Diamond Classics

SKD RING SIZE	Inside Diameter in millimeters	American Size

45.24	14.40	3 1/2
45.5	14.48
45.75	14.56	3 3/4
46	14.64
46.5	14.80	4
47	14.96	4 1/4
47.5	15.10
47.73	15.20	4 1/2
48	15.30
48.5	15.44	4 3/4
49	15.60	5
49.5	15.76	5 1/4
50	15.90
50.24	16.00	5 1/2
50.5	16.10
51	16.23	5 3/4
51.5	16.39	6
52	16.55	6 1/4
52.5	16.70
52.75	16.80	6 1/2
53	16.90
53.5	17.03	6 3/4
54	17.19	7
54.5	17.30
54.64	17.40	7 1/4
55	17.50
55.26	17.60	7 1/2
55.5	17.70
56	17.83	7 3/4
56.5	17.99	8
57	18.10
57.15	18.20	8 1/4
57.5	18.30
57.78	18.40	8 1/2
58	18.50
58.5	18.62	8 3/4
59	18.78	9
59.5	18.90
59.66	19.00	9 1/4
60	19.10
60.29	19.20	9 1/2
60.5	19.30
61	19.42	9 3/4
61.5	19.58	10
62	19.70
62.17	19.80	10 1/4
62.8	20.00	10 1/2
63	20.05
63.43	20.20	10 3/4
64	20.37	11
64.68	20.60	11 1/4
65	20.70
65.3	20.80	11 1/2
66	21.01	11 3/4
66.57	21.20	12
67.2	21.40	12 1/4
67.82	21.60	12 1/2
68.45	21.80	12 3/4
69.1	22.00	13