Program aims to educate young consumers about mined stones’ positive qualities.
Lot sells for $541,800 in New York, within estimates.
Piece is likely to fetch up to $800,000 in New York.
Piece sells for $793,300 against a $614,900 price tag in Geneva.
Ring has an upper estimate of $600,000 at May 11 sale.
Piece sells for $691,522 at Hong Kong Jewels auction.
9-carat gemstone will carry $833,000 high estimate at the March 30 sale.
New York auction totals $5.3 million, with 94% of lots selling.
Piece will lead December 8 sale, where it has a high estimate of $500,000.
Emerald pendant, ring and earrings fall short of reserve prices.
The Vanderbilt sapphire more than doubles its high estimate at $3.6 million.