Program aims to educate young consumers about mined stones’ positive qualities.
London Jewels auction will also feature several single-owner collections.
Signed jewels and period pieces dominate London auction.
Top item at October 6 Magnificent Jewels sale expected to bring in up to $5.1 million.
11.28-carat, radiant-cut stone will be offered in stand-alone auction in Hong Kong on October 5.
Revenue up 20% from last sale in December 2022.
Eternal Pink diamond sells for same price at high-value Sotheby’s auction.
Necklace estimated to sell for up to $500,000.
Ring from Heidi Horten collection garners $14.6 million.
55ct. D-Flawless Diamond on the Sotheby’s Block