Trustmark 925 Sterling Silver 6mm Blue-Green Peacock Created Opal Ball Stud Earrings, Perrin Add the beauty of Blue-Green Peacock Opal to your wardrobe with our Elana line of created Opal ball stud earrings Style or Setting: Ball Stud Earrings for Pierced Ears. Made with solid 925 Sterling Silver. Professionally hand-set in our own US studio.