Ring Size Guide

Please refer to our Size Guide below to find your perfect fit. Our rings follow the JCS (Japan Circle 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.
US Size Japan Size Inner Diameter Inner Circumference
3 3/8 5 14.4 mm 45.1 mm
3 5/8 6 14.6 mm 45.7 mm
4 7 14.9 mm 46.7 mm
4 1/2 8 15.3 mm 48.0 mm
5 9 15.7 mm 49.3 mm
5 3/8 10 16.0 mm 50.3 mm
5 3/4 11 16.3 mm 51.2 mm
6 12 16.5 mm 51.9 mm
6 1/2 13 16.9 mm 53.2 mm
7 14 17.4 mm 54.5 mm
7 1/2 15 17.8 mm 55.8 mm
8 16 18.2 mm 57.2 mm
8 1/2 17 18.5 mm 58.2 mm
9 18 18.9 mm 59.3 mm

How to find your ring size

For the most accurate fit, we recommend using a physical ring sizer rather than measuring with paper or string.

A reusable plastic ring sizer is inexpensive, easy to use, and gives a much better sense of how a ring will actually fit over your knuckle. For the best approximation, use a ring-sizing gauge set with individual rings, since it more closely replicates the feel of wearing an actual ring.

No ring sizer available?

You can measure a ring you already own or measure your finger using the chart above, but we recommend using those methods only as a secondary reference.

Eternity ring sizing

Full eternity rings require a more precise fit because the stones continue around the entire band and resizing options are limited.

For this reason, we strongly recommend confirming your size with a physical ring sizer before placing your order.

If you are between sizes or unsure which size to choose, contact us before ordering and we’ll be happy to help.