This document specifies the definition, measurement method, naming and marking of the ring size. This document is applicable to the measurement and designation of the closed ring size.
GB/T 11888-2021 history
2021GB/T 11888-2021 Jewellery—Ring-size—Definition, measurement and designation
2014GB/T 11888-2014 Jewellery.Ring-size.Definition,measurement and designation
2001GB/T 11888-2001 Jewellery--Ring-size--Definition, measurement and designation