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Take a piece of string. Wrap it around your finger, being sure that it neither too tight to bind and that you can slide it over your knuckle without difficulty, nor so loose that it will slip over your knuckle almost by itself and thus easily fall off. when you have found this comfort zone, mark the string where the ends cross and then measure the length of this piece in mm. An on-line reference or a jeweler can then tell you what ring size this measurement corresponds to.

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Q: How do you measure your ring size finger without a measuring device?
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