Bonhams bags $8.2m for pear-shaped diamond weighing almost 18 carats.An unmounted 17.82 carat pear-shaped diamond was the star of an
Bonhams in London to sell writer's hidden diamond-set treasures.Bonhams in Knightsbridge, London, is set to auction off crime author Agatha Christie's family jewels, with the collection of diamond pieces revealing a story of their very
