Ring Size
Ring size is the measurement used to define the circumference (or sometimes, the diameter) of rings made of jewelry and smart rings.
Instruments for measuring
A ring stick with an analogous sizing
Measurements of ring sizes can be accomplished using the use of a metal, paper or plastic ringsizing device (as as an indicator) or using a ring's internal diameter.
Ring sticks can be used to determine the diameter of rings' inner edges. They are typically made out of delrin, plastic, wood, and can also be made of various types of materials. You can use digital ring sticks for exact measurements.
Measuring systems
International standard
ISO 8653:2016 defines standard ring sizes as the inner circumference measured in millimeters. The ISO sizes are available to measure the circumference of a ring in Austria (France, Germany, Belgium and Scandinavia (Norway. Sweden. Denmark. Finland. Iceland.)

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