The study valued her jewel at £390,000, more than double the price of Meghan’s, which was valued at £134,500.

The Duchess of Cambridge was given the sapphire and diamond engagement ring which once belonged to Princess Diana.

It had an oval cut and a 12-carat oval blue sapphire.

Meghan sports a diamond jewel which was designed by her husband Prince Harry.

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The five-carat cushion cut ring includes diamonds which have special significance to the Sussexes.

While both their engagement rings look different, experts in the study explained they have some similarities.

They said: “Looking at the Royal Family and their stunning engagement rings it is hard to make comparisons in such elegance.

“But looking purely at their characteristics there are some interesting similarities.”

“Meghan’s engagement ring boasts a trilogy of stones, a stunning central diamond ethically sourced from Botswana, where the couple previously vacationed together.

“The beautiful stone is surrounded by two smaller diamonds, from Princess Diana’s collection, tying her into her younger son’s engagement too.”

Kate’s ring from Princess Diana was designed by the luxury jewellery designer Garrad.

It was reportedly purchased for £28,000 but has soared in value over the years.

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, 72, 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.