Purchased on 2025.11.24 8mm Inner diameter 19cm Lapis lazuli is a natural stone used by humans since ancient times, characterized by its deep blue color with golden flecks. Its Japanese name is "Ruri" (瑠璃) or "Aokinseki" (青金石), and its name comes from the Latin word "lapis," meaning "stone," and the Persian word "lazuli," meaning "blue" or "sky." Features: Primarily composed of lazurite (lapis lazuli), it contains golden flecks of pyrite (iron pyrite) and white patterns of calcite. History: Revered as a "sacred stone" since ancient times, it was used in the golden mask of Tutankhamun in ancient Egypt. It was also used as a pigment and was used in Vermeer's paintings.