About Ring Size Indications
Ring sizes on each product page are indicated in S, M, L, and Japanese sizes (gou numbers).
If you don't know how to measure your size
If you are unsure of your size, we recommend using the smartphone app "Ring Sizer".
By placing your current ring on the smartphone screen, you can easily measure an approximate size.
Ring Size Chart
| Ring Size (Gou) |
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 (Thickness) and Sizing Tips
The feel of a ring size can vary depending on its design and width (thickness).
Wider rings (voluminous designs) tend to feel tighter even at the same size as thinner rings, due to the increased contact area with the finger. Therefore, when choosing a wide design, we recommend going up one size from your usual size.
About Size Exchange
In the unlikely event that the ring size delivered does not fit, we will accept a size exchange if you contact us within one week of purchase.
Please enjoy your shopping 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 correct size.
International Ring Size Conversion Chart
| Japan |
USA |
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 |
Trouble choosing a ring size?
"I'm worried if it will fit my finger..."
"I want a slightly smaller (or larger) size."
Please feel free to contact us with any requests or questions regarding sizing.
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:
