Pretty in Pink (Gold)When the gold price started to skyrocket a few years ago, Mattioli didn’t launch a silver line or scrutinize gram weights; instead, the Italian gold vendor embraced a color that many others hadn’t: rose.Rose or pink gold, which gets its color from copper—the greater the quantity, the redder the gold—resurfaced in fine ­jewelry about 10 years ago thanks to its use in watches and its ability to complement ladylike couture. But to distinguish itself from other Italian manufacturers, Mattioli committed to making 90 percent of its line in rose gold. “It’s what really kept us going,” explains U.S. director Danny Bogue.With a background in watches—Bogue worked as a distributor in the late 1970s and has overseen distribution of Swiss-made Alfex timepieces since 2001—he knew some women would buy rose gold jewelry just to match their wristwatches. But those