Jewellery experts at Angelic Diamond’s previously spoke to Express.co.uk about the most popular royal engagement rings.
They said: “Kate Middleton’s engagement ring, worth an incredible £400,000, is the most expensive engagement ring belonging to the Royal Family, as well as the most popular with the public amassing an incredible 9,120 searches a month.
“Kate’s engagement ring, formally owned by the late Princess Diana and inspired by a brooch that has been passed through the family, is a 12-carat oval sapphire surrounded by a halo of 14 solitaire diamonds.
“Sapphires are a favourite of the royals thanks to the belief that they protect from harm, negative energies, and bad spirits, as well as being an apparent antidote for poison.