Nail salons across the country are putting a luxury shine on the typical no-frills manicure—and the women (and some men) of the style set can’t resist. Appointments are booked up two weeks in advance at New York’s Paintbox, where the sleek lacquered stations and a seasonal edit of designs reflect the hip SoHo location. British brand Nails Inc. recently unveiled its first stateside salon, inside Saks Fifth Avenue’s midtown Manhattan flagship. Options range from a simple polish change to a Swarovski-crystalembellished look. Olive & June, on an airy Beverly Hills block, has a Scandinavian feel and stocks cult-favorite brands like Treat Collection and Odacité. Miami’s understated Gloss Nail Bar specializes in eco-friendly products, including its own all-natural polish line.