De Beers, the world’s largest diamond producer by value, revealed on Friday it made about three times as much in sales of roughs in the seventh sales cycle of the year as it did in the previous event.

The Anglo American unit, which sells diamonds to a handpicked group of about 80 buyers 10 times a year at events called sights, sold $320 million worth of rough diamonds in the seventh cycle. That compares to the $116 million fetched in the previous sight and is not far behind the $400 million De Beers sold on average each month last year.