Miansai's Lennox Pendant Necklace blends modernized materials with vintage inspired design. Black onyx is set inside a square gold vermeil frame and hangs on a 18-inch chain. Base Metal: Sterling Silver Plating: Polished 14k Yellow Gold Material: Onyx Stone Pendant Dimensions: W 8mm x H 11mm Chain Length: 18 inches Gauge: 1.3 mm