The Spectacular 75.47-carat Hooker Emerald The 75.47-carat Hooker Emerald was worn by Ottoman Sultan Abdul Hamid II, the last sultan of the Ottoman Empire. The 75.47-carat Hooker emerald is in the collection of the Smithsonian National Museum of Natural History. Ottoman Sultan Abdul Hamid II, the last sultan of the Ottoman Empire, wore it on his belt buckle. The 75.47-carat Hooker emerald is in the collection of the Smithsonian National Museum of Natural History. Ottoman Sultan Abdul Hamid II, the last sultan of the Ottoman Empire, wore it on his belt buckle.