Kate Middleton's engagement ring features a blue sapphire stone surrounded by 14 round-cut solitaire diamonds. It's set in 18-carats of white gold. The ring originally belonged to Princess Diana.

Princess Diana left her extensive jewelry collection to her sons to give to their future wives. Catherine, Princess of Wales, notably received Diana’s sapphire engagement ring when Prince William ...

She now has a five-ring stack all paying homage to royal history. Kate Middleton's engagement ring features a blue sapphire stone surrounded by 14 round-cut solitaire diamonds. It's set in 18-carats ...