Find CARTIER Panthère De 18ct White-gold, 1.15ct Brilliant-cut Diamond, Emerald And Onyx Ring 58mm on Editorialist. Cartier's legendary Creative Director, Jeanne Toussaint, took over from its founder in '33, but did you know she also went by another name? The Panther. Titled after Toussaint's pseudonym, the Panthère de Cartier ring is cast with 18-carat white gold to form a slinky imitation of the big cat's silhouette. Sprinkled with sparkling 1.15-carat brilliant-cut diamonds, it's a pai