Trustmark 925 Sterling Silver 6mm Tropical Blue Created Opal Ball Lever Back Earrings, Oceans Add the beauty and sparkle of the Tropics to your wardrobe with our Oceans line of created Opal ball drop leverback earrings Style or Setting: Ball Drop Leverback Earrings for Pierced Ears. Made with solid 925 Sterling Silver. Professionally hand-set in our own US studio.