Good Diamonds Are Hard to Find at World’s Richest Gem Mine – by Thomas Biesheuvel (Bloomberg News – February 7, 2019)

The Letseng diamond mine in Lesotho is renowned for unearthing some of the world’s most valuable gems, but it didn’t find many last quarter.

The average price of diamonds found was just $1,259 per carat in the fourth quarter, almost half the value for the full year, according to Gem Diamonds Ltd., which runs the mine. While that’s still the highest in the industry, it shows that the mine had a significant drop in finding the most precious stones.

Producing diamonds that are profitable to mine is a problem throughout the industry. Prices for the smallest and cheapest gems are falling because of too much supply and that’s shrinking profits for mining companies.

At the same time, several producers from Petra Diamonds Ltd. to Mountain Province Diamonds Inc. are finding stones worth less than they expected.

Gem shares slid 2.8 percent to 105.50 pence in London trading after the results.

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