They said: “Kate’s eternity band comes from London-based designer Annoushka, and is valued at £1,200.”

The Duchess most often wears all three rings on her wedding finger.

The order in which she does this could follow tradition and have a sweet meaning.

“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 experts explained.