Regarding ring sizes, the inner diameter is listed. (As we are unable to prepare tools to measure ring sizes, there may be some slight errors. Thank you for your understanding.) This is a ring. ◎ The metal is SILVER. The SILVER stamp is partially cut off. ◎ Inner diameter: Approximately 15.5mm (Approximately size 9) ◎ There is discoloration, dullness, and scratches.