Ring Size
Ring size is a measurement used to describe the circumference (or sometimes, the diameter) of jewellery rings as well as smart rings.
Tools for measuring
A stick analogic to sizing
Ring size can be determined physically with a plastic, paper or a metal ring sizer (as an example) or simply by measuring the inner diameter of a ring that already fits.
The ring sticks can be used to measure the rings' diameters inside. They are typically made of delrin, plastic, or wood and may also include various types of materials. Rings can be made using digital sticks to get precise measurements.
Measuring systems
Standard international
ISO 8653:2016 defines standard ring sizes as the inner circumference measured in millimetres. ISO sizes are widely used to measure the circumference of rings in Austria, France, Germany, Belgium, Scandinavia (Norway, Sweden, Denmark, Finland, Iceland), as well as other countries within Continental Europe

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