Kate Middleton doesn't always wear the sapphire and diamond engagement ring that was once worn by her late mother-in-law Princess Diana, and there is a standout reason why.

Audrey Hepburn takes a break from filming Breakfast at Tiffany's — still wearing a multi-string pearl and diamond necklace.

The affordable line features the designer's famous Elisa Gold Pendant Necklace in Peridot Illusion that has been flying off ...