These Black Round Stud Earrings feature a sleek silver tone design with a screw back closure for secure wear. Made of glass (and metal, these earrings are perfect for adding a touch of elegance to any outfit. The minimalist stud style and classic round shape make them versatile and suitable for everyday wear. Ideal for those looking for a subtle yet stylish accessory. I assume these are glass as they are cold to the touch, they could also be a natural stone, shiny and smooth. Vintage. Cleaned and ready to wear!