Question: George Shirley Switzer started the Smithsonian Institution's famed National Gem and Mineral Collection by acquiring what jewel weighs 45.52 carats?
Sentence (from "Smithsonian Libraries"): Smithsonian Libraries (SIL), formerly known as Smithsonian Institution Libraries, is a library system comprising 20 branch libraries serving the various Smithsonian Institution museums and research centers, as well as central support services which include a Book Conservation Laboratory and an Imaging Center.
Relevant evidence: No