Program aims to educate young consumers about mined stones’ positive qualities.
Group includes the largest collection of René Boivin pieces ever to come to auction.
Necklace features largest “top-quality” stone of its kind in auction history, company claims.
Selection includes a sapphire and diamond necklace carrying a $3.5 million upper estimate.
Several big-ticket items did not appear in results.
10.57-carat stone carries estimate of $35 million.
Stone was estimated to fetch up to $15 million in Geneva.
55ct. D-Flawless Diamond on the Sotheby’s Block