Size Guide

All rings are labeled in standard JP sizes known as JCS (Japan Custom Size). Please measure the length around your finger with your measuring tape and select one with a little room in the inner circumference size.

JP US Inner Circumference Diameter
(mm) (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