P4236B Mt St Helens Helenite Swiss Blue Cross Sterling Silver Pendant Gemstone: Helenite Stone Cut: Oval Stone Dimensions: 4mm by 6mm Metal: 3.1 grams of 925 Sterling Silver with Rhodium Color: Ruby Red 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. The fury of the volcanic eruption is a wondrous occurrence in nature. The beauty that has been created from itHeleniteis a fantastic thing to hold.