George Kaufmann, former co-owner of the Robert Bernard jewelry store at Potomac Woods Plaza, will soon be back in the jewelry biz. His new venture, Kaufmann Jewelers, is set to open in August on the ground floor of a condo building at Park Potomac — just around the corner from his former digs. Kaufmann, who closed Robert Bernard Jewelers last December after his business partner retired to California, says he wanted a fresh start as he brings son Corey into the business. “My own father, Herbert Kaufmann, had a store in D.C. from the 1940s on,” he says. “When I started doing business in Potomac in 2004, I still had customers coming in who had gotten their engagement rings and bar mitzvah rings from my father. He would have been very happy that I’m bringing back the name in this new business.”