Diamonds Knowledge

Estimated Diamonds Weight

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Estimated Weight Of Round Brilliant Cut Diamonds

Round brilliant cuts : Carats = Diameter² x Depth x 0.00609664

Gridle Thin -2% Thick +3% Very Thick +5% Extremely Thick +8%

Bulge Visible +2% Obvious +4% Extreme +6%

Outline Fat +2% Very Fat +4%

Estimated Weight Of "Well-Made" Melee

Diameter, mm	Carat	Diameter, mm	Carat
1.5	0.01	3.0	0.10
1.7	0.02	3.1	0.11
2.0	0.03	3.2	0.12
2.2	0.04	3.3	0.13
2.4	0.05	3.4	0.14
2.5	0.06	3.5	0.16
2.7	0.07	3.6	0.17
2.8	0.08	3.7	0.18
2.9	0.09	3.8	0.20
		3.9	0.22

Estimated Weight Of Round Brilliant Cut Diamonds (diameter 4.0-5.0 mm)

Diameter	4.0			4.2			4.4			4.6			4.8			5.0
Girdle	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK
Depth
1.8	0.17	0.18	0.18
2.0	0.19	0.20	0.20	0.21	0.22	0.22	0.23	0.24	0.24
2.2	0.21	0.21	0.22	0.23	0.24	0.24	0.25	0.26	0.27	0.28	0.28	0.29	0.30	0.31	0.32
2.4	0.23	0.23	0.24	0.25	0.26	0.27	0.28	0.28	0.29	0.30	0.31	0.32	0.33	0.34	0.35	0.36	0.37	0.38
2.6	0.25	0.25	0.26	0.27	0.28	0.29	0.30	0.31	0.32	0.33	0.34	0.35	0.36	0.37	0.38	0.39	0.40	0.41
2.8	0.27	0.27	0.28	0.30	0.30	0.31	0.32	0.33	0.34	0.35	0.36	0.37	0.39	0.39	0.41	0.42	0.43	0.44
3.0	0.29	0.29	0.30	0.32	0.32	0.33	0.35	0.35	0.36	0.38	0.39	0.40	0.41	0.42	0.43	0.45	0.46	0.47
3.2				0.34	0.34	0.35	0.37	0.38	0.39	0.40	0.41	0.43	0.44	0.45	0.46	0.48	0.49	0.50
3.4										0.43	0.44	0.45	0.47	0.48	0.49	0.51	0.52	0.53
3.6																0.54	0.55	0.57
	Carats

Estimated Weight Of Round Brilliant Cut Diamonds (diameter 5.2-6.2 mm)

Diameter	5.2			5.4			5.6			5.8			6.0			6.2
Girdle	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK
Depth
2.6	0.42	0.43	0.44	0.45	0.46	0.48
2.8	0.45	0.46	0.48	0.49	0.50	0.51	0.52	0.54	0.55	0.56	0.57	0.59
3.0	0.48	0.49	0.51	0.52	0.53	0.55	0.56	0.57	0.59	0.60	0.62	0.63	0.65	0.66	0.68	0.69	0.70	0.72
3.2	0.52	0.53	0.54	0.56	0.57	0.59	0.60	0.61	0.63	0.64	0.66	0.68	0.69	0.70	0.72	0.73	0.75	0.77
3.4	0.55	0.56	0.58	0.59	0.60	0.62	0.64	0.65	0.67	0.68	0.70	0.72	0.73	0.75	0.77	0.78	0.80	0.82
3.6	0.58	0.59	0.61	0.63	0.64	0.66	0.67	0.69	0.71	0.72	0.74	0.76	0.77	0.79	0.81	0.83	0.84	0.87
3.8	0.61	0.63	0.65	0.66	0.68	0.70	0.71	0.73	0.75	0.76	0.78	0.80	0.82	0.83	0.86	0.87	0.89	0.92
4.0							0.75	0.76	0.79	0.80	0.82	0.84	0.86	0.88	0.90	0.92	0.94	0.97
4.2													0.90	0.92	0.95	0.96	0.98	1.01
	Carats

Estimated Weight Of Round Brilliant Cut Diamonds (diameter 6.4-7.4 mm)

Diameter	6.4			6.6			6.8			7.0			7.2			7.4
Girdle	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK
Depth
3.2	0.78	0.80	0.82
3.4	0.83	0.85	0.87	0.88	0.90	0.93	0.94	0.96	0.99
3.6	0.88	0.90	0.93	0.94	0.96	0.98	0.99	1.01	1.05	1.05	1.08	1.11	1.12	1.14	1.17
3.8	0.93	0.95	0.98	0.99	1.01	1.04	1.05	1.07	1.10	1.11	1.14	1.17	1.18	1.20	1.24	1.24	1.27	1.31
4.0	0.98	1.00	1.03	1.04	1.06	1.09	1.11	1.13	1.16	1.17	1.19	1.23	1.24	1.26	1.30	1.31	1.34	1.38
4.2	1.03	1.05	1.08	1.09	1.12	1.15	1.16	1.18	1.22	1.23	1.25	1.29	1.30	1.33	1.37	1.37	1.40	1.44
4.4	1.08	1.10	1.13	1.15	1.17	1.20	1.22	1.24	1.28	1.29	1.31	1.35	1.36	1.39	1.43	1.44	1.47	1.51
4.6				1.20	1.22	1.26	1.27	1.30	1.34	1.35	1.37	1.42	1.42	1.45	1.50	1.51	1.54	1.58
4.8										1.41	1.43	1.48	1.49	1.52	1.56	1.57	1.60	1.65
5.0																1.64	1.67	1.72
	Carats

