Yehuda Diamond, which offers a comprehensive co-op advertising program for retail jewelers, announced that its 2003 consumer advertising campaign will be expanded to several national consumer magazines. The publications include Vogue, Harper’s Bazaar, InStyle, Robb Report, and Town & Country. The overall campaign includes local television commercials as well. For information, contact Yehuda Diamond, 580 Fifth Ave., New York, NY 10036; (800) 934-8328 or (212) 221-5985.