Sterling Silver Rare Volcanic Lava Rock Ring, Size 7.75 Volcanic Lava Rock; Diameter: 0.4" Solid .925 Sterling Silver; Weight: 2.8 grams Genuine Stone. Each item comes shipped in a jewelry box. You are looking at a one of a kind piece, the pictured jewelry will be the same exact piece you'll receive. Each item is designed and handcrafted by our artisans.