Brand chart · Japan
Mikimoto ring size chart
Mikimoto is a Japanese house and quotes the Japanese numeric scale — #1 upward, in whole numbers. The table below places it beside inside diameter in millimetres and the US, UK and EU scales, which is what you need if you are ordering from outside Japan.
The table
Mikimoto sizes in millimetres
Mikimoto quotes the japanese numeric scale. A number from #1 to about #30, written with a hash. Half sizes are rare, so round up when you land between two.
| Mikimoto size | Ø mm | Circ. mm | US / CA | UK / AU | EU / ISO | India |
|---|---|---|---|---|---|---|
| #4 | 14.1 | 44.2 | 3 | F | 44 | 4 |
| #5 | 14.5 | 45.5 | 3½ | G | 45 | 5 |
| #6 | 14.9 | 46.8 | 4 | H | 47 | 7 |
| #8 | 15.3 | 48.0 | 4½ | I | 48 | 8 |
| #9 | 15.7 | 49.3 | 5 | J | 49 | 9 |
| #10 | 16.1 | 50.6 | 5½ | K | 51 | 11 |
| #11 | 16.5 | 51.9 | 6 | L | 52 | 12 |
| #13 | 16.9 | 53.1 | 6½ | M | 53 | 13 |
| #14 | 17.3 | 54.4 | 7 | N | 54 | 14 |
| #15 | 17.7 | 55.7 | 7½ | O | 56 | 15 |
| #16 | 18.1 | 57.0 | 8 | P | 57 | 17 |
| #17 | 18.5 | 58.2 | 8½ | Q | 58 | 18 |
| #18 | 18.9 | 59.5 | 9 | R | 60 | 19 |
| #19 | 19.4 | 60.8 | 9½ | S | 61 | 21 |
| #21 | 19.8 | 62.1 | 10 | T | 62 | 22 |
| #22 | 20.2 | 63.3 | 10½ | U | 63 | 23 |
| #23 | 20.6 | 64.6 | 11 | V | 65 | 25 |
| #24 | 21.0 | 65.9 | 11½ | W | 66 | 26 |
| #25 | 21.4 | 67.2 | 12 | X | 67 | 27 |
Derived from ISO 8653, the standard the whole trade sizes against, and labelled with the scale Mikimoto prints. It is a conversion table, not a copy of the brand's own list — confirm the exact range against the retailer before ordering, since any house can change what it stocks.
The Japanese scale
Japanese sizes are whole numbers, running from #1 to about #27 in the range people actually wear. A Japanese #13 is close to a US 6½, and #21 is close to a US 10. Half sizes are unusual, so a measurement between two numbers rounds up.
Boutiques outside Japan often quote the local scale instead, so the same ring can be a #13 in Tokyo and a 6½ in New York. Both refer to the same 16.9 mm of inside diameter.
Pearl rings in particular
A pearl sits proud of the band and shifts the weight of the ring to the top of the finger, which makes a slightly loose fit rotate. Size a pearl ring snugly rather than generously, while still clearing the knuckle.
Resizing a pearl or stone-set piece is more delicate than resizing a plain band, and heat is a risk to the pearl. Get the size right first. The calibrated ring sizer gives you the inside diameter in millimetres, which is the one number that means the same thing in every catalogue.
Before you order
What moves the size on a Mikimoto ring
- Japanese sizes are whole numbers
- No halves in the standard range. Round up when a measurement lands between two.
- A pearl ring rotates if loose
- Weight above the band turns a slightly large ring on the finger. Size snug, not generous.
- Resizing risks the stone
- Heat used at the join is a hazard to pearls. The first size should be the right one.
Ordering from elsewhere
Your size in the market you are buying from
The japanese numeric scale is read in Japan. Pick where you are ordering from and the switcher gives the local number for the same finger — or the millimetre, where local practice is too mixed to convert into.
Do not know it? Measure a ring on your calibrated screen — it is the only number here that is not a conversion of another number.
Indian numeric
14
A number from 1 to about 30. Indian jewellers frequently print the UK letter beside it, because both are in daily use.
India. Indian jewellers quote a numeric scale of their own, roughly 1 to 30. Tanishq, Malabar Gold, Kalyan and GIVA all use it, and many print the UK letter beside it. Online-first brands often list US sizes as well, so check which scale a listing means before ordering. Full India ring size chart.
United States. The US numeric scale, sold mostly in half sizes. Quarter sizes exist and a jeweller can cut them, but they are rarely stocked. Full USA ring size chart.
United Kingdom. Letters, in half-letter steps. British hallmarked rings are usually stamped with the letter, so an inherited ring often tells you its own size if you look inside the band. Full UK ring size chart.
Europe. France, Germany, the Netherlands and Scandinavia quote the ISO 8653 number, which is the inside circumference in millimetres. Italy, Spain and Switzerland quote the same measurement minus 40, so a 54 becomes a 14. Full Europe ring size chart.
Japan. The Japanese numeric scale runs #1 to about #27 for the sizes people actually order. Mikimoto, Tasaki and 4°C all use it. Japanese sizes are usually whole numbers only. Full Japan ring size chart.
China. Mainland Chinese listings usually give 圈号 — the inside circumference in millimetres, the same number as EU/ISO. Hong Kong uses a separate numbered scale, and marketplace listings mix both with US sizes. Order by inside diameter in millimetres when a listing does not say which scale it means.
Australia. Australia and New Zealand use the UK letter scale unchanged, so a UK N is an Australian N.
Canada. Identical to the United States. A US 7 is a Canadian 7, with no conversion in between.
Singapore. Singapore retail is mixed: international brands quote US numbers, goldsmiths in the Chinese tradition quote Hong Kong numbers, and British-founded chains quote letters. Ask for the inside diameter in millimetres and you sidestep the whole problem.
Malaysia. As in Singapore, US numbers dominate modern retail while traditional goldsmiths use Hong Kong numbers. Confirm the scale, or the diameter, before you order.
United Arab Emirates. Gulf retail quotes US sizes most often. British-founded chains use letters, and the many Indian gold houses in Dubai use the Indian scale, so the same finger can be quoted three ways along one street.
South Africa. South Africa follows the UK letter scale. Online stores that ship from the United States will quote numbers instead.
Brazil. Brazilian sizes are the inside circumference in millimetres minus 40 — the same arithmetic Switzerland uses. A 54 mm circumference is a Brazilian 14.
Mexico. Mexican jewellers use a local numeric scale that is not the US one, and the published conversions for it disagree with each other. We will not print a number we cannot stand behind, so order by inside diameter in millimetres, or ask the retailer for the diameter of the size they are offering. Large chains and online stores generally quote US sizes.
Questions
Mikimoto sizing, answered
What is Japanese ring size 13 in US?
About a US 6½, an inside diameter near 16.9 mm.
How does the Japanese ring size scale work?
It is a numeric scale from #1 upward in whole numbers, with each step a little under half a US size. Sizes are written with a hash, as #13.
What is the average ring size in Japan?
Around #11 to #13 for women and #20 to #22 for men, which is roughly US 6 to 6.5 and US 10 to 11.
Can I convert a Japanese size to a UK letter?
Yes — the table above carries the letter, and the international ring size chart shows all five scales in one row.
Measure once, order in any scale
The sizer calibrates your screen against a bank card first, so the circle you match your ring to is a real millimetre wide.