R6422G Victorian-Style Mt St Helens Green Helenite Gemstone Halo Sterling Silver Ring Gemstone: Helenite - Fused Volcanic Ash From Mt. Saint Helen's, WA Stone Cut: Rectangle Checkerboard Stone Size: 3.4ct - 10mm x 8mm Metal: 925 Sterling Silver Color: Green Setting: Prong Origin: Washington, USA *Because we use natural stones, the stones may vary slightly in shape, size, and color. * About Helenite: Helenite is a gemstone that resulted from volcanic ash and rocks and is also referred to as emerald obsidianite, Mount St. Helen obsidian. The volcano erupted on May 18, 1980, and ejected igneous rock from 10-20 miles underground.