Size Guide

To determine the size of your ring, please see below chart. 
The first column indicate our sizing, in US sizes. The second column in the chart shows the equivalent in Japanese/South American/Turkish sizes. The third and fourth columns indicate the millimetric measurements for each size.  
In order to correctly choose your ring size, you can use a ring that you own and find the corresponding diameter on the ring (indicated in the fourth column). 
In case of hesitation between two sizes, we advise you to choose the larger size, or visit a jeweler for assistance in measuring your ring size. You can always contact us at info@atelierorman.com.

US sizes Japanese/Turkish/ South American sizes Ring circumference Ring diameter
4 7 46.68 mm 14.86 mm
4.5 8 47.97 mm 15.27 mm
5 9
49.32 mm
15.70 mm 
5.5 -
50.58 mm
16.10 mm
6 12
51.87 mm
16.51 mm
6.5 13
53.16 mm
16.92 mm
7 14
54.51 mm
17.35 mm
7.5 15
55.76 mm
17.75 mm
8 16
57.15 mm
18.19 mm
8.5 17 58.21 mm 18.53 mm
9 18 59.34 mm 18.89 mm
9.5 19 60.98 mm 19.41 mm
10 20 62.33 mm 19.84 mm 
Source: http://www.ringsizes.co/