Regarding the ring size, the inner diameter is listed. (As we are unable to provide tools to measure ring sizes, some slight errors may occur. Thank you for your understanding.) Ring. ◎ The metal fittings are silver-colored plated. Overall, there is discoloration, fading, scratches, and dullness. ◎ Inner diameter: Approximately 17mm (Approximately size 13) ◎ There are scratches, discoloration, fading, and dullness.