The world’s most admired diamonds from the Golconda mine exceeds in expectations at auction this week. We recently posted about the Archduke Joseph Diamond aka “The Big Joe”, discovered from the world’s famous and oldest diamond mine in Golconda, India. This huge 76.02 carat, internally flawless diamond went on auction this week in Geneva, and was bought for a whopping £13.5 million, exceeding its estimate of £9.5 million. The diamond also tripled its price when it was last sold at auction in 1993 when it sold for £4 million. The diamond is named after the Archduke Joseph August of Austria, who was the great grandson of a French king and a Holy Roman. During World War One and Two the diamond was deposited in a vault to keep safe. The diamond was than auctioned in 1961 in London. Jean Marc Lunel, Christies Diamond auctions expert said that the diamond is extremely valued, due to its high quality colour, shape, cut and clarity.