Rainbow Hearts: 925 Sterling Silver Heart Hoop Earrings for Women and Girls. Colorful and Expressive Huggie Earrings -Ideal Gifts for Women and Girls Experts believe that the silver alloy used today as sterling silver comes from continental Europe in the 12th century. Pure silver proved to be a soft and easily damaged material. Combined with other metals that are most commonly used, it creates a harder material that you can rely on. Jewellery care: 1. Do not contact liquids such as water, sweat and cosmetics. 2. Do not wear when showering, washing, swimming, sports. 3. Please wear it carefully, do not scrub it or let it fall to the ground. Q:Will I get skin irritation? A:The materials are environmentally friendly materials made of 925 sterling silver. So please do not worry about skin irritation.