A manhunt for a threesome of armed robbers stretched into its second day on Monday after they brazenly held up a jewelry store in the middle of New York City's Diamond District and made off with high-end watches, gold rings, necklaces and other sparkly ornaments, but left behind shelves lined with bottles of champagne, police said. br The brazen heist at Avianne & Co. Jewelers unfolded midday Sunday, and sources told ABC New York station WABC-TV that the heist appeared to net the thieves an estimated $4 million in loot.