Signet Jewelers, a retailer of diamond jewelry, agreed to acquire Blue Nile, an online retailer of engagement rings and fine jewelry, for $360m. "Blue Nile is a pioneer and innovator in online engagement rings and fine jewelry, providing a unique and highly desirable shopping experience for customers. Adding Blue Nile to our strong and diversified portfolio of banners will further drive our Inspiring Brilliance growth strategy - expanding customer choice, building new capabilities, and achieving meaningful operating synergies that will increase value for both our consumers and shareholders," Virginia C. Drosos, Signet CEO.