Lapis Lazuli stone (Lapis Lazuli) Afghan weighing 19.311 carats

Technical details: Type: Lazurite (Lapis Lazuli) (Lapis Lazuli) weight: 19.311 carats dimensions (mm): 16.17x11.10x6.09 shape: oval cabochon (Cabochon) color: deep blue clarity: ungraded transparency: opaque hardness: 5.0-5.5 treatment: untreated origin: Afghanistan certification: certificate from Saudi Laboratory (MT) - website (www.mtgl.com.sa) Lapis Lazuli is a dense dark blue rock, not a single mineral, mainly composed of lazurite mineral with varying amounts of other minerals such as pyrite, which appears as golden spots, and calcite, which appears as white lines or spots. Lazurite is known for its rich deep blue color, which was historically used as a dye "Ultramarine blue."