Diamond production in Sierra Leone fell 33 percent to 28,110 carats in April from a month earlier, the country’s central bank said in its monthly economic review.

The amount includes 13,080 carats of industrial-grade diamonds and 15,030 carats of gems, according to the statement that was handed to reporters at the Bank of Sierra Leone in Freetown, the capital, today.

Sierra Leone was West Africa’s second-biggest diamond producer after Guinea in 2009, according to the most recent data available from the Kimberley Process Certification Scheme that was set up to stop the trade in so-called “conflict diamonds” from countries including Sierra Leone.

Gold output declined 18 percent to 440 ounces, the bank said. Production of rutile declined to 5,030 metric tons in April from 5,060 in March while ilmenite output dropped 10 percent to 910 tons. Rutile and ilmenite are titanium-bearing minerals. Output of bauxite, an ore used in aluminum, rose to 141,640 tons in April from 140,640 a month earlier.