Trustmark 925 Sterling Silver 8mm Fiery White Created Opal Ball Stud Post Earrings, Lorraine Features our popular 8mm bead or ball size which measures about 1/3 of an inch. Made with brilliant and fiery created White Opals! Professionally hand-set in our own US studios. Style or Setting: Solid 925 Sterling SilverCup post for Pierced Ears. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.