1. Choose a ring that fits perfectly on your finger, as this will be the basis for you to take the most accurate measurement possible.
2. Take a ruler and measure the inside of the accessory, getting the middle of the ring exactly - but don't count the edges, otherwise the result may be wrong.
3. Check the result and compare it with the corresponding size in the table below. If your ring is in between one ring and another, choose the larger size.

See the following example:

Now it's your turn, measure the internal diameter in centimeters of your ring, compare it with the table and find your ARO .