The ring is estimated to make between $3 to $5 million, although the number could far exceed expectations.

In years past, Kate Middleton’s famous sapphire and diamond engagement ... band—a tradition among royal women—as well as a diamond eternity ring no doubt given to her by William.

They also happen to be ideal for wearing for a lifetime thanks to their durability – they’re second only to diamonds in hardiness. Below, we’ve curated the best sapphire engagement rings to ...

Princess Diana’s iconic sapphire and diamond engagement ring now belongs to Prince William's wife Kate Middleton Ariana Quihuiz is a contributing writer at PEOPLE. She has been working at PEOPLE ...

4. Blue Nile Three Row Stacked Pink Sapphire Baguette And Pave Diamond Ring In 14k Rose Gold Blue Nile Three Row Stacked Pink Sapphire Baguette And Pave Diamond Ring In 14k Rose Gold Save 40% on ...

Tim Graham//Getty Images Lady Diana Spencer (later Princess of Wales) reveals her sapphire and diamond engagement ring with Prince Charles, Prince of Wales following the announcement of their ...