On Falcinelli Italy the ring size refers to the Italian sizes.

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 Finger Circumference (mm)
IT
ISO
US
50.6
10 50 5 ¼
51.2
11 51 5 ¾
52.5
12 52 6
53.1
13 53 6 ½
54.4
14
54 6 ¾
55.0
15 55 7 ¼
56.3
16 56 7 ¾
57.6
17 57 8
58.2
18 58 8 ½
59.5
19 59 8 ¾
60.1
20 60 9 ¼
61.4
21
61
9 ½
62.1
22
62
10