Follow these steps to find the right size for the ring you want to buy.
1. Measure the inside diameter of a ring that currently fits your finger perfectly.
2.If your measurement is in centimeters (eg 1.65 cm) convert to millimeters (mm) by multiplying by ten (eg 1.65 x 10 = 16.5 mm).
3.Using the following table match the diameter dimension (mm) with the ring number. (In our example 16.5 mm corresponds to number 12).