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Conversion Table

Buying Amber rings and need help to Convert US Size to European size? Below is a conversion table :

Diameter (mm)Circumference (mm)USA / CanadaUK / AustraliaAsiaSwitzerland
Europe / ISO
14.144.23F44
14.344.8F-1/255 1/2
14.545.53 1/2G
14.746.1G-1/266 1/2
14.946.84H7
15.147.4H-1/27 3/4
15.3484 1/2I8
15.548.7J9
15.749.35J-1/29
15.950K10
16.150.65 1/2K-1/210
16.351.2L11 3/4
16.551.96L-1/21112 3/4
16.752.5M12
16.953.16 1/2M-1/21314
17.153.8N
17.354.47N-1/21415-1/4
17.555.1O
17.755.77 1/2O-1/21516-1/2
17.956.3P
18.1578P-1/21617-3/4
18.357.6Q
18.558.38 1/2Q-1/217
18.858.9R19
1959.59R-1/218
19.260.2S20-1/4
19.460.89 1/2S-1/219
19.661.4T21-1/2
19.862.110T-1/220
2062.7U21
20.263.410 1/2U-1/22222-3/4
20.464V
20.664.611V-1/223
20.865.3W25
2165.911 1/2W-1/224
21.266.6X
21.467.212X-1/22527-1/2
21.667.8Y
21.868.512 1/2Z2628-3/4
2269.1Z-1/2
22.269.71327
22.470.4Z + 1
22.67113-1/2

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