The U.S. Treasury Department imposed sanctions on a Myanmar state-owned gems enterprise in a bid to curtail the military junta's ability to generate revenues.
The oval stone, set in a ring embellished with smaller diamonds, sold after a three-minute contest. It was estimated to sell for as much as $42 million.
Representatives of major mining companies believe the global copper market will be balanced for the foreseeable future even as mine supplies tighten and demand from China, the world's top consumer, remains strong.
“The one thing this industry does very well is mine gold at a loss,” Randgold Resources CEO Mark Bristow told analysts at a breakfast meeting on Friday.