Stone Carat Conversion Chart

All Sizes are approximate measurements for Diamond Weights - sizes varies. Reminder than colored stone may not be the same size. Choose your mounting by mm size not cart weight.
Carat Weight	Round mm	Pear mm	Marquise mm	Heart mm	Emerald mm	Princess mm	Oval mm
.02 ct.	1.75 mm
.03 ct.	2.0 mm
.05 ct.	2.4 mm
.07 ct.	2.7 mm
.10 ct.	3.0 mm		4.5 x 2.5	3 x 3		2.2 x 2.2
.12 ct.	3.2 mm
.15 ct.	3.4 mm
.20 ct.	3.8 mm
.25 ct.	4.1 mm	5.5 x 3.5	6.5 x 3.5	4 x 4	5 x 3		5 x 3
.30 ct.	4.2 mm
.35 ct.	4.5 mm
.40 ct.	4.8 mm					4 x 4
.50 ct.	5.2 mm	6 x 4	8.5 x 4	5 x 5	6 x 4		6 x 4
.65 ct.	5.6 mm			5.5 x 5.5
.75 ct.	5.9 mm	7 x 5		6 x 6		5 x 5
.85 ct.	6.2 mm
1.00 ct.	6.5 mm	9 x 5.5	10.5 x 5	6.5 x 6.5	7 x 5	6 x 6	7 x 5
1.25 ct.	7.0 mm						7.5 x 5.5
1.50 ct.	7.5 mm	10 x 6		7 x 7	8 x 6	7 x 7	8 x 6
1.75 ct.	7.8 mm
2.00 ct.	8.2 mm	11 x 7	13 x 6.5	8 x 8	9 x 7	8 x 8	8.5 x 6.5
2.25 ct.	8.6 mm
2.50 ct.	9.0 mm			8.5 x 8.5			9 x 7
3.00 ct.	9.5 mm		14 x 7	9 x 9	10 x 8	9 x 9	10 x 8
3.50 ct.	9.5 mm	13.5 x 8.5		9.5 x 9.5
4.00 ct.	10.1 mm			10 x 10	11 x 9		11 x 9
4.50 ct.	10.7 mm			10.5 x 10.5
5.00 ct.	11.2 mm	15 x 9.5		11 x 11	13 x 8	11 x 11	12 x 10
6.00 ct.	11.7 mm
7.00 ct.	12.4 mm
8.00 ct.	13 mm						14 x 10

Stone Carat Conversion