P63545 Very Large 176.0ct Mt St Helens Helenite Ruby Red July Birthstone Pear Shape Sterling Silver Pendant Volcanic Helenite Pear Pendant #63545. This listing is for the following pendant: Gemstone: Helenite - Fused Volcanic Ash From Mt. Saint Helen's, WA Stone Cut: Pear Stone Size: 176.0 Carats (32mm x 40mm) Metal: 925 Sterling Silver with Rhodium Color: Ruby Red 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.