Southwestern style is surging in popularity among jewelry designers. What’s behind the enduring appeal of Native American iconography?A treasured collection of big silver belt buckles, turquoise cuffs, and vintage squash blossom necklaces from a youth spent in Texas inspired jeweler Jacquie Aiche to start buying arrowheads at roadside tents during the gem shows in Tucson, Ariz., 11 years ago. The Los Angeles–based designer, who is part Choctaw, says the pieces served as muses for her signature Deco Arrow studs in vermeil. Aiche continued to learn more about Native American symbols, even securing an education at the Esalen retreat in Big Sur, Calif., where she met a shaman who schooled her on the healing properties of spirit animals. All of these efforts will culminate this summer, when she debuts a Spirit Animal collection in 14k gold and, on request, silver. “I think it’s import