Trustmark 925 Sterling Silver 10mm Fiery White Created Opal Ball Stud Post Earrings, Lorraine Features our bold and stunning 10mm bead or ball size which measures about 4/10 of an inch. Made with created Fiery White Opals! Professionally hand-set in our own US studios. Style or Setting: Solid 925 Sterling SilverCup post for Pierced Ears.