R6497G Classic Mt St Helens Green Helenite May Birthstone Rhombus Cut W/CZ Sterling Silver Ring Product Information: Stone Type: Forest Green Helenite Stone Origin: Washington, USA Stone Weight: 4.5 Carats Stone Size: 10mm x 15 mm Metal: Solid 925 Sterling Silver w/ Rhodium Finished Silver Weight: 3.35 Grams Suggested Retail Price: $110.00 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. Helenite is made by fusing this material at 2700° F, which we facet and polish.