Estimated Weight Of Round Brilliant Cut Diamonds (diameter 7.6-8.6 mm)

Diameter	7.6			7.8			8.0			8.2			8.4			8.6
Girdle	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK
Depth
4.0	1.38	1.41	1.45	1.45	1.48	1.53
4.2	1.45	1.48	1.52	1.53	1.56	1.60	1.61	1.64	1.69	1.69	1.72	1.77
4.4	1.52	1.55	1.60	1.60	1.63	1.68	1.68	1.72	1.77	1.77	1.80	1.86	1.85	1.89	1.95
4.6	1.59	1.62	1.67	1.67	1.71	1.76	1.76	1.79	1.85	1.85	1.89	1.94	1.94	1.98	2.04	2.03	2.07	2.14
4.8	1.66	1.69	1.74	1.74	1.78	1.83	1.84	1.87	1.93	1.93	1.97	2.03	2.02	2.06	2.13	2.12	2.16	2.23
5.0	1.73	1.76	1.81	1.82	1.85	1.91	1.91	1.95	2.01	2.01	2.05	2.11	2.11	2.15	2.22	2.21	2.25	2.32
5.2	1.79	1.83	1.89	1.89	1.93	1.99	1.99	2.03	2.09	2.09	2.13	2.20	2.19	2.24	2.30	2.30	2.34	2.42
5.4							2.06	2.11	2.17	2.17	2.21	2.28	2.28	2.32	2.39	2.39	2.43	2.51
5.6													2.36	2.41	2.48	2.47	2.53	2.60
5.8																2.56	2.62	2.69
	Carats

Estimated Weight Of Round Brilliant Cut Diamonds (diameter 8.8-9.8 mm)

Diameter	8.8			9.0			9.2			9.4			9.6			9.8
Girdle	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK
Depth
4.6	2.13	2.17	2.24
4.8	2.22	2.27	2.33	2.32	2.37	2.44	2.43	2.48	2.55
5.0	2.31	2.36	2.43	2.42	2.47	2.54	2.43	2.58	2.66	2.64	2.69	2.77	2.75	2.81	2.89
5.2	2.41	2.46	2.53	2.52	2.57	2.64	2.63	2.68	2.76	2.75	2.80	2.89	2.86	2.92	3.01	2.98	3.04	3.14
5.4	2.50	2.55	2.63	2.61	2.67	2.75	2.73	2.79	2.87	2.85	2.91	3.00	2.97	3.03	3.13	3.10	3.16	3.26
5.6	2.59	2.64	2.72	2.71	2.77	2.85	2.83	2.89	2.98	2.96	3.02	3.11	3.08	3.15	3.24	3.21	3.28	3.38
5.8	2.68	2.74	2.82	2.81	2.86	2.95	2.93	2.99	3.08	3.06	3.12	3.22	3.19	3.26	3.36	3.33	3.40	3.50
6.0				2.90	2.96	3.05	3.03	3.10	3.19	3.17	3.23	3.33	3.30	3.37	3.47	3.44	3.51	3.62
6.2										3.27	3.34	3.44	3.41	3.48	3.59	3.56	3.63	3.74
6.4																3.67	3.75	3.86
	Carats

Estimated Weight Of Round Brilliant Cut Diamonds (diameter 10.0-11.0 mm)

Diameter	10.0			10.2			10.4			10.6			10.8			11.0
Girdle	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK	TN	MD	TK
Depth
5.4	3.23	3.29	3.39	3.36	3.43	3.53
5.6	3.35	3.41	3.52	3.48	3.55	3.66	3.62	3.69	3.80	3.76	3.84	3.95
5.8	3.47	3.54	3.64	3.61	3.68	3.79	3.75	3.82	3.94	3.89	3.97	4.09	4.04	4.12	4.25
6.0	3.58	3.66	3.77	3.73	3.81	3.92	3.88	3.96	4.08	4.03	4.11	4.23	4.18	4.27	4.39	4.34	4.43	4.56
6.2	3.70	3.78	3.89	3.85	3.93	4.05	4.01	4.09	4.21	4.16	4.25	4.37	4.32	4.41	4.54	4.48	4.57	4.71
6.4	3.82	3.90	4.02	3.98	4.06	4.18	4.14	4.22	4.35	4.30	4.38	4.52	4.46	4.55	4.69	4.63	4.72	4.86
6.6	3.94	4.02	4.14	4.10	4.90	4.31	4.27	4.35	4.48	4.43	4.52	4.66	4.60	4.69	4.83	4.77	4.87	5.01
6.8							4.39	4.48	4.62	4.56	4.66	4.80	4.74	4.84	4.98	4.92	5.02	5.17
7.0													4.88	4.98	5.13	5.06	5.16	5.32
7.2																5.21	5.31	5.47
	Carats