The French crystal manufacturer Baccarat unveiled its new flagship boutique on Manhattan’s Madison Avenue in June. The stylized entryway, which features a diamond pattern cut into glass, opens to a 2,800-square-foot store with a jewelry bar, a lounge that showcases Baccarat’s home decor collection, and a dining room set with its new crystal stemware and barware. Among the store’s debut collections is the Lady Crinoline Comète three-tier chandelier ($44,850), which incorporates LEDs into a reinterpretation of t…