question: In which year was Reverend Chauncy Hare Townshend's collection of gems was bequeathed to the museum?
sentence: Other items in the collection include diamond dress ornaments made for Catherine the Great, bracelet clasps once belonging to Marie Antoinette, and the Beauharnais emerald necklace presented by Napoleon to his adopted daughter Hortense de Beauharnais in 1806.