Program aims to educate young consumers about mined stones’ positive qualities.
Piece featuring 5.69-carat sapphire fetches $462,900 in Paris.
Patek Philippe red-dot timepiece sails past high estimate to fetch $2.8 million in New York.
Jewel has a $347,000 upper price tag at Joaillerie Paris sale.
49.91-carat diamond ring fetches $2 million, beating its $700,000 high price.
Fancy-orange-brown diamond pendant more than doubles high estimate to fetch $474,400.
Jewel sells for $194,500 at Hong Kong online auction.
Patek Philippe timepiece leads sale, fetching $1.8 million.
Piece is highest-priced item at Magnificent Jewels sale in Hong Kong.
Jewel featuring diamonds likely to fetch up to $350,800.
Piece has a $1.8 million high estimate at the Magnificent Jewels sale.