As of now, which two groups supply more than half of the world's rough diamonds by value?

• A. ALROSA and De Beers
• B. ALROSA and Rio Tinto
• C. De Beers and Rio Tinto
• D. ALROSA and BHP

Answer: (A)

Two groups supply more than half of the world's rough diamonds by value are ALROSA and De Beers. ALROSA, the Russian producer, has long been the top force in rough-diamond value due to its large-scale mining operations and steady output. De Beers remains a major player with a global distribution and sales network that helps realize strong value from rough diamonds. Together, their combined production and market influence exceed 50% of the world’s rough-diamond value today. The other groups—Rio Tinto and BHP—do not operate at a scale comparable to these two in diamond production, with Rio Tinto having scaled back its diamond business and BHP not being a major diamond producer.