“Princess Anne notably chose to wear both the necklace and earrings in her ravishing engagement picture in 1973 to Captain Mark Phillips, father of her children.

“In 2011, Princess Anne’s daughter Zara Tindall wore the very same earrings on her wedding day, combined with the stunning Greek Key Tiara, in a geometrical style, which had belonged to Prince Philip’s mother.”

However, the Festoon Necklace was nowhere to be seen on Autumn’s wedding day.

Instead, the bride accessorised with pearl earrings and a matching necklace, which Peter had sent to her at Windsor Castle the night before their nuptials.

Speaking of the tiara, experts at Court Jeweller stated: “Delicate, with just enough height and enough fullness to be visually pleasing, I think this one was an excellent choice for a bride marrying the grandson of a monarch.”