Color HappyIf you’re wondering what kinds of bridal looks will be debuting during jewelry week in Las Vegas, prepare yourself for hue déjà vu. Manufacturers tell JCK that many of their new designs highlight color—in metal and in stones—a trend that’s been steadily mounting for more than a year.Jimmy Sengul, vice president of the Los Angeles– and New York City–based Demarco, says the diamond jewelry maker’s 2013 outlook was rosy—as in rose gold. “We’re mostly bringing micro-pavé styles that incorporate rose gold,” he says. And in the LUXURY exhibitor’s new Bubble coll