Thank you for viewing. This is a ring with a retro design. I believe it's probably glass. It's approximately size 11, but please understand that this is a rough measurement. It has a 925 stamp, so I believe it's sterling silver. Please refrain from purchasing if you are sensitive to items stored at home. Non-smoker, no pets. Will ship via Mercari delivery. Cancellations and claims after shipping are not accepted to prevent product switching. No price reductions.