http://www.titaniumconcepts.com/sizes.htm I copied this chart fromanother site so I can't say how accurate it is, but I've been usingit with no trouble.
Japanese 18 would be U.S. size 9
Try this table:
Japanese ring size 18 is equivalent to US size 9 (18.99 mm insidediameter). Taken from the refernce section of Stuller's FindingsCatalog.
Paul D. ReillyThe Paul Reilly CompanyColorado Springs, Colorado
size 18 in Japan translates to sz 9 USA
M'lou, I'm sorry that I didn't see your original post. The referencechart which I have says: Japanese 18 equals 8 1/4 American.
David BarzilayLord of the Rings607 S Hill St Ste 850Los Angeles, CA 90014-1718213-488-9157
Happened to look in Jeweler's Resource by Bruce Knuth and the UStranslation of a Japanese size 18 is a US size 9.
Patti SowellRio GrandeTechnical Support
Japanese Ring Size 18 is equal to 8 1/2 US Ring Size. Their 19 isequal to our 9. Happen to have a souvenier Ring Sizer from a Fellowtool dealer from Tokyo.
Kenneth Singhkarat46@aol.commanufacturers of Ring Mandrels in USA.