Trustmark 925 Sterling Silver 8mm Natural Nephrite Green Jade Ball Stud Post Earrings Made with Natual Nephrite Green Jade Features our sytlish 8mm size which is about 1/3 of an inch. Metal Components:Solid 925 Sterling Silver. Hallmarked. Professionally hand-set in our own US studios. Style or Setting:Cup post for Pierced Ears.