Auction highlights across this year do far – tiaras, the largest pink diamond jewel ever sold, prestigious Ottoman Iznik pottery and iconic paintings. Starting off the year was the Bonhams Photographs auction at New York in April which featured works by Ansel Adams, Henri Cartier-Bresson, Alfred Stieglitz, Helmut Newton, Ormond Gigli (the famous Girls in the Windows), and Steve McCurry (the equally famous Sharbat Gula, Afghan Girl, a dye bleach print of which sold for...