Economic jitters and soaring gold prices create a frenzy for U.S. jewelry merchants

At the biggest jewelry center in the United States, Alberto Hernandez fired up his machine on a recent day and waited until it glowed bright orange inside before shoveling in an assortment of rings, earrings and necklaces weighing about as much as a bar of soap: just under 100 grams, or 3.2 troy ounces.