Chao & Eero’s ring size refers to the inner diameter of the ring in millimeters.

Different countries have different systems of numbers or letters to define the general standard of measuring the ring. You can use these charts to convert your ring size to ours. If you don’t know your ring size, the most reliable way to take the correct measurement is to visit your local jewelry store.

Please feel free to contact us if you have any further questions. We are here to help.