The diameter of a size 9 ring is approximately 19.0 millimeters (or about 0.75 inches). Ring sizes can vary slightly by manufacturer, but this measurement is generally accepted for a U.S. size 9. It's important to consider that the fit may also depend on the design and width of the ring.
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19.5 ring size is
If the ring is 2 cm in diameter, the US ring size is 10 and a quarter. In terms of British and Australian size, it is said to be U.
9 times bigger
the numbers 6,7,8,9or10 would just be the ring size sometimes they put the size in the inside of the ring but if it has any other # or letters in it it could be real.
i believe you mean US sizes Diam = 20.7 mm Circum = 64.1 mm