Black Studs, Earrings for Women, Black Gemstone Earrings, Unique Jewelry, Black Post Earrings, Onyx Stud Earrings, Black Button Earrings. Silver-plated natural brass post earrings. These black Onyx (or other gemstones from the list) button-shaped studs, are simple & elegant, & wonderful to wear on a daily basis. ❀ Features: ✓ Made of silver-plated brass (Natural metal made of zinc & copper) / Gold brass ✓ Black Onyx gemstone (or other gemstones from the list) ✓ Dimensions: 0.35 inches / 0.9 cm Black Studs, Earrings For Women, Gemstone Earrings, Unique Jewelry, Post Onyx Stud Button Earrings