Jewel was from the collection of Queen Nazli, former queen mother of Egypt.
Decision follows “disruptive” impact of synthetic diamonds on market, organization says.
Auction at Cornette de Saint Cyr will feature pieces from Cartier, Van Cleef & Arpels, Boucheron, and Chaumet.
Auction garners $16.1 million in total, with Patek Philippe and Cartier timepieces fetching the highest amounts for their specific models.
Stuart Brown was also the CEO of Mountain Province and Firestone.
Dubai-based diamond sourcing and supply company will take over responsibility for environmental rehabilitation fees.
Plain gold and studded items saw double-digit rises.
All items on offer found buyers, with 60% fetching above high estimates.
Unmounted stone was top seller, raking in $5.8 million.
Craig Miller of JC Jewels gives the lowdown on Australia’s jewelry market
Why Brilliant Earth Has Been Outpacing Signet