Wai Wai collaborates with Brazillian-born and Central Saint Martins graduate Betina de Luca to bring this black bangle to your vacation wardrobe. It’s crafted from matte acrylic and cut to a chunky rounded silhouette punctuated by gold-tone metal triangular studs that add an artisanal slant. Wear it to toughen up a patterned dress for sun-kissed days by the beach.