Program aims to educate young consumers about mined stones’ positive qualities.
Bidding was strong for 87 stones from company’s Argyle and Diavik mines.
Rio Tinto appoints Matthew Breen to succeed Angela Bigg.
Collection includes pinks, reds and yellows from Argyle and Diavik mines.
Piece carries price tag in excess of $1 million.
Extra year could add 2.2 million carats of rough production.
Ring featuring 3.42 carats of pink, red and blue diamonds from the mine priced at $3.8M.