On a night when the highly touted, 100.94-carat, D-flawless "Spectacle" diamond was supposed to be the star of Christie's Geneva auction, it was a 19th century sapphire-and-diamond crown that earned the loudest applause. The crown once worn by Queen Maria II of Portugal (1819-1853) sparked a bidding war that yielded a final price of 1.77 million […]