.	6.7 mm × 6.7 mm	0.35g
2 ct.	7 mm × 7 mm	0.4g
2.25 ct.	7.3 mm × 7.3 mm	0.45g
2.5 ct.	7.5 mm × 7.5 mm	0.5g
3 ct.	8 mm × 8 mm	0.6g
4 ct.	8.8 mm × 8.8 mm	0.8g
5 ct.	9.5 mm × 9.5 mm	1g
6 ct.	10.1 mm × 10.1 mm	1.2g
7 ct.	10.6 mm × 10.6 mm	1.4g
8 ct.	11.1 mm × 11.1 mm	1.6g
10 ct.	12 mm × 12 mm	2g
15 ct.	13.7 mm × 13.7 mm	3g
20 ct.	15.1 mm × 15.1 mm	4g

Emerald Diamond Sizes

Emerald Carat Weight	Emerald MM Size	Emerald Grams Weight
0.03 ct.	2.2 mm × 1.5 mm	0.006g
0.05 ct.	2.6 mm × 1.8 mm	0.01g
0.07 ct.	2.9 mm × 2 mm	0.014g
0.1 ct.	3.2 mm × 2.2 mm	0.02g
0.15 ct.	3.7 mm × 2.6 mm	0.03g
0.2 ct.	4 mm × 2.8 mm	0.04g
0.25 ct.	4.3 mm × 3 mm	0.05g
0.33 ct.	4.8 mm × 3.3 mm	0.066g
0.4 ct.	5.2 mm × 3.6 mm	0.08g
0.5 ct.	5.5 mm × 3.8 mm	0.1g
0.65 ct.	6 mm × 4.2 mm	0.13g
0.75 ct.	6.3 mm × 4.4 mm	0.15g
0.85 ct.	6.6 mm × 4.6 mm	0.17g
1 ct.	6.9 mm × 4.8 mm	0.2g
1.25 ct.	7.5 mm × 5.2 mm	0.25g

Emerald Carat Weight	Emerald MM Size	Emerald Grams Weight
1.5 ct.	7.9 mm × 5.5 mm	0.3g
1.75 ct.	8.4 mm × 5.8 mm	0.35g
2 ct.	8.8 mm × 6.1 mm	0.4g
2.25 ct.	9.1 mm × 6.3 mm	0.45g
2.5 ct.	9.4 mm × 6.5 mm	0.5g
3 ct.	10.1 mm × 7 mm	0.6g
4 ct.	11.1 mm × 7.7 mm	0.8g
5 ct.	11.8 mm × 8.2 mm	1g
6 ct.	12.7 mm × 8.8 mm	1.2g
7 ct.	13.2 mm × 9.2 mm	1.4g
8 ct.	13.8 mm × 9.6 mm	1.6g
10 ct.	15 mm × 10.4 mm	2g
15 ct.	17.1 mm × 11.9 mm	3g
20 ct.	18.9 mm × 13.1 mm	4g

Radiant Diamond Sizes

Radiant Carat Weight	Radiant MM Size	Radiant Grams Weight
0.03 ct.	2.1 mm × 1.7 mm	0.006g
0.05 ct.	2.5 mm × 2 mm	0.01g
0.07 ct.	2.9 mm × 2.3 mm	0.014g
0.1 ct.	3.1 mm × 2.5 mm	0.02g
0.15 ct.	3.6 mm × 2.9 mm	0.03g
0.2 ct.	4 mm × 3.2 mm	0.04g
0.25 ct.	4.4 mm × 3.5 mm	0.05g
0.33 ct.	4.8 mm × 3.8 mm	0.066g
0.4 ct.	5 mm × 4 mm	0.08g
0.5 ct.	5.4 mm × 4.3 mm	0.1g
0.65 ct.	5.9 mm × 4.7 mm	0.13g
0.75 ct.	6.3 mm × 5 mm	0.15g
0.85 ct.	6.5 mm × 5.2 mm	0.17g
1 ct.	6.9 mm × 5.5 mm	0.2g
1.25 ct.	7.4 mm × 5.9 mm	0.25g

