The Archduke Joseph Diamond

The Archduke Joseph Diamond

Christie's Images Ltd. 2012 via Bloomberg

The Archduke Joseph Diamond. The internally flawless stone, weighing 76.02 carats, originated from the Golconda mines in India. It was sold by Christie's International during its jewel auction in Geneva, Switzerland, on Nov. 13, 2012 for a price of $21.5 million.