Aura by TJM 925 SS 0.64 cttw Checkerboard-cut Black Onyx with 0.05 cttw Marcasite Ring Silver Jewelry with gemstones Double Round Shape Ring Set With Semi-Black Onyx & Marcasite 925 sterling silver metal Product Dimension: 12.97mm x 18.65mm x 4.42mm Product Weight: 5.20 grams Sterling silver jewelry made with great quality marcasite