Radiant Carat Weight	Radiant MM Size	Radiant Grams Weight
1.5 ct.	7.9 mm × 6.3 mm	0.3g
1.75 ct.	8.3 mm × 6.6 mm	0.35g
2 ct.	8.6 mm × 6.9 mm	0.4g
2.25 ct.	9 mm × 7.2 mm	0.45g
2.5 ct.	9.3 mm × 7.4 mm	0.5g
3 ct.	9.9 mm × 7.9 mm	0.6g
4 ct.	10.9 mm × 8.7 mm	0.8g
5 ct.	11.8 mm × 9.4 mm	1g
6 ct.	12.5 mm × 10 mm	1.2g
7 ct.	13.1 mm × 10.5 mm	1.4g
8 ct.	13.8 mm × 11 mm	1.6g
10 ct.	14.8 mm × 11.8 mm	2g
15 ct.	16.9 mm × 13.5 mm	3g
20 ct.	18.6 mm × 14.9 mm	4g

Asscher Diamond Sizes

Asscher Carat Weight	Asscher MM Size	Asscher Grams Weight
0.03 ct.	1.7 mm × 1.7 mm	0.006g
0.05 ct.	2 mm × 2 mm	0.01g
0.07 ct.	2.3 mm × 2.3 mm	0.014g
0.1 ct.	2.6 mm × 2.6 mm	0.02g
0.15 ct.	2.9 mm × 2.9 mm	0.03g
0.2 ct.	3.2 mm × 3.2 mm	0.04g
0.25 ct.	3.5 mm × 3.5 mm	0.05g
0.33 ct.	3.8 mm × 3.8 mm	0.066g
0.4 ct.	4.1 mm × 4.1 mm	0.08g
0.5 ct.	4.4 mm × 4.4 mm	0.1g
0.65 ct.	4.8 mm × 4.8 mm	0.13g
0.75 ct.	5 mm × 5 mm	0.15g
0.85 ct.	5.3 mm × 5.3 mm	0.17g
1 ct.	5.5 mm × 5.5 mm	0.2g
1.25 ct.	6 mm × 6 mm	0.25g

Asscher Carat Weight	Asscher MM Size	Asscher Grams Weight
1.5 ct.	6.3 mm × 6.3 mm	0.3g
1.75 ct.	6.7 mm × 6.7 mm	0.35g
2 ct.	7 mm × 7 mm	0.4g
2.25 ct.	7.3 mm × 7.3 mm	0.45g
2.5 ct.	7.5 mm × 7.5 mm	0.5g
3 ct.	8 mm × 8 mm	0.6g
4 ct.	8.8 mm × 8.8 mm	0.8g
5 ct.	9.5 mm × 9.5 mm	1g
6 ct.	10.1 mm × 10.1 mm	1.2g
7 ct.	10.6 mm × 10.6 mm	1.4g
8 ct.	11.1 mm × 11.1 mm	1.6g
10 ct.	12 mm × 12 mm	2g
15 ct.	13.7 mm × 13.7 mm	3g
20 ct.	15.1 mm × 15.1 mm	4g

Marquise Diamond Sizes

Marquise Carat Weight	Marquise MM Size	Marquise Grams Weight
0.03 ct.	3 mm × 1.5 mm	0.006g
0.05 ct.	3.6 mm × 1.8 mm	0.01g
0.07 ct.	4 mm × 2 mm	0.014g
0.1 ct.	4.6 mm × 2.3 mm	0.02g
0.15 ct.	5.2 mm × 2.6 mm	0.03g
0.2 ct.	5.8 mm × 2.9 mm	0.04g
0.25 ct.	6.2 mm × 3.1 mm	0.05g
0.33 ct.	6.8 mm × 3.4 mm	0.066g
0.4 ct.	7.4 mm × 3.7 mm	0.08g
0.5 ct.	7.8 mm × 3.9 mm	0.1g
0.65 ct.	8.6 mm × 4.3 mm	0.13g
0.75 ct.	9 mm × 4.5 mm	0.15g
0.85 ct.	9.4 mm × 4.7 mm	0.17g
1 ct.	10 mm × 5 mm	0.2g
1.25 ct.	10.6 mm × 5.3 mm	0.25g

Marquise Carat Weight	Marquise MM Size	Marquise Grams Weight
1.5 ct.	11.4 mm × 5.7 mm	0.3g
1.75 ct.	12 mm × 6 mm	0.35g
2 ct.	12.4 mm × 6.2 mm	0.4g
2.25 ct.	13 mm × 6.5 mm	0.45g
2.5 ct.	13.4 mm × 6.7 mm	0.5g
3 ct.	14.2 mm × 7.1 mm	0.6g
4 ct.	15.8 mm × 7.9 mm	0.8g
5 ct.	17 mm × 8.5 mm	1g
6 ct.	18 mm × 9 mm	1.2g
7 ct.	19 mm × 9.5 mm	1.4g
8 ct.	19.8 mm × 9.9 mm	1.6g
10 ct.	21.4 mm × 10.7 mm	2g
15 ct.	24.4 mm × 12.2 mm	3g
20 ct.	27 mm × 13.5 mm	4g

