stone

Since the varying densities of different stone materials and also the varying depths of different cutting styles can result in a significantly different, even between stones with a similar carat weight. 

Estimating Weights for Standard Faceted Cut Diamond

Rounds		Squares / Princess		Ovals
Size	Weight	Size	Weight	Size	Weight
1.6 mm	.02 carat	2 mm	.05 carat	5 x 3 mm	.25 carat
2 mm	.03 carat	2.5 mm	.09 carat	6 x 4 mm	.5 carat
2.5 mm	.06 carat	3 mm	.16 carat	7 x 5 mm	.75 carat
3 mm	.10 carat	3.5 mm	.25 carat	8 x 6 mm	1.0 carat
3.5 mm	.16 carat	4 mm	.33 carat	9 x 7 mm	1.5 carat
4 mm	.25 carat	4.5 mm	.50 carat	10 x 8 mm	2.16 carat
4.5 mm	.33 carat	5 mm	.75 carat	11 x 9 mm	3.5 carat
5 mm	.50 carat	5.5 mm	1.0 carat	12 x 10 mm	4.25 carat
5.5 mm	.62 carat	6 mm	1.25 carat	14 x 10 mm	6.0 carat
6 mm	.75 carat	6.5 mm	1.5 carat	14 x 12 mm	8.0 carat
6.5 mm	1.0 carat	7 mm	2.0 carat	16 x 12 mm	9.33 carat
7 mm	1.25 carat	7.5 mm	2.5 carat	18 x 13 mm	14.2 carat
7.5 mm	1.62 carat	8 mm	3.0 carat
8 mm	2.0 carat	8.5 mm	3.75 carat
8.5 mm	2.33 carat	9 mm	4.0 carat
9 mm	2.9 carat	9.5 mm	5.0 carat
9.5mm	3.25 carat	10 mm	5.5 carat
10 mm	3.75 carat	10.5 mm	6.0 carat
10.5 mm	4.5 carat	11 mm	7.5 carat
11 mm	5.0 carat	12 mm	9.5 carat
11.5 mm	5.375 carat	13 mm	13.2 carat
12 mm	6.125 carat	14 mm	16.5 carat
13 mm	7.75 carat	15 mm	20.25 carat
14 mm	9.75 carat	16 mm	24.6 carat
15 mm	11.85 carat
16 mm	16 carat
17 mm	17.25 carat
8 mm	20.5 carat
19 mm	24.0 carat
20 mm	28.0 carat
21 mm	34.8 carat
22 mm	41.8 carat

 

Emerald		Pear		Marquise
Size	Weight	Size	Weight	Size	Weight
5 x 3 mm	.33 carat	3 x 2 mm	.05 carat	4 x 2 mm	.08 carat
6 x 4 mm	.625 carat	4 x 3 mm	.14 carat	5 x 2.5 mm	.15 carat
7 x 5 mm	1.25 carat	5 x 3 mm	.2 carat	5 x 3 mm	.20 carat
8 x 6 mm	1.75 carat	6 x 4 mm	.33 carat	6 x 3 mm	.25 carat
9 x 7 mm	2.5 carat	7 x 5 mm	.5 carat	8 x 4 mm	.50 carat
10 x 8 mm	3.75 carat	8 x 5 mm	.9 carat	9 x 5 mm	.75 carat
11 x 9 mm	4.75 carat	9 x 6 mm	1.5 carat	10 x 5 mm	.9 carat
12 x 10 mm	5.0 carat	10 x 7 mm	1.75 carat	11 X 5.5 mm	1.12 carat
14 x 10 mm	8.5 carat	11 x 7 mm	2 carat	12 x 6 mm	2.0 carat
14 x 12 mm	9.0 carat	12 x 8 mm	3.0 carat	14 x 7 mm	3.0 carat
16 x 12 mm	10.5 carat	13 x 9 mm	3.5 carat	16 x 8 mm	4.0 carat
18 x 13 mm	14.2 carat	15 x 10 mm	5 carat	18 x 9 mm	6.0 carat
20 x 15 mm	20.3 carat	16 x 12 mm	8.6 carat	20 x 10 mm	8.5 carat
25 x 18 mm	52.2 carat	18 x 12 mm	9.3 carat
25 x 18 mm	30.6 carat	20 x 15 mm	18 carat
30 x 22 mm	54.5 carat	22 x 16 mm	23 carat
		23 x 17 mm	25 carat
		25 x 18mm	27 carat
		27 x 20mm	30 carat
		30 x 22mm	34 carat

 

Cushion		Heart		Asscher
Size	Weight	Size	Weight	Size	Weight
4 x 4 mm	.375 carat	4 x 4 mm	.25 carat	3 x 3 mm	.16 carat
4.5 x 4.5 mm	.5 carat	5 x 5 mm	.5 carat	3.5 x 3.5 mm	.25 carat
5 x 5 mm	.625 carat	6 x 6 mm	.75 carat	4 x 4 mm	.33 carat
5.5 x 5.5 mm	.75 carat	6.5 x& 6..5 mm	1.0 carat	4.5 x 4.5 mm	.5 carat
6 x 6 mm	1.25 carat	7 x 7 mm	1.5 carat	5 x 5 mm	.75 carat
6.5 x 6..5 mm	1.5 carat	8 x 8 mm	2.0 carat	5.5 x 5.5 mm	1.0 carat
7 x 7 mm	2.0 carat	9 x 9 mm	3.0 carat	5.9 x 5.9 mm	1.33 carat
8 x 6 mm	2.0 carat	10 x 10 mm	4.0 carat	6 x 6 mm	1.25 carat
8 x 8 mm	2.9 carat	11 x 11 mm	5.0 carat	6.25 x 6.25 mm	1.37 carat
9 x 7 mm	2.5 carat	12 x 12 mm	5.66 carat	6.5 x 6.5mm	1.5 carat
10 x 8 mm	4.0 carat	15 x 15 mm	10.75 carat	6.6 x 6.6 mm	1.75 carat
12 x 10 mm	7.5 carat	16 x 16 mm	13.25 carat	7 x 7 mm	2.0 carat
14 x 10 mm	9.5 carat	18 x 18 mm	15.33 carat	8 x 8 mm	3.0 carat