Different versions of the size 15 ring are different in size. There are two sizes of Hong Kong ring size and mainland ring size in China.
Diameter 17.5mm, that is 1.75 cm.
Second, the choice of ring size advice
3, If you want to get a more exact size, you can measure at the end of the dinner on this day, because this time the finger size is the largest.
4, the general ring is worn on the index finger, middle finger or ring finger, most girls wear the ring number of 10-15, of which 12, 13 more; Most boys wear ring numbers 17-22, of which 18-20 more.