Our ring sizes follow the Spanish standard. To help you find your size, we recommend either using a ring that is already available, or using a piece of string as a ring. Once you have it, put it on top of a measuring tape. Measure the diameter or if you prefer, measure the circumference of the finger in mm. Then look at these tables where you can see the equivalences of mm to ring sizes.
Equivalence table in mm
International Ring Chart
Remember that the size of your fingers and hands are different so measure the finger where you want the ring, then put it on and make sure it slides easily. If you want it to fit more fingers, choose one size up. If you have doubts between two sizes, choose the larger size. Keep in mind that your ring size changes through the seasons as well.