Trustmark 925 Sterling Silver 10mm Tropical Blue Created Opal Round Stud Earrings, Oceans Add the beauty and sparkle of the Pacific to your wardrobe with our Oceans line of created Opal ball stud earrings Features our bold 10mm bead or ball size which measures about 2/5 of an inch. Made with solid 925 Sterling Silver. Professionally hand-set in our own US studio.