Kate Middleton, 39, and Prince William, 38, tied the knot on April 29, 2011. The wedding took place at Westminster Abbey and was watched by millions of people.
At the ceremony, Kate was given a Welsh gold ring in line with royal traditions, experts at jewellers Joshua James explained.
They told Express.co.uk: “Kate’s simple gold wedding ring is crafted from a special nugget of Welsh gold – a tradition that dates back to 1923 – by Wartski, a jewellers based in London.
“The value of a Welsh gold ring depends on the weight and purity of the gold used, but will likely be upwards of £2,000.”
Others in the Royal Family have also been given similar rings and the one worn by Kate was originally from the Queen.
The experts claimed Queen Elizabeth II gave the jewel to Prince William ahead of their wedding day.
“The plain, slender band shows off the incredibly rare and beautiful gold that it was made from,” they added.
“It was free of decorative elements that embellish many modern wedding rings.
“The ring was gifted to Prince William by the Queen following the engagement.”
At the time, it reportedly cost Prince Charles £28,000 to purchase and the jewel was bought from the former Crown Jeweller.
Since the piece was given to Kate, it has soared in value which the experts suggested could have much to do with the sentimental value of the piece and its royal links.
“Created by Garrard & Co, the former Crown Jeweller, it is now valued at around £300,000,” they continued.
“However, much of its value is sentimental: this engagement ring was passed down from Princess Diana, Prince William’s mother.”
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.