Program aims to educate young consumers about mined stones’ positive qualities.
26.95-carat gemstone will carry $39,900 estimate at the November 13 Geneva sale.
6.95-carat stone to lead November 10 Geneva Jewels Auction: V.
42.68-carat sapphire will lead November sale in Geneva.
53.14-carat yellow diamond, set to fetch up to $3.5 million, was among items without a buyer.
Top seller was a 10-carat diamond ring that fetched $591,330.
Sale will also feature 280.84-carat Colombian emerald expected to fetch up to $2.6 million.
Ring sells for $1.1 million at Hong Kong auction.
Ring carries estimate of up to $1.3 million at Hong Kong Jewels sale.
Here are the rough and polished stones that made for a memorable year.
Ring featuring 20.19-carat stone sells for $13.2 million.