{{Information |Description=Logan Sapphire, 423 carats, Sri Lanka. Among the world's largest-known faceted blue sapphires, this extraordinary stone is the heaviest mounted gem in the National Gem Collection. It is framed by 20 diamonds totaling 16 carats.
National Museum of Natural History is a tourist attraction, one of the Museums in Washington, United States. It is located: 21 km from Arlington, 171 km from Baltimore, 600 km from Philadelphia. Read further
