This is not the diameter of the bracelet but of your arm. Use a string to meassure your wrist. Put it firmly around your wrist, not to loose. Then measure this and compare it to the tabel below.
XS: 15,5 cm
S: 16,5 cm
M: 17,5 cm
L: 18,5 cm
XL: 19,5 cm
This design is meant to fit somewhat tight around your wrist. Don't purchase it too big or else it may pop open while you wear it because of the tension on the bracelet.
