Program aims to educate young consumers about mined stones’ positive qualities.
Piece brings in $82,550, well below its $350,000 low estimate.
Signed jewels and white diamonds are some of the safer bets for collectors, insiders say.
Both categories saw highest or near-highest results in over five years at London event.
Emeralds were top sellers, as were pink and yellow diamonds.
Here are the 10 top-grossing stones at auction in 2022.
Here are the 10 largest rough and polished stones to hit our news feed this year.
Attallah cross by jeweler Garrard adorned the royal at several public events.
Pre-owned timepieces are beating jewelry at auction and outselling hard-to-get newer models.
Sale price hits just above lower end of estimate.
6.25-carat gemstone salvaged from fabled Nuestra Señora de Atocha shipwreck of 1622.