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We advise that you measure the size of your finger rather than the size of your ring.

Wrap a length of string or ribbon around the base of your finger. To ensure the ring fits comfortably, we suggest measuring your knuckle as well. Select a size that will slide on and off your finger easily.
With a pen, mark the point on the string where the ends meet.
Measure the string in millimetres with a ruler.
Choose the closest measurement to the chart below to identify your ring size.

Size data
France	UK	Italy	US
46	H 1/2	8	4
47	I	8/9	4 1/4
48	I 1/2	9	4 1/2
49	J	10	4 3/4
49.5	J 1/2	10/11	5
50	K	11	5 1/4
50.5	K 1/2	12	5 1/2
51	L	12/13	5 3/4
52	L 1/2	13	6
53	M	14	6 1/4
53.5	M 1/2	14/15	6 1/2
54	N	15	6 3/4
54.5	N1/2	15/16	7
55	O	16	7 1/4
55.5	O1/2	17	7 1/2
56	P	17/18	7 3/4
57	P 1/2	18	8
58	Q	18/19	8 1/4
58.5	Q 1/2	19	8 1/2
59	R	19/20	8 3/4
60	R 1/2	20	9