Petra Diamonds
The Cullinan mine continues to produce large stones. The Cullinan Heritage, a white diamond, was discovered in September 2009. This stone was the 19th biggest uncut diamond ever found and was sold in February 2010 to Chow Tai Fook Jewellery for $35.5m, the highest price ever paid for an uncut diamond. The previous record was held by Gem Diamonds' Leseli La Letšeng, which was bought for $18.4m by Graff Diamonds in December 2008.
Economy of Botswana
Since the early 1980s, the country has been one of the world's largest producers of gem diamonds. Four large diamond mines have opened since independence. De Beers prospectors discovered diamonds in northern Botswana in the early 1970s. The first mine began production at Orapa in 1972, followed by a smaller mine at Letlhakane. What has become the single richest diamond mine in the world opened in Jwaneng in 1982. The mine was discovered when termites looking for water brought grains of diamond to the surface. Botswana produced a total over 30 million carats (6,000 kg) of diamonds (about 25% of worldwide production) from the three Debswana mines in 1999, and is the highest producer of diamonds by value in the world. According to Debswana, the Orapa 2000 Expansion project increased the Orapa's mine annual output from 6 million carats to 12 million carats and raised total production to 26 million carats. In 2003, Debswana opened the Damtshaa diamond mine about 220 kilometres (140 mi) west of the city of Francistown. The mine was placed into care and maintenance in December 2015 due to weak global demand but was scheduled to reopen in January 2018.
In 2008, Australia's Kimberley Diamond Company opened a mine in Lerala, Botswana's fifth mine and the first not operated by Debswana. However, Kimberley shut down the mine in May 2017, citing weak market conditions.