Ring Sizing Guide

Internal Diameter (mm) US UK Europe 
15 4 H - I 47
15.75 5 J - K 50
16.5 6 L - M 52
17.5 7 N - O 55
18 8 P - Q 57
19 9 R - S 60
20 10 T - U 62
21 11 V - W 64
21.5 12 Y - Z 67.5