Question: When did the former wife of Graf von Bismarck-Schönhausen donate a piece to the Smithsonian she purchased on her honeymoon with a different man?
Sentence (from "Bismarck Sapphire Necklace"): The Bismarck Sapphire Necklace is a sapphire necklace designed by Cartier, Inc. in 1935.
Relevant evidence: No