COMING AND GOINGS>> ?Bud Bergren, 65, will retire as president and CEO of Bon-Ton Stores. Bergren will stay on until a new CEO has been hired for the 276-store chain.>>? Platinum Guild International promoted Kevin Reilly to director of business development. Prior to PGI, Reilly served as vice president of sales and marketing at Tache USA and as director of new business development at Lazare Kaplan. Barbara Ryan>> ?Stuller named Barbara Ryan its vice president of ­jewelry. A 20-year industry veteran, Ryan served in numerous roles at Helz­berg Diamonds, including vice president of merchandise planning and technology.>>? Zale Corp. named Subha Ramesh senior vice president of real estate. Ramesh comes from Hilco Real Estate, where she served as a senior vice president. Rebecca Smith>>? Plouton Consulting named Rebecca Smith an associate partner. Smith worked