Contenti Ring Blank Sizing Chart
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1Ring Blank Sizing Chart
To determine your ring blank length, find the desired ring size in the far left column, then read across to the appropriate material thickness.
* Add 0.5 mm to the length of the blank if the width of your material is greater than 4 mm.
Material Thickness
US
Metric
Diameter
Circum.
10 ga.
12 ga.
14 ga.
16 ga.
18 ga.
20 ga.
Ring Size
Ring Size
(mm)
(mm)
2.6 mm
2.4 mm
2.2 mm
2.1 mm
2.0 mm
1.8 mm
1.6 mm
1.4 mm
1.3 mm
1.2 mm
1.0 mm
0.8 mm
41.5
1
39.0
12.4
39.0
47.1
46.5
45.9
45.6
45.2
44.6
44.0
43.4
43.0
42.7
42.1
42.7
1
/
1
40.2
12.8
40.2
48.4
47.8
47.1
46.8
46.5
45.9
45.2
44.6
44.3
44.0
43.4
2
44.0
2
41.5
13.2
41.5
49.6
49.0
48.4
48.1
47.8
47.1
46.5
45.9
45.6
45.2
44.6
45.2
2
/
1
42.7
13.6
42.7
50.9
50.3
49.6
49.3
49.0
48.4
47.8
47.1
46.8
46.5
45.9
2
46.5
3
44.0
14.0
44.0
52.2
51.5
50.9
50.6
50.3
49.6
49.0
48.4
48.1
47.8
47.1
47.8
3
/
1
45.2
14.4
45.2
53.4
52.8
52.2
51.8
51.5
50.9
50.3
49.6
49.3
49.0
48.4
2
49.0
4
46.5
14.8
46.5
54.7
54.0
53.4
53.1
52.8
52.2
51.5
50.9
50.6
50.3
49.6
50.3
4
/
1
47.8
15.2
47.8
55.9
55.3
54.7
54.3
54.0
53.4
52.8
52.2
51.8
51.5
50.9
2
51.5
5
49.0
15.6
49.0
57.2
56.5
55.9
55.6
55.3
54.7
54.0
53.4
53.1
52.8
52.2
52.8
5
/
1
50.3
16.0
50.3
58.4
57.8
57.2
56.9
56.5
55.9
55.3
54.7
54.3
54.0
53.4
2
54.0
6
51.5
16.4
51.5
59.7
59.1
58.4
58.1
57.8
57.2
56.5
55.9
55.6
55.3
54.7
55.3
6
/
1
52.8
16.8
52.8
60.9
60.3
59.7
59.4
59.1
58.4
57.8
57.2
56.9
56.5
55.9
2
56.5
7
54.0
17.2
54.0
62.2
61.6
60.9
60.6
60.3
59.7
59.1
58.4
58.1
57.8
57.2
57.8
7
/
1
55.3
17.6
55.3
63.5
62.8
62.2
61.9
61.6
60.9
60.3
59.7
59.4
59.1
58.4
2
59.1
8
56.6
18.0
56.5
64.7
64.1
63.5
63.1
62.8
62.2
61.6
60.9
60.6
60.3
59.7
60.3
8
/
1
57.8
18.4
57.8
66.0
65.3
64.7
64.4
64.1
63.5
62.8
62.2
61.9
61.6
60.9
2
61.6
9
59.1
18.8
59.1
67.2
66.6
66.0
65.7
65.3
64.7
64.1
63.5
63.1
62.8
62.2
62.8
9
/
1
60.3
19.2
60.3
68.5
67.9
67.2
66.9
66.6
66.0
65.3
64.7
64.4
64.1
63.5
2
64.1
10
61.6
19.6
61.6
69.7
69.1
68.5
68.2
67.9
67.2
66.6
66.0
65.7
65.3
64.7
65.3
10
/
1
62.8
20.0
62.8
71.0
70.4
69.7
69.4
69.1
68.5
67.9
67.2
66.9
66.6
66.0
2
66.6
11
64.1
20.4
64.1
72.3
71.6
71.0
70.7
70.4
69.7
69.1
68.5
68.2
67.9
67.2
67.9
11
/
1
65.3
20.8
65.3
73.5
72.9
72.3
71.9
71.6
71.0
70.4
69.7
69.4
69.1
68.5
2
69.1
12
66.6
21.2
66.6
74.8
74.1
73.5
73.2
72.9
72.3
71.6
71.0
70.7
70.4
69.7
70.4
12
/
1
67.9
21.6
67.9
76.0
75.4
74.8
74.5
74.1
73.5
72.9
72.3
71.9
71.6
71.0
2
71.6
13
69.1
22.0
69.1
77.3
76.7
76.0
75.7
75.4
74.8
74.1
73.5
73.2
72.9
72.3
73.8
13
/
1
71.3
22.7
71.3
79.5
78.9
78.2
77.9
77.6
77.0
76.3
75.7
75.4
75.1
74.5
2
75.1
14
72.6
23.1
72.6
80.7
80.1
79.5
79.2
78.9
78.2
77.6
77.0
76.7
76.3
75.7
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