Natural Gemstone Stud Earrings for Women, with 304 Stainless Steel Ear Studs, Square, Size: about 6mm wide, 6mm long, pin: 0.8mm.âPlease Note: These Gemstone may include Natural Sunstone, Pink Opal, Amethyst and so on(as the picture shows). but as it is a mixed product, the stone type is delivered randomly, please refer to the actual product delivered.