6.6cm refers to a ring with a circumference of 66mm. 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 66mm, 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 66mm corresponds to the mainland version size 26 and a diameter of 20.7mm.
Hong Kong Ring Size Comparison Table
As shown in the table below,
Perimeter 66mm
US Ring Size Comparison Table
As shown in the table below,
Perimeter 66mm
European Ring Size Comparison Table
As shown in the table below,
Perimeter 66mm
