The Duchess of Cambridge is rarely seen without it and the piece is worth a staggering sum of money.
Experts at jewellers Joshua James explained: “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.”