When purchasing jumprings for general use, like connecting a bead drop to an earwire or a clasp to chain, as a general rule of thumb, if I need 6mm ID I would purchase 8mm OD 18-gauge. This is not a scientific comparison it is just my rough conversion.
When you need the calculation to be specific for something like chain mail, it is best to work closely with one company who can help you determine which rings will work for you. When making your own jumprings, a few things to consider are:
The wire gauge
Each metal measures differently and wire gauge is not a very specific unit of measurement. Having the measurement of the wire in millimeters is best.
How the wire was wound around the mandrel and how the metal reacts to the process
Each metal has a temper (hardness) and each metal reacts differently to the tension created in winding.
Before starting a project, determine which size works and purchase or make enough of that size so you can complete your design.
- Kristal Wick, Designer, Author, Jewelry Making Expert and Swarovski Ambassador
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