Art: Queen's Necklace

European auctioneers are hardened to the sad relics of royalty, but not once in a decade does one preside at an occasion so splendidly sentimental as that which drew a swank crowd of Londoners last week to Sotheby's auction rooms in Bond Street. Cherished by four generations of the House of Bourbon, fought over by the three ghostly old sisters of the late Don Jaime, Carlist pretender to the Spanish throne, a famed diamond necklace was finally up for sale by the two sisters who have clung to it since 1931: 68-year-old Blanche...