What better time than summertime to promote the eco-conscious looks of uncommon and organic materials such as wood, fossilized coral, mother-of-pearl, horn, and bone? Less precious than conventional jewelry, these repurposed beauties make a cost-effective statement ideal for the warm-weather months. Despite the challenge of working with sometimes-fussy materials (wood can break if overpolished), jewelers persevere in the ­studio to obtain results that are unpretentious, ­fashion-forward, and, best of all, environmentally friendly, striking the perfect balance between fine and costume jewelry—naturally.1. Geometric Bangle with bird eye maple and sterling silver inlay; $2,200; Patricia von Musulin, New York City; 800-243-5596; pvmonline.com2. Terrain aragonite natural crystal cluster from Morocco with reclaimed cherry wood, moonstone, recycled and sterling silver; $790; Andrea Rosenfel