Police are hunting for the man who stole $28 million worth of diamonds from a bank in Antwerp last week. The suspect, a tall, gray-haired man apparently in his late 50s, had been a trusted customer at the bank for at least a year. But it turned out that an Argentine passport he used to open his account, under the name Carlos Hector Flomenbaum, had been stolen in Israel several years ago. Last week, when the man was left alone in the safe-deposit box room, he broke into several boxes and pocketed 120,000 carats of diamonds. Antwerp is the center of the global diamond trade; half the worlds diamonds are traded there.