Heart Diamond Sizes

Heart Carat Weight	Heart MM Size	Heart Grams Weight
0.03 ct.	2 mm × 2 mm	0.006g
0.05 ct.	2.4 mm × 2.4 mm	0.01g
0.07 ct.	2.7 mm × 2.7 mm	0.014g
0.1 ct.	3 mm × 3 mm	0.02g
0.15 ct.	3.5 mm × 3.5 mm	0.03g
0.2 ct.	3.8 mm × 3.8 mm	0.04g
0.25 ct.	4.1 mm × 4.1 mm	0.05g
0.33 ct.	4.5 mm × 4.5 mm	0.066g
0.4 ct.	4.8 mm × 4.8 mm	0.08g
0.5 ct.	5.2 mm × 5.2 mm	0.1g
0.65 ct.	5.7 mm × 5.7 mm	0.13g
0.75 ct.	5.9 mm × 5.9 mm	0.15g
0.85 ct.	6.2 mm × 6.2 mm	0.17g
1 ct.	6.5 mm × 6.5 mm	0.2g
1.25 ct.	7 mm × 7 mm	0.25g

Heart Carat Weight	Heart MM Size	Heart Grams Weight
1.5 ct.	7.5 mm × 7.5 mm	0.3g
1.75 ct.	7.9 mm × 7.9 mm	0.35g
2 ct.	8.2 mm × 8.2 mm	0.4g
2.25 ct.	8.5 mm × 8.5 mm	0.45g
2.5 ct.	8.9 mm × 8.9 mm	0.5g
3 ct.	9.4 mm × 9.4 mm	0.6g
4 ct.	10.4 mm × 10.4 mm	0.8g
5 ct.	11.2 mm × 11.2 mm	1g
6 ct.	11.9 mm × 11.9 mm	1.2g
7 ct.	12.5 mm × 12.5 mm	1.4g
8 ct.	13 mm × 13 mm	1.6g
10 ct.	14.1 mm × 14.1 mm	2g
15 ct.	16.1 mm × 16.1 mm	3g
20 ct.	17.7 mm × 17.7 mm	4g

Pear Diamond Sizes

Pear Carat Weight	Pear MM Size	Pear Grams Weight
0.03 ct.	2.6 mm × 1.7 mm	0.006g
0.05 ct.	3.2 mm × 2.1 mm	0.01g
0.07 ct.	3.5 mm × 2.3 mm	0.014g
0.1 ct.	3.9 mm × 2.6 mm	0.02g
0.15 ct.	4.5 mm × 3 mm	0.03g
0.2 ct.	4.9 mm × 3.3 mm	0.04g
0.25 ct.	5.3 mm × 3.5 mm	0.05g
0.33 ct.	5.9 mm × 3.9 mm	0.066g
0.4 ct.	6.1 mm × 4.1 mm	0.08g
0.5 ct.	6.8 mm × 4.5 mm	0.1g
0.65 ct.	7.4 mm × 4.9 mm	0.13g
0.75 ct.	7.7 mm × 5.1 mm	0.15g
0.85 ct.	8 mm × 5.3 mm	0.17g
1 ct.	8.4 mm × 5.6 mm	0.2g
1.25 ct.	9.1 mm × 6.1 mm	0.25g

Pear Carat Weight	Pear MM Size	Pear Grams Weight
1.5 ct.	9.6 mm × 6.4 mm	0.3g
1.75 ct.	10.2 mm × 6.8 mm	0.35g
2 ct.	10.6 mm × 7.1 mm	0.4g
2.25 ct.	11.1 mm × 7.4 mm	0.45g
2.5 ct.	11.4 mm × 7.6 mm	0.5g
3 ct.	12.1 mm × 8.1 mm	0.6g
4 ct.	13.4 mm × 8.9 mm	0.8g
5 ct.	14.4 mm × 9.6 mm	1g
6 ct.	15.3 mm × 10.2 mm	1.2g
7 ct.	16.2 mm × 10.8 mm	1.4g
8 ct.	16.8 mm × 11.2 mm	1.6g
10 ct.	18.2 mm × 12.1 mm	2g
15 ct.	20.9 mm × 13.9 mm	3g
20 ct.	23 mm × 15.3 mm	4g

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.