Curator Caroline de Guitaut stands behind the Delhi Durbar necklace and Cullinan pendant made up of diamonds and emeralds, created for the Delhi Durbar of 1911 and owned by Queen Mary, at a new exhibition at Buckingham Palace in London on June 28, 2012. The exhibition shows jewels collected by six monarchs over three centuries to mark the Queen's Diamond jubilee this summer. (Associated Press/Stefan Rousseau/PA Wire)

Photo by: Stefan Rousseau

Curator Caroline de Guitaut stands behind the Delhi Durbar necklace and Cullinan pendant made up of diamonds and emeralds, created for the Delhi Durbar of 1911 and owned by Queen Mary, at a new exhibition at Buckingham Palace in London on June 28, 2012. The exhibition shows jewels collected by six monarchs over three centuries to mark the Queen's Diamond jubilee this summer. (Associated Press/Stefan Rousseau/PA Wire)