Ring Size
Ring size is the measurement used to denote the circumference (or sometimes, the diameter) of rings made of jewelry and smart rings.
Instruments to measure
A ring stick that is analogous to sizing
Ring sizes can be measured with a plastic, paper or a metal ring sizer (as a gauge) or simply by measuring the inner diameter of rings that is already fitted.
Ring sticks are instruments used to measure the inner dimensions of rings. They can be made out of wood, plastic, aluminum, and other substances. Digital ring sticks can be used to take extremely precise measurements.
Measuring systems
International standard
ISO 853:2016 defines standard sizes for rings by the inner circumference, measured in millimeters. The ISO sizes are applicable to measure the circumference of a ring in Austria (France, Germany, Belgium and Scandinavia (Norway. Sweden. Denmark. Finland. Iceland.)

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