This is a Bijumam amethyst petite ring. There is no certificate of authenticity for the stone. The ring material is brass. It was purchased in-store and worn once. Please check the images for the size. ■ Amethyst x Petite Ring "Bijumam" is engraved on the inside of the ring. We do not accept returns or cancellations, so please ask any questions you may have before purchasing. Also, this is a pre-owned item stored in a private home. Please refrain from purchasing if you are looking for a product in the same condition as one from a store or if you are sensitive about such matters. Thank you for your understanding.