Lucara sold the Constellation to Nemesis InternationalPlease note that It's a fact that Lucara sold the Constellation to Nemesis International DMCC already in May 2016.
https://www.lucaradiamond.com/newsroom/news-releases/lucara-sells-its-813-carat-diamond-for-us-63-million-the-highest-price-ever-achieved-for-the-sale-o-122540/