Trustmark 14k Yellow Gold 10mm Fiery White Created Opal Ball Stud Post Earrings, Lorraine Made with our gorgeous Fiery White Created Opals! Style or Setting: Solid 14k Yellow Gold Cup post for Pierced Ears. Features our bold and stunning 10mm bead or ball size which measures about 4/10 of an inch. Professionally hand-set in our own US studios.