They stated: “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.
“However, much of its value is sentimental: this engagement ring was passed down from Princess Diana, William’s mother.”
As well as wearing the family jewel, Kate has two other rings she will often wear on her wedding finger.
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When Kate and Prince William married, she was given a Welsh gold wedding band in line with royal tradition.
The ring was made from the material used to create rings for royals including the Queen, Sophie, Countess of Wessex and Meghan Markle.
Before it was Kate’s, the jewel was given to Prince William by the Queen.
“Kate’s simple gold wedding ring is crafted from a special nugget of Welsh gold (a tradition dating back to 1923) by Wartski, a jewellers based in London,” the experts added.
“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. The plain, slender band shows off the incredibly rare and beautiful gold it was made from, free of decorative elements that embellish many modern wedding rings.
“The ring was gifted to Prince William by the Queen following the engagement.”
Since they wed, Prince William and Kate have had three children together.
Following the birth of their first son, Prince George, seven, Kate added another ring to her collection.
The mother-of-three started to wear a white gold band believed to be an eternity ring gifted from Prince William.
The experts continued: “The third ring she wears is an eternity ring. Eternity rings are often used to mark special milestones in a relationship – in this case, it was a gift from her husband to mark the birth of their first child, Prince George. Made from 18ct white gold, it features 0.23ct of white diamonds. Kate’s eternity band comes from London-based designer Annoushka, and is valued at £1,200.
“In terms of why she wears three rings on one finger, many women choose to wear all three rings (wedding, engagement and eternity) on their wedding finger following marriage.
“The order in which these are worn actually has a great significance: wearing your wedding ring first means it is closest to your heart, followed by the engagement and then eternity ring. It looks like Kate Middleton follows this tradition.”