PHONE (508) 672-1390

Diamond carat weight

Carat Weight

The size of a diamond is measured, not by its dimensions, but by weight. One carat, the traditional unit of measure for diamonds, is equal to approximately 0.2 grams. You may also hear the weight of a diamond referred to in points. A point is equal to 1/100 of a carat; therefore, a 75-point diamond equals 0.75 carat. Diamonds of equal weight may appear slightly different in size, depending on their depth and proportions.

Because they are quite rare, larger diamonds of gem quality are much more valuable.

 

STONE TO 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 carat 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