It is thought this is an eternity ring gifted by Prince William when their first child, Prince George, six, was born.
They said: “The third ring she wears is an eternity ring. Eternity rings are often used to mark special milestones in a relationship – in this case, it was a gift from her husband to mark the birth of their first child, Prince George.
“Made from 18ct white gold, it features 0.23ct of white diamonds. Kate’s eternity band comes from London-based designer Annoushka, and is valued at £1,200.”
Why does Kate wear three rings on her wedding finger?
The royal was reportedly given all of the rings by Prince William and they all have great significance.