These are moissanite (synthetic stone) earrings. Moissanite is a mineral discovered 50,000 years ago from the remains of a meteorite that fell from space. It has a beautiful, eye-catching shine, and is said to have a higher refractive index than natural diamonds, making it about 2.5 times as bright. Natural moissanite is extremely rare, but by successfully creating it artificially in the United States, you can now enjoy its brilliance. It also has excellent durability, making it perfect for everyday use. These earrings feature a large moissanite that shines brightly and 3 moissanite stones set in a way that highlights its shine. You can feel the brilliance even more with the casual swinging feeling of the short swing. * TAKE-UP products are Made in Japan, handcrafted by Japanese craftsmen. Materials 10K Yellow Gold (Posts and Friction Backs are made of 18K Yellow Gold.), Moissanite Size Height 12.0mm, Width 4.6mm * The lengths above are approximate. Product ID: 2685154