Petra Diamonds will hold a special tender of the 20.08-carat blue diamond. The stone, a gem-quality Type llb diamond, was recovered from the Cullinan mine in South Africa last month.
Viewings will take place at Petra’s diamond marketing offices in Johannesburg from November 1-7 and at the Diamond and Exchange and Export Center from November 8-15.
South Africa’s Petra Diamonds could make up to $15 million for a 20.08 carat blue rough diamond it recovered in September at its iconic Cullinan mine, when it goes for sale at a planned tender in Johannesburg next month.
Investment bank Berenberg valued the “exceptional” blue gem quality diamond at between $10 and $15 million, based on prices Petra has achieved for similar roughs from Cullinan in previous years. In 2015, the miner sold “The Blue Moon of Josephine”, a 29.6 carat blue stone, for $48.5 million, marking a world record price per carat at auction for any diamond at the time.