In the following table, you can find the information on rings sizes referring to the standard national system.
One of the fastest ways to choose your ring size without mistake is to calculate the circumference of a ring you already have. Compare the obtained result with the table data and you will be able to choose the right size for you. Every model is in fact available in different sizes and it is important to choose the one of the finger you will put your ring on.
If you do not have a Pianegonda’s ring to measure, you can measure your finger’s circumference by using a tailor meter. Put it around your finger, compare the circumference with the table sizes, calculate the diameter and then compare it with the diameter of the ring you will wear: the two measures have to be the same.