If you like your beauty products to serve multiple functions, make sure you check out the new Noir G de Guerlain mascara by Guerlain. The true-black mascara is formulated to offer you a dramatic look, with maximum volume, length, and curl. In addition, the wand applicator is refillable, so you can switch to a new wand with ease. Finally, the jewel case—which is pretty in its own right—doubles as a compact; you can pull on the case and with one quick click you will find a hidden mirror. In other words, this product is a must for the girl-on-the-go—it is as handy as it is high-end. The Noir G de Guerlain mascara will launch in January at Saks Fifth Avenue, Nordstrom, and Bloomingdale’s. It will retail for $49; refills will retail for $26.