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.

Kate Middleton debuted a five-ring stack this September. The Princess of Wales is wearing Princess Diana’s sapphire engagement ring, which has set trends for decades, along with her Welsh gold wedding ...

In addition to the iconic sapphire ring, Princess Catherine wore three additional rings stacked neatly beside her wedding band. These elegant rings aren’t just pretty, they’re packed with sentiment.