This is a citrine heart ring from Bijumam (ビジュマム). There is no certificate of authenticity for the stone. The ring material is brass. I purchased it at a store and have kept it stored away. Please check the images for the size. ■Citrine x Heart Ring There is a "Bijumam" engraving on the inside of the ring. Returns and cancellations are not accepted, 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 identical to one from a store or if you are sensitive about such matters. Thank you.