Excellent condition, but please understand that this item has been stored by a private individual. I believe it was size 11, but it's a bit small, so I've listed it as size 10. Alloy yellow gold plate. I believe it's either green agate or green onyx, but I'm not certain. It's a beautifully clear green stone. The retro-style four-prong setting is cute! *This item will be simply packaged.