Mark Emanuel is the co-owner and creative director of the venerable David Webb, and Ruth Peltason is a jewelry historian and specialist who has written one of the best books on jewelry in many years. The Art of David Webb: Jewelry and Culture, just published by Rizzoli, has received across-the-board acclaim from those who would know. It’s an unusual coup for an illustrated book, but then this one is special. Come to the 92nd Street Y—now going by the name 92NY—to hear Emanuel and Peltason discuss David Webb and how this illuminating book, which explains the art of his work, came to be. The time is 7:30 P.M. E.T. —Laura Jacobs