How do you figure out what ring size you are in a reliable way? This has been something that had come up often as a jeweller, helping my clients find the right size for custom and online jewellery. The most accurate method is for me to send you a complimentary plastic ring sizer in the mail.
1) Best ring-size method: Visit My studio
...Or visit a professional jeweller in your area
2) Next best method: Free Ring Sizer
3) Other method
I am not a huge fan of this, but for simpler ring projects and quicker sizing, you can try this printable guide (with all printing for the purpose of sizing, make sure you have your print settings at 100%, and test against a ruler before proceeding – this is very important!). You can also follow these instructions: