Size Guide

All rings are made in standard Japanese sizes (JCS). Please refer to the chart below for international size conversions.

Your first ring resizing after purchase is free of charge.

JP US Inner Circumference (mm) Diameter (mm)
1 39.1 12.45
1.5 40.38 12.85
1 40.84 13
2 41.65 13.26
2 41.89 13.33
2.5 42.93 13.67
3 42.94 13.67
4 43.98 14
3 44.21 14.07
5 45.03 14.33
3.5 45.48 14.48
6 46.08 14.67
4 46.76 14.88
7 47.12 15
4.5 48.04 15.29
8 48.17 15.33
9 49.22 15.67
5 49.31 15.7
10 50.27 16
5.5 50.59 16.1
11 51.31 16.33
6 51.87 16.51
12 52.36 16.67
6.5 53.14 16.92
13 53.41 17
7 54.42 17.32
14 54.45 17.33
15 55.5 17.67
7.5 55.7 17.73
16 56.55 18
8 56.97 18.14
17 57.6 18.33
8.5 58.25 18.54
18 58.64 18.67
9 59.53 18.95
19 59.69 19
20 60.74 19.33
9.5 60.8 19.35
21 61.78 19.67