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The gauge is the thickness of the jewelry (Usually the thickness of the wire the jewelry is made from but may also be the diameter of a plug or eyelet). From 20 gauge to 00 gauge, the smaller the number is, the thicker the jewelry is. After 00, the diameter of body jewelry is usually measured in fractional inches

A 0 or 5/16" gauge is 0.325 decimal inches or 8.251 millimeters

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15y ago

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