Program aims to educate young consumers about mined stones’ positive qualities.
Auction house will not sell last 300 pieces due to backlash over collection owner’s Nazi ties.
Christie’s garners $202.2 million from three-part auction.
Ring from Heidi Horten collection garners $14.6 million.
Collector Heidi Horten’s husband made his fortune during Third Reich.
Despite a poor showing at the fall sales, large colored diamonds and historical jewels look like they will gain steam this spring.
Late Austrian billionaire’s jewelry assortment set to be most valuable in auction history.