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de GRISOGONO ACQUIRES THE CONSTELLATION, THE WORLD’S MOST EXPENSIVE ROUGH DIAMOND 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 today. The purchase represents a ground-breaking moment for the company in its journey to become one of the world’s leading high jewellery and watch brands. Measuring over six centimetres wide, The Cons
