Nature is an evergreen motif in jewelry design, but Martin Katz, one of Hollywood’s go-to red-carpet designers, isn’t fond of its creepiest, crawliest creatures. “Not everyone likes bugs,” he says of the recent industry trend of bejeweled insects. “They creep people out.” Starfish, however, “are very whimsical—not creepy at all. There’s something really wonderful about them.” Katz crafted this glittering diamond, pink sapphire, and pearl starfish brooch—which has a diamond- and ruby-covered twin—in the early 2000s in his Parisian workshop. Captured in mid-undulation, the starfish “seemed like a wonderful shape with great volume to work with,” says Katz. Both pieces were part of a larger collection, Bijoux de Mer, which also included seahorses, exotic fish, and octopus. “I love the water,” adds Katz, who spent the past summer zooming around on a private yac