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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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Earn +20 ptsQ: What is the diameter of a size 9 ring?
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