These moonstone studs are so beautiful and are going to fetch compliments wherever you wear these to. It has a post at back closure.- Sterling Silver with 18K Gold plating and 925 hallmark- Semi-precious gemstones- Perfect for sensitive skin- E-coating to prevent tarnishing- To keep a long-lasting shine, do not expose to prolonged heat, water, and moisture- Do not wear while swimming or showering- Comes with authenticity certificate