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Stone Carat Conversion

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