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|Inside Diameter MM||Inside Diameter Inches||USA Canada Mexico Ring Size||UK Ireland Australia New Zealand South Africa Ring Size||Germany France Ring Size||Spain Italy Ring Size||Japan China India South America Ring Size|
Global Ring Sizing Systems
There are several systems for indicating a rings size used around the world:
In the United States, Canada and Mexico, for indicating a rings size uses a numerical measure, for whole and half rings sizes. An increase of a full ring size is an increase of 0.032 inch (0.8128 mm) in diameter, or roughly 1/10 inch in inside circumference.
In United Kingdom, Australia, New Zealand, South Africa and Ireland, the ring sizes are specified using an alphabetical letters, for full and half ring sizes
In Japan, India, South America and China, ring sizes are specified using a numerical measure, that only has whole size rings, and does not have direct correlation with diameter or circumference.
In Italy, Spain, Netherlands, and Switzerland, ring sizes are specified as the circumference minus 40mm. A 50 ISO was a 10 in Switzerland.
In France and Germany the numbers of each sizesimply translates to the circumference of the inside of the ring in millimeters. So a size 40 would mean the inside circumference of a ring is also 40 mm.