This gem is the finest quality Lapis Lazuli. It has no pyrite or calcite inclusions and shows nothing but the classic ultramarine blue color that was admired by great artists like Leonardo da Vinci, who used actual powdered Lapis of this hue to make pigments for his timeless paintings. This pear-shaped gem measures approx.. 11 x 15.3 x 4 mm. and weighs 5.28 ct. No treatment of any kind. Many lapis stones are waxed to enhance the polish but the fine finish on this top quality stone needed no enhancement. Pronounced LA:pis la:Zoo:lee, Lapis is an alternate birthstone for December. (Some care, N).