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?

full_context: Document 1: George Switzer (mineralogist): George Shirley Switzer (June 11, 1915 – March 23, 2008) was an American mineralogist who is credited with starting the Smithsonian Institution's famed National Gem and Mineral Collection by acquiring the Hope Diamond for the museum in 1958. Switzer made the arrangements when renowned New York City jeweler Harry Winston decided to donate the Hope Diamond to the Smithsonian.
Document 2: Alice Heine: Alice Heine (February 10, 1858 – December 22, 1925), styled HSH The Princess of Monaco, previously The Duchess of Richelieu, was the American-born second wife of Prince Albert I of Monaco, a great-grandfather of Prince Rainier III of Monaco and great-great grandfather of reigning prince Albert II of Monaco. Marcel Proust used her as a model for the "Princesse de Luxembourg" in his novel, "In Search of Lost Time". Her first husband was the Duke of Richelieu, and one of the titles of her second husband was the Duke of Mazarin; she was thus unique in bearing the titles of both Cardinal Richelieu and Cardinal Mazarin.
Document 3: The Jane Seymour: The Jane Seymour is a 2.08carat cushion-cut fancy vivid blue diamond in an 18-karat rose gold-plated platinum setting. Mined in Russia in 2014 and crafted in Geneva, it was inspired by and named in honor of British-American movie, television, and stage actress Jane Seymour, OBE.
Document 4: Uncle Sam (diamond): Uncle Sam is the nickname for the largest diamond ever discovered in the United States. It was found in 1924 in Murfreesboro, Arkansas at the Prairie Creek pipe mine, which later became known as the Crater of Diamonds State Park. The diamond was named "Uncle Sam" after the nickname of its finder, Wesley Oley Basham, a worker at the Arkansas Diamond Corporation.
Document 5: Guido Henckel von Donnersmarck: Guido Georg Friedrich Erdmann Heinrich Adalbert Graf Henckel von Donnersmarck, from 1901 Prince ("Fürst") Henckel von Donnersmarck (born 10 August 1830 in Breslau, died 19 December 1916 in Berlin) was a German nobleman, industrial magnate, member of the House Henckel von Donnersmarck and one of the richest men of his time. He was married in his first marriage to the famed French courtesan Esther Lachmann, known as La Païva, of Russian Jewish origin.
Document 6: Bismarck Sapphire Necklace: The Bismarck Sapphire Necklace is a sapphire necklace designed by Cartier, Inc. in 1935. As of 2010, the necklace is on display between the Hall Sapphire and Diamond Necklace and the Logan Sapphire in the Janet Annenberg Hooker Hall of Geology, Gems, and Minerals at the Smithsonian Institution's National Museum of Natural History in Washington D.C., United States. It is named after Countess Mona von Bismarck, who donated the piece to the Smithsonian in 1967. The sapphire itself was mined in Burma (now Myanmar, and was purchased by the Countess in Sri Lanka in 1926 during her honeymoon with Harrison Williams.
Document 7: Taylor–Burton Diamond: The Taylor–Burton Diamond, a diamond weighing 68 carat , became notable in 1969 when it was purchased by actors Richard Burton and Elizabeth Taylor. Burton had previously been the underbidder when jeweller Cartier bought the diamond at auction for $1,050,000, setting a record price for a publicly sold jewel. Thousands of people in New York and Chicago queued to see the diamond after its 1969 sale. It was subsequently worn by Taylor at Princess Grace of Monaco's fortieth birthday, and at the 42nd Academy Awards.
Document 8: Pamela Harriman: Pamela Beryl Harriman ("née" Digby; 20 March 1920 – 5 February 1997), also known as Pamela Churchill Harriman, was an English-born American socialite who was married and linked to important and powerful men. In later life, she became a political activist for the Democratic Party and a diplomat. She was married three times, her first husband being Randolph Churchill, the son of prime minister Winston Churchill. Her only child, Winston Churchill, was named after his famous grandfather.
Document 9: Marella Agnelli: Marella Agnelli, born Donna Marella Caracciolo di Castagneto (born 4 May 1927) is an Italian noblewoman, art collector, socialite, style icon and widow of former Fiat chairman Gianni Agnelli. She has often appeared in the fashion magazine "Vogue." She was named to the International Best Dressed List Hall of Fame in 1963.
Document 10: Fürst von Bismarck: The great German statesman and diplomat Otto von Bismarck (1815–1898) received several noble titles during the course of his career. Already born into a noble Junker family, the House of Bismarck, he began life as simply "Mr (German:"Herr") Otto Eduard Leopold von Bismarck".
Document 11: Heart of the Ocean: The Heart of the Ocean (also known as Le Cœur de la Mer) is the name of a fictional blue diamond featured prominently in the 1997 film "Titanic". In the story, the diamond was originally owned by Louis XVI and cut into a heart shape after the French Revolution. In the film the necklace was purchased by Caledon Hockley, played by Billy Zane, a week before he sailed on the ill fated ocean liner Titanic. The necklace was meant to be given as an engagement present to his fiancee Rose, played by Kate Winslet and Gloria Stuart. It is believed that both Rose and the necklace went down with the ship, leading some of the main characters to believe the necklace lies somewhere within the wreckage of the Titanic.
Document 12: Leona Helmsley: Leona Mindy Roberts Helmsley (born Lena Mindy Rosenthal; July 4, 1920 – August 20, 2007) was an American businesswoman. She was known for her flamboyant personality and had a reputation for tyrannical behavior that earned her the sobriquet Queen of Mean. She was promoted by the Beber Silverstein Group and its co-founder Joyce Beber persuaded Helmsley to replace that title with Queen of the Palace Hotel instead.
Document 13: Gachalá Emerald: The Gachalá Emerald, one of the most valuable and famous emeralds in the world, was found in the year 1967, in the mine called Vega de San Juan, located in Gachala, a town in Colombia, located 142 km from Bogota. Gachalá Chibcha means "place of Gacha." Presently the emerald is in the United States, where it was donated to the Smithsonian Institution by the New York City jeweler, Harry Winston.
Document 14: Krupp Diamond: The Elizabeth Taylor Diamond, formerly known as the Krupp Diamond, is a 33.19 carat diamond that was bought by Richard Burton for his wife, Elizabeth Taylor in 1968. The Krupp diamond was one of a number of significant pieces of jewellery owned by Taylor, her collection also included the 68 carat Taylor–Burton Diamond, which was bought by the couple in 1969. The Krupp diamond was sold by Taylor's estate in 2011 for $8.8 million.
Document 15: Mona von Bismarck: Mona von Bismarck (February 5, 1897 – July 10, 1983), known as Mona Bismarck, was an American socialite, fashion icon, and famed beauty. Her five husbands included Harrison Williams, said to be the richest man in America, and the Graf von Bismarck-Schönhausen, grandson of German Chancellor Otto von Bismarck. Mona was the first American to be named "The Best Dressed Woman in the World" by a panel of top couturiers including Chanel, and was also named to the International Best Dressed List Hall of Fame.
ground_truth: 1967