Program aims to educate young consumers about mined stones’ positive qualities.
Unmounted stone beats $6 million top estimate in New York.
Selection includes a sapphire and diamond necklace carrying a $3.5 million upper estimate.
10.57-carat stone carries estimate of $35 million.
Piece brings in $82,550, well below its $350,000 low estimate.
Yellow diamond falls short of estimate with final price of $12.4 million.