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 "Galaxy opal"): The weight of the finished stone was beyond the capacity of any gem measuring scale at the Gemological Institute of America and an approximation of its weight in carats had to be determined using a postal scale.
Relevant evidence: No