On four decades’ worth of golden yearsWhen you think of gold, you think of Italy. And when you think of Italian gold, you think of Roberto Coin, who has built not only his business but also his reputation on working in 18k. The best thing about designing with gold, says Coin, is “the awareness that you are working with a natural precious material and you have to find a way to give it a soul and to express with it a message.” During market week in Las Vegas, he’ll debut “a huge amount of new creations,” he promises, “mostly focused on total gold collections like Florentine and Moi Pois and limited edition or Unique Pieces collections.” All will undoubtedly contain the Coin signature—a single ruby hidden somewhere within. Explains the designer: “I thought it was the most romantic way to wish the best to all people wearing my pieces.”Roberto Coin’s limited-edition Si