Ring sizing can be tricky! For those based in Australia, I will happily send a complimentary ring sizer in the post. Please contact me to arrange this. 

Size	Dimensions (mm) inside diameter
H	14.65
I	15.04
J	15.40
K	15.80
L	16.10
M	16.51
N	16.92
O	17.35
P	17.75
Q	18.19
R	18.61
S	19.10
T	19.51
U	20.02
V	20.32
W	20.76
X	21.18