Trustmark 925 Sterling Silver 6mm Kiwi Green Created Opal Ball Stud Post Earrings, Margarita Add the beauty of Kiwi Green Opal to your wardrobe with our Margarita line of created Opal earrings Features our popular 6mm bead or ball size which measures about 1/4 of an inch. Made with solid 925 Sterling Silver. Professionally hand-set in our own US studios.