The De Beers Group of Companies saw a healthy demand for rough diamonds in the third sales cycle of 2017.
The company reported $580m (£467m) worth of rough diamonds were sold during the period, an increase from the $553m (£445m) sold in the second sales cycle.
However, figures decreased in the third cycle compared to the same period in 2016 which achieved $666m (£535m).
Bruce Cleaver chief executive officer for the De Beers Group said: “We saw the continuation of good rough diamond demand in Cycle three across the product range. This reflected positive sentiment from our customers following the Hong Kong International Jewellery Show in March.”