Gucci, the purveyor of ultra-high-end handbags, sunglasses and other accessories, reported some not-so-glamorous earnings results on Thursday. Kering, the Paris-based fashion conglomerate, said that Gucci sales dipped 1.6 percent in the third quarter, even as other luxury brands in its stable saw healthy growth. Yves Saint Laurent, for example, saw sales soar 27.6 percent, while sales at Bottega Veneta rose 10.4 percent.