Authentic and in pre loved condition Size 54 about a women’s 6 3/4 Width is 4mm Has 1 diamond totaling .02 carats Purchased in 2013 Make me an offer Sold with Cartier ring box and store bag I do not have the certificate, but Posh will authenticate and you can call the Cartier store in Beverly Hills (where it was purchased) to authenticate with its corresponding serial number.