Conversion Chart : C.Z. vs. Diamond
( Size in mm., Weight in carat)

Round

SIZE	C.Z. weight	Diamond weight
1.25	0.013	0.010
1.50	0.023	0.015
1.75	0.037	0.020
2.00	0.06	0.03
2.25	0.08	0.04
2.50	0.10	0.05
2.75	0.15	0.08
3.00	0.18	0.11
3.25	0.24	0.14
3.50	0.29	0.17
3.75	0.36	0.21
4.00	0.43	0.25
4.25	0.48	0.28
4.50	0.61	0.36
4.75	0.74	0.44
5.00	0.79	0.46
5.25	0.95	0.56
5.50	1.13	0.66
5.75	1.30	0.76
6.00	1.43	0.84
6.25	1.58	0.93
6.50	1.75	1.03
6.75	2.11	1.24
7.00	2.17	1.28
7.25	2.53	1.49
7.50	2.84	1.67
7.75	2.97	1.75
8.00	3.46	2.04
8.25	3.58	2.11
8.50	4.13	2.43
8.75	4.34	2.55
9.00	4.68	2.75
9.25	5.18	3.05
9.50	5.69	3.35
9.75	6.13	3.61
10.00	6.58	3.87
10.25	7.08	4.16
10.50	7.50	4.41
10.75	7.55	4.44
11.00	8.35	4.91
11.25	9.34	5.49
11.50	9.94	5.85
12.00	11.62	6.84
12.25	12.34	7.26
12.50	12.52	7.36
12.75	12.78	7.52
13.00	14.47	8.51
13.50	16.20	9.53
14.00	17.84	10.49
15.00	21.92	12.89
16.00	27.25	16.03
17.00	33.55	19.74
18.00	38.60	22.71
19.00	41.78	24.58
20.00	50.22	29.54
22.00	67.43	39.66
25.00	99.18	58.34
30.00	181.77	106.92
40.00	374.15	220.09

Oval

SIZE	C.Z. weight	Diamond weight
5 x 3	0.35	0.21
5 x 4	0.55	0.32
6 x 4	0.73	0.43
6 x 5	1.04	0.61
7 x 5	1.30	0.76
7.5 x 5.5	1.67	0.98
8 x 6	2.06	1.21
9 x 6	2.40	1.41
9 x 7	3.16	1.86
10 x 8	4.31	2.54
12 x 8	5.09	2.99
10.5 x 8.5	4.90	2.88
11 x 9	6.54	3.85
12 x 10	8.59	5.05
14 x 10	9.87	5.81
13 x 11	10.28	6.05
14 x 12	13.96	8.21
15 x 12	14.89	8.76
16 x 12	15.84	9.32
18 x 13	21.86	12.86
20 x 15	32.17	18.92
22 x 16	40.84	24.02

Heart

SIZE	C.Z. weight	Diamond weight
4.00	0.40	0.24
4.50	0.57	0.34
5.00	0.75	0.44
5.50	1.03	0.61
6.00	1.25	0.74
6.25	1.41	0.83
6.50	1.58	0.93
7.00	1.92	1.13
7.50	2.71	1.59
8.00	2.90	1.71
9.00	4.10	2.41
9.50	4.93	2.90
10.00	5.38	3.16
11.00	7.50	4.41
12.00	9.63	5.66
13.00	13.40	7.88
14.00	15.95	9.38
15.00	18.34	10.79
16.00	22.56	13.27
18.00	35.50	20.88
20.00	42.01	24.71

Pear

SIZE	C.Z. weight	Diamond weight
5x4	0.60	0.35
6 x 4	0.67	0.39
6.50 x 4.50	0.97	0.57
7 x 5	1.21	0.71
8 x 5	1.38	0.81
8.5 x 5.5	1.83	1.08
9 x 6	2.26	1.33
9 x 7	2.98	1.75
10 x 7	3.06	1.80
10 x 8	4.19	2.46
11 x 7.50	4.44	2.61
11 x 8	5.10	3.00
12 x 8	5.06	2.98
12 x 9	5.85	3.44
13 x 8	5.04	2.98
14 x 8	5.90	3.47
13 x 9	6.99	4.11
14 x 9	7.01	4.12
15 x 9	8.60	5.06
14 x 10	9.20	5.41
13 x 11	9.61	5.65
15 x 10	9.78	5.75
16 x 10	10.66	6.27
17 x 10	10.99	6.46
15 x 11	12.52	7.36
17 x 11	13.68	8.05
18 x 11	13.84	8.14
16 x 12	15.29	8.99
18 x 12	15.90	9.35
18.5 x 12	17.90	10.53
18 x 13	19.83	11.66
19 x 12	17.00	10.00
19 x 13	20.79	12.23
20 x 14	24.92	14.66
23 x 13	25.89	15.23
22 x 14	26.30	15.47
20 x 15	28.65	16.85
23 x 14	26.00	15.29
25 x 15	30.02	17.66
25 x 20	64.00	37.65

