This is really gorgeous Mahogany Obsidian in large and small pieces--some call it Leopard Skin Obsidian--it takes an extremely high polish, but there's a trick. The trick is to start a batch with 50% Ceramic Shape Mix and then grind out the imperfections & spalled areas after two weeks in Stage 1. Then take your time in subsequent stages, making up for lost volume with more Ceramic Shape Mix. Break it to quarter size or slightly larger for a jewelry mixture. This is 5-Lbs of Mahogany Obsidian in a bag at $4.75/Lb.