Aroma-Zone is mixing it up in more ways than one. The family-owned French beauty label, which started online with DIY natural products in 2000, just inaugurated a colorful 5,555-square-foot, three-story flagship in Paris that includes its first spa. Personalization is the name of the game in all respects. The retail space, about 3,330 square feet, is chockablock with 1,500 products, including neutral product bases, essential oils and empty containers. At the spa, clients answer a few question regarding their needs, likes and dislikes prior to a treatment. Responses are entered into a diagnostic application, which generates a tailor-made skin-care formula that is concocted fresh on the premises. Even the lighting, scent and sound in each of the three treatment rooms can be modified according to taste. Prices range from 39 euros, or $53 at current exchange, for a 30-minute foot treatment, to 69 euros, or $94, for a 50-minute facial, and 75 euros, or $103, for an hour-long body treatment.