Operating profit increased by 129 per cent from USD 249 million to USD 571 million in the first six months against the same period the year before mainly due to Anglo American taking a controlling stake.
"During the first half of 2013, we saw encouraging signs of stability and moderate growth in the major diamond consumer markets of the USA and China," said De Beers Group CEO Philippe Mellier in a statement.
"While polished diamond prices have increased slightly during the period, trading conditions remained challenging for our rough market partners."
Production increased by nearly one million carats to 14.3 million carats.
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Rough diamond prices rose six per cent in the first six months against a 12 per cent fall in the same period last year.
Last year, De Beers' total sales dropped 16 per cent to USD 6.1 billion.
"Looking forward, while the market continues to experience volatility and macro-economic uncertainty, we remain cautiously optimistic that the growing strength exhibited in the polished market, particularly in the USA, will translate to overall global growth for the year," said Mellier.
The remaining 15 per cent is owned by the Botswana government.
Officially headquartered in Luxembourg, the company is run from London and Johannesburg.