Queen Mary of Denmark makes her debut in one of Queen Margrethe’s most treasured pieces of jewellery at a royal New Year’s celebration

Queen Mary of Denmark has been celebrating the New Year with a swathe of traditional engagements, joining her husband King Frederik on three glittering galas this week. On Tuesday, at the third of the events, she made her debut in one of her mother-in-law Queen Margrethe’s most…