Not sure what size you need? This calculator will tell you exactly what Ring Maker Mold to use with what metal clay.
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Inexpensive yet very handy measuring tool for ring sizes.
Use this handy gauge set to measure fingers for standard-width rings. Sizes 1–15 are clearly stamped on gauges in half-size increments. Constructed of bright nickel-plated flat stock.
Plastic Adjustable Ring Sizer. Marked in quarter sizes. (U.S. sizes 1-17.5