Trustmark 925 Sterling Silver 4mm Created Black Hematine Ball Stud Post Earrings with Rhodium Finish Made with Created Black Hematine Features our petite 4mm size which is about 1/6 of an inch. Metal Components:Solid 925 Sterling Silver with a bright Rhodium Finish. Hallmarked. The 6mm size is shown for display purposes only. Style or Setting:Cup post for Pierced Ears.