At the 11th International Kimberlite Conference, a report made by senior research scientists at the Gemological Institute of America (GIA) believes the 1,109-carat Lesedi La Rona — the second largest rough diamond ever found — actually weighed at least 2,774 carats before it fractured into five pieces during the sorting process at Lucara's Karowe mine in Botswana in November 2015. Report to be find on this link: http://11ikc.com/long_abstract/11IKC%20Long%20Abstracts/11IKC_46

The rights to the world’s most expensive rough diamond, the 813-carat diamond dubbed “The Constellation”, has been purchased by Swiss jeweler De Grisogono. To mark the opening of the 28th Biennale des Antiquaires, de GRISOGONO is delighted to announce the acquisition of The Constellation, the world’s most expensive rough diamond, at a press conference held in the Grand Palais 10 may 2016. The purchase represents a ground-breaking moment for the company in its journey to becom