VERA uses the US ring sizing system as reference for measurements.
Not sure about your ring size? Here are a few tips:
Use an existing ring and take its inner diameter (in mm) by measuring across the ring with a ruler.
Or, comfortably wrap a piece of string around your finger. Mark the spot where the string meets. With a ruler, measure the length of string to get your finger's inner circumference (in mm).
Consult the table above for your US ring size.
The ring you want may be bigger or smaller than your measurement, but bear in mind that you can always wear the ring on another finger.
Take your measurement several times to get an accurate reading. It's best to do this at the end of the day, with warm hands.
A good, comfortable fit is snug enough that the ring won't fall off, but loose enough to slide easily over your knuckle. Chunkier rings are better worn loose than tight. When in doubt, take the larger size.