Kate and Sophie share a link with the pieces of jewellery they wear most often – their engagement rings.
Sophie, Countess of Wessex engagement ring
Sophie and Prince Edward announced their engagement in January 1999, after dating for around six years.
Royal fans got their first glimpse of the jewel in a royal photo call where the couple posed for official engagement photos.
The jewel features a two-carat oval diamond which is surrounded by two small heart-shaped gems.
The mother-of-two is rarely seen without the diamond and it is worth an estimated £110,000.
It was bought by Prince Edward at Garrad, which is a favourite jeweller of the royals.
Kate Middleton engagement ring
Kate and Prince William first met in 2001 and became engaged while on a trip to Kenya in 2010.
Like Sophie’s ring, the sapphire jewel was also bought from Garrad.
Experts at Joshua James Jewellery commented on the jewel, stating: “Kate’s engagement ring is incredibly famous, known for sparking a huge increase in sales of sapphire engagement rings back in 2010.
“It features a 12-carat oval sapphire set in 18k white gold, surrounded by 14 solitaire diamonds.
“Created by Garrard & Co. (the former Crown Jeweller), it is now valued at around £300,000.”
Never miss a royal update again by signing up to the Daily Express Royal Family newsletter
The royal line of succession – who outranks who?
The line of succession to the British throne dictates the order in which each member of the Royal Family would ascend to the throne.
It is also seen as a ranking of importance with the head of the line, the Queen, taking the place of ruler.
Older children come before younger children. Traditionally boys came before girls, but this law was changed on 26 March 2015 before the birth of Prince William’s first child.
Incredibly, Catholics are still excluded from the line of succession, as are children born outside of wedlock.
The royals, who usually stick to a strict protocol when appearing in public, often arrive at events in ascending order of importance, with the most important royal arriving last.
Prince Charles, 71, is currently first-in-line to the British throne, followed by Prince William, 38, his oldest son.
Then comes Prince William’s children, George, seven, Charlotte, five, and Louis, two, and they are followed by Prince Harry, 36. Prince Harry is succeeded by his son Archie Harrison, born in May 2019.