Jewellery size guide - unconventional

Size (mm)	Diameter (mm)	Australian Size	British Size	French Size	German Size	Italian Size	Asia Size	Swiss Size	USA/CAN Size
48	15.27	I 1/2	I 1/2		15.25	8	8		4 1/2
49	15.7	J 1/2	J 1/2		15.75	9.5	9		5
51	16.1	L	L	51 3/4	16	10.5	11	11.75	5 1/2
52	16.51	M	M	52 3/4	16.5	11.5	12	12.75	6
53	16.92	N	N	54	17	13	13	14	6 1/2
55	17.35	O	O	55 1/4	17.25	14.5	14	15.25	7
56	17.75	P	P	56 1/2	17.75	16	15	16.5	7 1/2
57	18.9	Q	Q	57 3/4	18	17	16	17.75	8
58	18.53	Q 1/2	Q 1/2	58	18.5	18.5	17		8 1/2
59	18.89	R 1/2	R 1/2	59 1/4	19	19.5	18		9
61	19.41	S 1/2	S 1/2	60 1/2	19.5	21	19		9 1/2
62	19.84	T 1/2	T 1/2	61 3/4	20	22	20		10
63	20.20	U 1/2	U 1/2	62 3/4	20.25	23.5	22		10 1/2
65	20.68	V 1/2	V 1/2	64 1/4	20.75	25	23		11
66	21.08	W 1/2	W 1/2	66	21	26.5	24		11 1/2
68	21.49	Y	Y	67 1/2	21.25	27.5	25	27.5	12
69	21.89	Z	Z	68 3/4	21.75	28.5	26	28.75	12 1/2
70	22.33				22	30	27		13