Program aims to educate young consumers about mined stones’ positive qualities.
Expansion of store network and lab-grown line also contribute to fourth-quarter hike.
Revenue from synthetic diamonds up 83% year on year in fourth quarter.
Electronics, toys and apparel were top-selling categories, Adobe Analytics reports.
Figure beat NRF’s original prediction by more than 18 million.
Spending on category was 99% higher than average day in October, Adobe reports.
Mastercard also reports a strong overall performance for the category.
Revenue for November and December will rise 4.8% to $221.8 billion, predicts Adobe.
Promotions will be key theme this season, Mastercard SpendingPulse predicts.