57mm refers to a ring with a circumference of 57mm. Currently, there are four mainstream ring size standards in the market: Hong Kong version ring size, mainland version ring size, American version ring size, and European version ring size. They all have rings with a circumference of 57mm, and the specific selection needs to be based on the comparison table used by the store.
Mainland version ring size comparison chart
According to the table below, the ring with a circumference of 57mm corresponds to the mainland version size 17 and a diameter of 18.2mm.
Hong Kong Ring Size Comparison Table
According to the table below, the ring with a circumference of 57mm corresponds to the Hong Kong version number 15 and a diameter of 17.3mm.
US Ring Size Comparison Table
According to the table below, the ring with a circumference of 57mm corresponds to a US size of around 8 and a diameter of 18.1mm.
European Ring Size Comparison Table
According to the table below, the ring with a circumference of 57mm corresponds to the European size 57 and a diameter of 18.14mm.
