Kate Middleton wears a rarely-seen pearl necklace from her personal collection at Windsor Castle

As is expected from the Princess of Wales, her choice of jewellery was full of poignant nods to her royal roots. Her Cabochon Sapphire Drop Earrings, for example, were beloved by Princess Diana, who wore them during a state visit to Canada in 1991 and later to the Met Gala in New York in 1996. Pinned to her lapel, meanwhile, was Queen Alexandra’s Three Feathers Brooch, a dazzling piece that dates back to 1863 and is traditionally worn by the wife of the Prince of Wales.

Underneath her…