Ring Size Information
Ring sizes on each product page are indicated in S, M, L, and Japanese sizes (gou numbers).
If you don't know your size
If you are unsure of your size, we recommend using the smartphone app "Ring Sizer".
You can easily measure your approximate size by placing an existing ring on your smartphone screen.
| Ring Size (Japan) |
Ring Inner Diameter (mm) |
Inner Circumference / Finger Circumference (mm) |
| 1 |
13 |
40.84 |
| 2 |
13.33 |
41.89 |
| 3 |
13.66 |
42.94 |
| 4 |
14 |
43.98 |
| 5 |
14.33 |
45.03 |
| 6 |
14.66 |
46.08 |
| 7 |
15 |
47.12 |
| 8 |
15.33 |
48.12 |
| 9 |
15.66 |
49.22 |
| 10 |
16 |
50.27 |
| 11 |
16.33 |
51.31 |
| 12 |
16.66 |
52.36 |
| 13 |
17 |
53.41 |
| 14 |
17.33 |
54.45 |
| 15 |
17.66 |
55.5 |
| 16 |
18 |
56.55 |
| 17 |
18.33 |
57.6 |
| 18 |
18.66 |
58.64 |
| 19 |
19 |
59.69 |
| 20 |
19.33 |
60.74 |
| 21 |
19.66 |
61.78 |
| 22 |
20 |
62.83 |
| 23 |
20.33 |
63.88 |
| 24 |
20.66 |
64.93 |
| 25 |
21 |
65.97 |
Ring Width and Size Selection Tips
The feel of a ring's size can vary depending on the design and "width" (thickness).
Wider rings (designs with more volume) tend to feel tighter even with the same size as thinner rings, because they have a larger surface area touching the finger. Therefore, when choosing a wide design, we recommend a size about 1 size larger than your usual size.
Size Exchange
If the ring you received does not fit, we will accept a size exchange if you contact us within one week of purchase.
Please shop with peace of mind.
International Ring Size Conversion Chart
Ring size standards vary by country and region.
If you know your international size, please refer to the conversion chart below to find your suitable size.
| Japan |
US |
Italy |
| 1 |
1 |
1 |
| 2 |
2 |
2 |
| 3 |
2.5 |
3 |
| 4 |
3 |
4 |
| 5 |
3.5 |
5 |
| 6 |
3.75 |
6 |
| 7 |
4 |
7 |
| 8 |
4.5 |
8 |
| 9 |
5 |
9 |
| 10 |
5.25 |
10 |
| 11 |
5.75 |
11 |
| 12 |
6 |
12 |
| 13 |
6.5 |
13 |
| 14 |
7 |
14.5 |
| 15 |
7.5 |
15.5 |
| 16 |
7.75 |
16.5 |
| 17 |
8 |
17.5 |
| 18 |
8.5 |
18.5 |
| Size 19 |
9 |
19.5 |
| Size 20 |
9.5 |
21 |
| Size 21 |
9.75 |
22 |
| Size 22 |
10 |
23 |
| Size 23 |
10.5 |
24 |
| Size 24 |
11 |
25 |
| Size 25 |
11.5 |
26 |
Consultation for non-standard sizes (Custom-made)
Even if you cannot find a size that fits you among the available sizes shown on the product page, we may be able to custom-make it for you depending on the design.
If you cannot find your desired size or have any other questions, please feel free to contact us using the following channels:
