Ring Size

I. After selected your own design of ring, it is important to know the ring size which fits your finger. In the following, we provide one of the methods and tools to measure your ring size.

Measurement steps:

  • Prepare the current ring which fits your finger.
  • Print the circle table below in the exact size.
  • Place your ring over the circle table until you find the one that is matched with the inside edge of the ring, also you may measure the ring diameter to have an accurate result. (i.e. measure of inside diameter of ring)

Ring size measurement chart (in Hong Kong size)

Convert table of ring size

There is several different ring size systems used worldwide. However, DiamondC.com is using the Hong Kong measurement system to define the size of ring. Thus, in the following we provide a table convert different ring size into Hong Kong size.

Ring Size Chart

Inter- Diameter
(mm)
Hong Kong
Size
American
Size
United Kingdom
Size
Japan
Size
Switzerland
Size
14.1 6 3 F 4 4
14.3 7 3.25 F 1/2 5 5.25
14.7 8 3.75 G 6 6.5
14.9 9 4 H 7 7
15.3 10 4.5 I 8 8.5
15.7 11 5 J 1/2 9 9.5
16.1 12 5.5 K 1/2 10 10.5
16.5 13 6 L 1/2 11 12.75
16.7 14 6.25 M 12 13.5
17.1 15 6.75 N 13.5 14.5
17.3 16 7 N 1/2 14 15.25
17.7 17 7.5 O 1/2 15 16.5
18.2 18 8 P 1/2 16.25 18.25
18.5 19 8.5 Q 1/2 17 18.75
18.8 20 9.75 R 17.5 19
19.1 21 9.25 S 18 20
19.4 22 9.5 S 1/2 19 20.75
19.8 23 10 T 1/2 20 21.75
20.2 24 10.5 U 1/2 22 22.75
20.6 25 11 V 1/2 23 24.75
21.0 26 11.5 W 1/2 24 26.25
21.2 27 12 X 24.5 26.75
21.6 28 12.25 Y 25.5 28
22.0 29 12.5 Z 1/2 26.5 29