Kate has worn the Cambridge Lover’s Knot tiara to important events, such as at state dinners, over the years.
The item comes with a huge price tag and could sell for as much as £19million at auction, an expert revealed.
Eddie Le Vian, Le Vian CEO, told Express.co.uk: “The Lover’s Knot Tiara has 19 diamond arches with 19 hanging pearls, all set in silver and gold.
“I estimate from having seen photographs of this tiara that it is made up of 85 carats of diamonds, the largest of which are three carats each, while the 19 pearls appear to be natural.
“I would value this tiara at approximately $ 3million and at auction, well in excess of $ 25million.”