If you do not know your ring size, we highly recommend having your finger sized by a local jeweler and asking for your US ring size.
You can also try this website or our ring sizing guide to get an idea.
(If you are looking for a wooden ring, we recommend him highly)
We are responsible for sending you the ring size you ordered. However we cannot be responsible for determining your ring size. (Some people wear their rings loose, some tight. The size is your responsibility.) If you still aren't sure, contact us and we will do our best to help you!