DVF’S NEW MANTRA: A little slush wasn’t enough to keep Diane von Furstenberg and H.Stern chief executive officer Ronaldo Stern away from lunch at The Modern on Wednesday to celebrate their latest collaboration. While this is the sixth year the designer has worked with Stern, the partnership was a long time coming: “I approached his father, Hans, 25 years ago, and he refused me, so I had to wait for his son to grow up,” said von Furstenberg, who went on to profess her lifelong love affair with baubles. Her newest H.Stern collection, named Sutras, is inspired by 18th-century Indian mogul jewelry she collected until recently when auction prices rose. Donning an antique mogul ring on one hand and a new design — a rock-crystal and 18-karat yellow gold teardrop ring — on the other, von Furstenberg explained how she borrowed the ancient technique to create the lineup, which will retail from $3,200 to $19,400 and hit stores in April. Von Furstenberg made sure to have her favorite “sutras” engraved on the back of the pieces, such as Love, Laughter, Freedom and Truth.