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Jewelry Wire Size Guide: Wire Gauge to Millimetres Explained When shopping for jewelry wire, one of the most common questions is: “What does wire gauge mean in millimetres?” If you have ever seen wire listed as 20 gauge, 24 gauge, or 26 gauge and wondered how thick it actually is, you are definitely not alone. Jewelry wire sizing can be a little confusing at first because many wires are measured using the gauge system, while beads, findings, and finished jewelry measurements are ofte …