Lucapa Recovers 171-carat Diamond(IDEX Online) - Lucapa has recovered the fourth largest diamond since it started mining at Lulo, Angola, five years ago.The gem-quality white stone weighs 171-carat and is the 15th diamond over 100-carats from the mine.In February 2016, Lulo yielded an enormous 404.2-carat white diamond, the biggest ever recovered in Angola, and the biggest in the history of Australia-based Lucapa. The "4th February Stone" sold for $16m.The Lulo open pit, in Angola's eastern Lunda Norte province, is the world's highest dollar per carat alluvial diamond operation, It went live in January 2015.Managing director Stephen Wetherall said: "The recovery of this 171-carat gem-quality white diamond continues to underpin the potential of the kimberlite exploration programme as drilling of the high-priority kimberlites in the Canguige catchment continues."