Kate Middleton's engagement ring from Princess Diana now valued at 300k pounds

Kate Middleton's blue sapphire engagement ring, which originally belonged to Princess Diana, is now valued at 300,000 pounds – a tenfold increase to the valuation of the jewellery.

Vashi Dominguez, jewellery expert said on ITV's This Morning that it was Duchess' quiet confidence to lead as a style icon that made the ring featuring 14 diamonds around a 12-carat sapphire so special, Daily Express reported.

The blue sapphire was worth 28,000 pounds when bought in 1981. The ring has topped the world's top 20 most famous engagement rings followed by Duchess of Cornwall's an Art Deco design worth 100,000 pounds, and Michelle Obama's ring given by Barack Obama in 1991.