On Tuesday afternoon, French jeweler Mauboussin feted its newly opened Madison Avenue flagship with a lunch at Christie’s hosted by Nathalie Kaplan. Jennifer Creel, Debbie Bancroft, Eva Jeanbart-Lorenzotti and Adrienne Vittadini nibbled on salad and ogled the titanic cocktail rings that were passed around the tables. When the clock struck 2, the ladies fled to pick up their kids from school and plan their wardrobe for their next social obligation. But Adrienne Vittadini was free to lounge. “I don’t have work to go back to,” she said as she ordered a glass of white wine.