Obsidian is formed when molten lava cools rapidly. When white marks form by internal bubbles or crystallites, it is known as Snowflake Obsidian. Set in sterling silver with an oxidized frame and decorative bail, the setting behind the stone is left open. Total length – 65 mm x 30 mm wide (2.5″ x 1.25″). Weight – 14 grams. Lapidary and design work by John Delong.