Ring Size GuideJCS standard

Please refer to our Size Guide below to find your perfect fit. Our rings follow the JCS (Japan Custom Size) standard, which is the standard sizing system used in Japan. If your desired ring size is not listed on the ring's product page, please contact us.

For the most accurate measurement, we strongly recommend using a rigid, non-bendable ring sizer. Flexible or adjustable sizing tools (such as paper strips or string) can stretch or compress, leading to inaccurate measurements and poor fit. Professional plastic or metal ring sizers provide precise measurements and are available from most jewelers or online. Please contact us if you need assistance finding one.

Note: Measurements may vary slightly due to individual differences and measurement methods. When in doubt, use the inner circumference (mm) as your guide.