I haven't used this, and it's been stored at home for many years. It's a very beautiful pearl. 1.5 x 1.3 (cm) Bail: 0.6cm *Measurements are approximate. It's WG (White Gold). There is no certificate of authenticity or case. Although I haven't used it, I'm selling it as a used item. Please consider carefully before purchasing. Please refrain from purchasing if you are sensitive to imperfections or think you might regret it. I cannot accept claims or returns. I am also selling this on other sites, so please be sure to confirm availability with a comment before purchasing.