108 N. Marion St., Oak Park, Ill.After relocating her jewelry boutique last year from Chicago’s hip Bucktown to the Frank Lloyd Wright architectural haven Oak Park, designer Laura Kitsos feels right at home. Ensconced in the award-winning Marion Street district—a vibrant retail stretch paved with heated bluestone sidewalks—the 7-year-old Gem sells a decidedly eclectic mix: sophisticated Kitsos originals, handmade pieces by independent designers from the United States and abroad, and industrial-chic home decor that’s cleverly merchandised to fill the loft-like 1,700-square-foot space.Urban OutfitOak Park is one of the Windy City’s oldest suburbs, full of home-owning professionals. Inside Gem, however, there’s nary a nod to old-fashioned tastes, unless you count the vintage finds—antique hat-check coins, Victorian gaming discs—used in Kitsos’ own designs. Musician Nick Ki