How to measure your ring's size?

http://www.boutiquedeanillos.com/how-to-know-your-rings-size-como-saber-vuestra-medida-de-anillo/

Como medir vuestro anillo?

This chart will help you determine the ring size you will require. Use a tape measure, piece of string or piece of string around your finger, where you will be wearing the ring. Mark the string or paper where it overlaps to form a full circle. Then take the marked string or paper and measure it so you can compare it with the below chart. If it is a wide band, you might wish to add one size to accommodate for the extra width.