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.
Brazil’s lower house of Congress removed from the agenda the discussion of a transitory presidential decree, which modified the country’s current mining law.
More than 130 potential buyers have already registered to participate in Wednesday’s online sale of the five-diamond collection, which includes the giant 51.4-carat Dynasty.
Decision comes in the wake of a full-scale investor revolt led by the Investor Forum, a London-based body representing some of the world’s biggest money managers.