Program aims to educate young consumers about mined stones’ positive qualities.
Sapphire and diamond ring is top seller, surpassing its high estimate.
Emerald-cut, 8.02-carat diamond is top seller, at $215,900.
Jewel featuring sapphires and diamonds sells for $507,000.
Auction also sees strong demand for collections from Hollywood legends Mary Tyler Moore, Barbara Sinatra and Tony Randall.
Top items fetched more than three times their high estimates.
Environmental charity notes improvement — but believes the industry has a way to go.
Unmounted stone has a high presale estimate of $5 million.
London Jewels auction will also feature several single-owner collections.
Fancy-intense-orangy-pink stone will lead December 5 John Moran sale.