About Ring Size Notation
Ring sizes on each product page are indicated in S, M, L, and Japanese sizes (gou, or number sizes).
If you don't know your size
If you are unsure of your size, the "Ring Sizer" smartphone app is a convenient tool. By placing a ring you own on your smartphone screen, you can easily get an approximate size measurement.
Ring Size Chart
| Ring Size (Japan) |
Inner Diameter (mm) |
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 (Thickness) and Sizing Tips
The fit of a ring can vary depending on its design and width (thickness). Wider rings (chunky designs) have a larger surface area in contact with the finger, so they tend to feel tighter even if they are the same size as a thinner ring. Therefore, when choosing a wider design, we recommend a size approximately 1 number larger than your usual size.
Size Exchange Policy
In the unlikely event that the delivered ring size does not fit, we will accept size exchanges if you contact us within one week of purchase (for domestic shipments). Please shop with confidence.
International Ring Size Conversion Chart
Ring size standards vary by country and region. If you know your overseas size, please refer to the conversion chart below to find your appropriate size.
International Ring Size Conversion Chart
| 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 |
| No. 18 |
8.5 |
18.5 |
| No. 19 |
9 |
19.5 |
| No. 20 |
9.5 |
21 |
| No. 21 |
9.75 |
22 |
| No. 22 |
10 |
23 |
| No. 23 |
10.5 |
24 |
| No. 24 |
11 |
25 |
| No. 25 |
11.5 |
26 |
If you are concerned about choosing a ring size
"I'm worried if it will fit my finger..."
"I want a slightly smaller (or larger) size"
If you have any requests or questions about sizing, please feel free to ask us.
We will do our best to help you find the most beautiful fit for your hand.
If you have any other questions, please feel free to contact us through the following channels:
