Few pieces of jewellery suggest blue blood like a tiara does. Worn on the grandest of occasions, they are shimmering visions of wealth, perfectly perched on some of the world's most regal crowns. On Tuesday night at Buckingham Palace, all eyes were on the Duchess of Cambridge as she attended her first state banquet to welcome the Chinese President Xi Jinping and his wife Peng Liyuan. Kate, 33, matched a beautiful red dress by Jenny Packham - a nod to China's flag - with the Lotus Flower tiara once owned by the Queen Mother. The delicate diamond tiara has fan...