"Mm-hm," says Miss Eartha. "His contact's in there." She indicates one of the buildings, a broad, five-story affair with RUBIN DIAMOND EXCHANGE on the sign and two guys handing out brochures saying WE BUY GOLD AND SILVER out front. "There's a good couple hundred people working in there every day but the High Holy Days. Ari's the one who works with Ray the most."