carat diamond for $35.3 million Friday, breaking a record as the highest price ever paid for a rough diamond. Analysts had estimated the value of the stone, one of the 20 biggest high-quality rough diamonds, at around $25 million. “It is fitting that the Cullinan Heritage should achieve a sale price of $35.3 million, the highest sale price on record ever achieved for a rough diamond, as it has the potential to produce one of the world's most important polished gems,” Chief Executive Johan Dippenaar said. London-listed Petra said in a statement the gem was purchased in a tender by Chow Tai Fook Jewelery Co Ltd in Hong Kong. Petra found the gem last September at its 74 percent owned Cullinan mine in South Africa. The Cullinan mine has been the source of many large diamonds, including the world's largest rough diamond - the Cullinan
