WHi uses international girth measurements, and ±0.5mm is the normal range.

The ring circumference can be measured according to the following methods:

1. Use a non-elastic ruler, cotton thread or thin strip of paper to wrap around the base of the finger you want to wear.
2. Flatten it out and measure the length.
3. Compare the obtained circumference with the table below and find the closest value which is your ring number.