Carat size-weight

Carat is a widely accepted measurement of gem weight.  Diamond simulants such as those used in Desert Diamonds jewelry are heavier than natural carbon diamonds due to their chemical composition.   A 1ct diamond simulant will look smaller than a 1ct carbon diamond, and a 2 carat brilliant Desert Diamonds simulant would appear to be the same size as a 1.25 carat brilliant carbon diamond.  In other words, Desert Diamond simulants are 1.7 times the expected weight of an equivalently sized diamond, or one of our simulants is about 75% heavier than diamond. Diamond size does not increase proportionally with their carat weight.

To make a visual comparison between diamond simulants and carbon diamonds, it is easier to use dimensions in millimeters as a point of reference.

As an example, a 1.75ct round brilliant diamond simulant has a diameter of 6.5mm and appears the same as a 1ct carbon diamond.
 

This varies slightly according to the cut of the stone.  Below is an overview of shapes, weight and sizes.

Stone cut
Simulant
 carat size
Stone size
in mm
Carbon diamond
carat size
Brilliant
0.125ct
2.3mm
 
 
 0.25ct
3.25mm
0.125ct
 
0.5ct
4.25mm
0.3ct
 
1ct
5.25mm
0.5ct
 
1.5ct
6mm
0.75-0.8ct
 
1.75ct
6.5mm
1ct
 
2ct
6.75mm
1.2ct
 
3ct
7.75mm
1.75ct
 
4ct
8.5mm
2.25ct
 
5ct
9.25mm
2.75ct
 
6ct
10mm
3.5ct
Emerald
0.5ct
3 x 5mm
0.25ct
 
1ct
4 x 5.5mm
0.5ct
 
2ct
5 x 7mm
1ct
 
3ct
6 x 8mm
1.5ct
 
4ct
7 x 9mm
2.5ct
 
6ct
8 x 10mm
4ct
Heart
1ct
5 x 5mm
0.5ct
 
2ct
6.5 x 6.5mm
1ct
 
3ct
7 x 7mm
1.5ct
 
4
8x8mm
2ct
Marquise
1ct
4 x 8mm
0.5ct
 
2ct
5 x 10mm
1ct
 
4ct
7 x 14mm
3ct
Oval
1ct
4 x 6mm
0.4ct
 
2ct
6 x 8mm
1.25ct
 
3ct
7 x 9mm
1.75ct
Princess
0.5ct
3 x 3mm
0.25ct
 
1ct
4.5 x 4.5mm
0.5ct
 
2ct
5.5 x 5.5mm
1ct
 
3ct
6.5 x 6.5mm
1.5ct
 
4ct
7 x 7mm
2ct
 
6
9 x 9mm
3ct
Teardrop
1ct
4.5 x 6mm
0.5ct
 
2ct
6 x 9mm
1.5ct
 
3ct
7 x 10mm
2ct
Trillion
1ct
4.5 x 4.5mm
0.4ct
 
2ct
5.5 x 5.5mm
0.8ct