Bluemercury™ Apothecary and Spa, housed in a 19th-century brownstone near Rittenhouse Square, offers the ultimate spa for high-end beauty addicts. Extra special services include a deep cleansing power facial that treats the skin with vitamins, oxygen and microdermabrasion. Estheticians use the shop's own glycolic cleansers, calming masks, herbal toners and vitamin-enriched oxygen during facial treatments. Bluemercury™ carries such chic makeup and skin-care lines as Bliss, Nars and Darphin.