Trustmark 925 Sterling Silver 6mm Black Created Opal Faceted Screw Back Stud Earrings, Aurora Add the beauty of Black Opal to your wardrobe with our Aurora line of created Opal earrings Style or Setting: Diamond-cut faceted basket-set screw-back stud earrings for pierced ears. Made with solid 925 Sterling Silver. Professionally hand-set in our own US studio.