Size Guide

Ring Size Guide

 

【 How to Measure Your Ring Size 】

You can easily measure it at home.
What you need: A strip of paper or string, a ruler, a pen, and cellophane tape.

■ How to Measure

① Tightly wrap the paper or string around the thickest part of the finger you want to measure.
　(Securing it with cellophane tape will make measuring easier)

② Mark where the ends overlap.

③ Measure the length from mark to mark and compare it with the "Finger Circumference" below.

 

【 Size Chart 】

JP Size	US Size	EU Size	Finger Circumference (Inner Circumference)	Inner Diameter (Diameter)
0	1	40	39.8 mm	12.7 mm
1	1.5	41	40.8 mm	13 mm
2	2	42	41.9 mm	13.4 mm
3	2.5	43	42.9 mm	13.7 mm
4	3	44	44 mm	14 mm
5	3.5	45	45 mm	14.4 mm
6	3.75	46	46.1 mm	14.7 mm
7	4	47	47.1 mm	15 mm
8	4.5	48	48.2 mm	15.4 m
9	5	49	49.2 mm	15.7 mm
10	5.5	50	50.3 mm	16 mm
11	6	51	51.3 mm	16.4 mm
12	6.5	52	52.4 mm	16.7 mm
13	7	53	53.4 mm	17 mm
14	7.5	54	54.5 mm	17.4 mm
15	8	55	55.5 mm	17.7 mm
16	8.25	56	56.5 mm	18 mm
17	8.5	57	57.6 mm	18.4 mm
18	9	58	58.6 mm	18.7 mm
19	9.5	59	59.7 mm	19 mm
20	10	60	60.7 mm	19.4 mm
21	10.5	61	61.8 mm	19.7 mm
22	10.75	62	62.8 mm	20 mm
23	11	63	63.9 mm	20.4 mm
24	11.5	64	64.9 mm	20.7 mm
25	12	65	66 mm	21 mm
26	12.5	66	67 mm	21.4 mm
27	13	67	68 mm	21.7 mm
28	13.5	68	69 mm	22 mm

【 Please Note 】

・Ring sizes vary by product. Please check the sizes listed on each product page.
・Rings with a wider band design may feel tighter even if they are the same size.
※ For wide rings (5mm or more), it is recommended to choose a size 0.5 to 1 size larger than usual for a comfortable fit.
・Finger size changes depending on temperature and time of day. We recommend measuring multiple times.
・This is an approximate guide; for an accurate size, we recommend having your finger measured at a jewelry store.