Brooch sales should skyrocket among anyone who paid attention to Monday’s Met Gala red carpet — without a doubt the night’s key accessory, brooches adorned every jacket lapel and closed the collar of many a button-down shirt. Other stars got a little more creative, like Lewis Hamilton, who affixed a Briony Raymond brooch to his beret, or Zendaya, who went rogue and placed a Bulgari Serpenti brooch on the back of her Louis Vuitton suit jacket.

Jewelers should be thrilled in general with their presence on the 2025 Met Gala carpet, as they played perfectly into the night’s key dressing theme of dandyism, embraced with equal verve by men and women. This year’s Met Gala is raising funds for the Metropolitan Museum’s Costume Institute while also celebrating Saturday’s opening of its latest exhibition, “Superfine: Tailoring Black Style.” This focus on showcasing Black identity via the dandies...