Previously Published to The Mad Marketer Earlier this month, Signet Jewelers acknowledged that omni-channel marketing was a major factor in increased sales for 2016 – and especially for end of year holiday shopping. In fact, they claim that it has, according to The Wall Street Journal, “Amazon-proofed” their endeavors. In the eight weeks leading up to Christmas, this Bermuda-based diamond retailer grew its sales by 5 percent in comparison to previous years. This year, Signet Jewelers has racked in $1.95B, a sharp increase for any business of this caliber. Signet is also known as the umbrella operation for subsidiary group, Sterling, which includes Kay Jewelers, Jared the Galleria of Jewelry,…