A rare 20.08 carat blue diamond mined at Petra Diamonds Cullinan Mine east of Pretoria, South Africa sold for US$14.9 million.
JOHANNESBURG - Petra Diamonds Ltd. sold a 20-carat blue gem for almost $15 million, a major boost for the company that’s struggling with a mountain of debt and falling diamond prices.

The company found the diamond in September at its Cullinan mine, famous for producing expensive gems including those in the British crown jewels. Blue gem-quality stones are among the most valuable in the world, and the diamond sold for $741,000 per carat.

Petra shares jumped as much as 11%, the most in more than a month, to 9.45 pence. The buyer wants to remain anonymous, Petra said in a statement Friday.

The company has had a rough few years. Its share price collapsed to a record low last month amid falling diamond prices and concerns that it will struggle to repay debts. In September, it wrote down the value of its mines by almost $250 million and said co-founder and Chairman Adonis Pouroulis will leave. That followed the departure of Petra’s long-serving chief executive officer earlier this year. 

The company found the diamond in September at its Cullinan mine, famous for producing expensive gems including those in the British crown jewels. Blue gem-quality stones are among the most valuable in the world, and the diamond sold for $741,000 per carat.
Petra has slid from a peak value of more than $1.5 billion as it redeveloped the Cullinan mine, where the world’s biggest diamond was found in 1905. The cost of that project saw Petra’s debts swell, just as the diamond market weakened. 

Petra Diamonds Ltd. sold a 20-carat blue gem for almost $15 million, a major boost for the company that’s struggling with a mountain of debt and falling diamond prices.


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