Program aims to educate young consumers about mined stones’ positive qualities.
Eternal Pink diamond sells for same price at high-value Sotheby’s auction.
Several big-ticket items did not appear in results.
10.57-carat stone carries estimate of $35 million.
Sotheby’s will offer eight-piece De Beers set at global Magnificent Jewels auctions.
Lot becomes second-most valuable jewel ever sold at auction.
Stone bears some similarities to famous Hope and Wittelsbach-Graff stones, says GIA.