At the Met Gala last week, the trouble-starting crowd was closely observing the activity of Cartier and Tiffany, which are currently competing for the mantle of finest fine jeweler in the land. Cartier outfitted a whole host of celebrities, including ambassadors Elle Fanning, Sofia Coppola, and Emma Chamberlain, while Tiffany had co-chair Jennifer Lopez, the second-most famous person in the building, wearing its pièce de résistance from a high-jewelry showing in Los Angeles the week before—75 carats of diamonds arranged into the shape of a bird, its wings stretching out across her clavicle. Framed by Lopez’s dazzling Schiaparelli dress, the necklace was undoubtedly the most talked-about piece of the evening—except, maybe, for Mike Faist’s beaded turnip brooch.