Jewele rt iffany has named a former executiv eat Italian fashion compan yd iesel as its ne wc EO. Alessandro Bogliolo had been lur edt od iesel t or evitalize sales there. Tiffany’s been r unb y an interim CE Os ince Frederic Cumena ls tepped dow nin February. Cumenal hel dthet o pj ob for t woy ears and left amid concerns about the jewelry company’s financial performance. Bogliolo, 52 ,s pent 16 years at Bulgari SPA befor eta king the jo bat Diesel. Tiffany is hoping he’ll hel ptu r na round the company’s fortunes. It’s wrestled with wea ks ales as millennia lss pend money elsewher eandc ompetition intensifies from online playe rsl ike Amazon and Blue Nile.