Marquise

SIZE	C.Z. weight	Diamond weight
4 x 2	0.15	0.08
5 x 2.5	0.24	0.14
6 x 3	0.41	0.24
6.5 x 3.5	0.53	0.31
7 x 3.5	0.60	0.35
8 x 3.5	0.69	0.41
8 x 4	0.80	0.47
9 x 4.5	1.20	0.71
10 x 5	1.62	0.95
11 x 5.5	2.12	1.25
12 x 6	2.75	1.62
13 x 6.5	3.60	2.11
14 x 7	4.22	2.48
15 x 7.5	5.25	3.09
16 x 8	6.57	3.86
17 x 8.5	8.30	4.88
18 x 9	9.61	5.65
20 x 10	13.49	7.94
22 x 11	16.28	9.58
30 x 15	36.50	21.00

Emerald

SIZE	C.Z. weight	Diamond weight
5 x 3	0.50	0.29
6 x 4	1.13	0.66
6.5 x 4.5	1.49	0.88
7 x 5	1.81	1.06
8 x 6	2.95	1.74
8.5 x 6.5	3.69	2.17
9 x 7	4.46	2.62
9.5 x 7.5	5.46	3.21
10 x 8	6.44	3.79
12 x 8	8.13	4.78
11 x 9	8.85	5.21
13 x 9	10.84	6.38
12 x 10	11.82	6.95
14 x 10	14.42	8.48
13 x 11	15.52	9.13
14 x 12	19.15	11.26
15 x 11	19.51	11.48
16 x 12	24.18	14.22
18 x 13	32.86	19.33
20 x 15	44.03	25.90

Quadrillion / Princess

SIZE	C.Z. weight	Diamond weight
3.00	0.30	0.18
3.25	0.44	0.26
3.50	0.50	0.29
3.75	0.53	0.31
4.00	0.66	0.39
4.25	0.74	0.44
4.50	0.95	0.56
4.75	1.08	0.64
5.00	1.21	0.71
5.50	1.68	0.99
6.00	2.10	1.24
6.50	2.71	1.59
7.00	3.33	1.96
7.50	4.08	2.40
7.75	4.66	2.74
8.00	5.12	3.01
8.25	5.50	3.24
8.50	6.24	3.67
8.75	6.97	4.10
9.00	7.01	4.12
9.50	8.65	5.09
9.75	9.12	5.36
10.00	9.56	5.62
10.25	10.19	5.99
11.00	12.64	7.44
11.50	16.05	9.44
12.00	16.18	9.52
13.00	21.86	12.86
14.00	25.75	15.15
16.00	40.94	24.08
18.00	55.14	32.44
20.00	72.52	42.66
22.00	99.73	58.66

Trillion

SIZE	C.Z. weight	Diamond weight
3.50	0.28	0.16
3.75	0.32	0.19
4.00	0.39	0.23
4.25	0.46	0.27
4.50	0.53	0.31
4.75	0.63	0.37
5.00	0.72	0.42
5.25	0.83	0.49
5.50	0.93	0.55
5.75	1.08	0.64
6.00	1.19	0.70
6.25	1.28	0.75
6.50	1.55	0.91
6.75	1.66	0.98
7.00	1.87	1.10
7.50	2.06	1.21
8.00	2.97	1.75
8.50	3.00	1.76
9.00	3.99	2.35
10.00	5.30	3.12
11.00	6.22	3.66
12.00	8.33	4.90
13.00	10.91	6.42

Triangle

SIZE	C.Z. weight	Diamond weight
3.00	0.21	0.12
3.50	0.30	0.18
4.00	0.40	0.24
4.25	0.54	0.32
4.50	0.63	0.37
5.00	0.76	0.45
5.25	0.90	0.53
5.50	1.13	0.66
5.75	1.20	0.71
6.00	1.30	0.76
6.25	1.46	0.86
6.50	1.60	0.94
6.75	1.73	1.02
7.00	1.89	1.11
7.25	2.25	1.32
7.50	2.47	1.45
7.75	2.88	1.69
8.00	3.04	1.79
8.25	3.16	1.86
9.00	3.66	2.15
9.25	4.32	2.54
9.50	5.13	3.02
9.75	5.52	3.25
10.00	5.98	3.52
10.25	6.17	3.63
11.00	8.05	4.74
12.00	10.25	6.03
13.00	13.80	8.12
14.00	15.94	9.83
15.00	17.92	10.54
20.00	49.44	29.08
25.00	89.96	52.92

Radiant

SIZE	C.Z. weight	Diamond weight
4.50 x 3.50	0.58	0.34
5 x 3	0.52	0.31
6 x 3	0.70	0.41
6 x 4	1.03	0.60
6.50 x 4.50	1.41	0.83
7 x 5	1.94	1.14
7.5 x 5.5	2.50	1.47
8 x 6	2.96	1.74
8.5 x 6.5	3.80	2.24
9 x 7	4.46	2.62
9.50 x 7.50	5.40	3.18
10 x 8	5.94	3.49
11 x 9	8.58	5.05
12 x 9	10.30	6.06
11.50 x 10	10.97	6.45
12 x 10	11.55	6.79
14 x 10	14.40	8.47
13 x 11	15.86	9.33
13.50 x 11.50	17.32	10.19
14 x 12	20.64	12.14
20 x 10	22.85	13.44
16 x 12	23.08	13.58
18 x 13	33.68	19.81
20 x 15	47.86	28.15
24 x 16	69.60	40.94