The most costly blue rock aka Cullinan’s Blue Diamond has been christened by its pompous owner. Weighing 7.03 carats, this cushion-shaped diamond will now be known as ‘Star of Josephine’. Also it is now clear that this record-breaking blue diamond was purchased by Hong Kong collector Joseph Lau Luen-Hung for $ 9,500,000. “Mr Lau bought the diamond for HK$74-million (US$9.48-million or R80.53- million) and he has already exercised his right to name the diamond, which is now known as ‘Star of Josephine’,” said the company, Petra Diamonds.
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