Gems and Minerals Exhibit, National Museum of Natural History, by Unknown, 1958, Smithsonian Archives - History Div, The new Gems and Minerals Exhibit in the National Museum of Natural History. Part of the Exhibits Modernization Program initiated under Secretary Carmichael, the reinstallation features sleek terrazzo floors and curving modernist wall partitions to create architectural variety out of the classical beaux-arts formality of the original building..