Natural & Synthetic Mixed Stone Stud Earrings for Women, 304 Stainless Steel Stud Earrings, Half Round, Mixed, Size: about 9.5mm in diameter.âPlease Note: These Gemstones may include Synthetic Turquoise & Synthetic Malachite & Natural Green Aventurine & Synthetic Cherry Quartz Glass & Natural Unakite and so on(as the picture shows).