Chopard’s opulent necklace in 18-karat white gold and titanium—the latter metal keeps the necklace lightweight and more comfortable to wear—features pear-shaped emeralds totaling 105 carats, 73.2 carats of brilliant-cut Paraiba tourmalines and 52.3 carats of brilliant-cut diamonds. Price upon request, 212.223.2304, chopard.com