Kate Middleton, 39, joined the Royal Family in 2011 after she married Prince William, 38. She has a huge jewellery collection with stunning earrings, necklaces, bracelets and rings. She also has borrowed pieces from the Queen as well as having some pieces that belonged to Princess Diana before she died.

Princess Diana kept this set of jewellery for special occasions and wore it first in 1981 to the National Film Institute Dinner at the Royal Festival Hall.

The expert added: “Diana herself refashioned this jewellery and wore some of the sapphires from the suite as a headband to a dinner hosted by Emperor Hirohito in Japan in 1986. 

“In fact, it has become one of her many infamous fashion statement moments.”

The earrings are now one of Kate’s favourite pairs in her collection, and she also wears them on special occasions.

The expert added that it is impossible to put a value on the items without closer inspection but if she could put a numerical value on them, they could be worth a fortune.

The expert continued: “To hazard a guess I would estimate the value to be anywhere from £35,000 to £55,000 …..but having said that, if the items were ever to go into an auction, given their history they could reach a much higher value!

“Also, the unique history attached to these pieces heightens their value even further.  

“The hope is that they would never reach an auction house and they would remain in the family, being refashioned and remodelled for each new generation to wear and enjoy!”

Remodelling the earrings could also show Kate’s thrifty side as she regularly re-wears clothes and jewellery, showing she is passionate about sustainability. 

Charlotte added: “Remodelling jewellery is a fantastic way to enjoy sustainable luxury!”