Duchess of Cambridge and her engagement ring that was formerly her late Mother-in-law's, Princess Diana.

Prince William praises Kate and cheekily mocks Harry at charity launch

Family heirloom: Prince William proposed to Kate with a beautiful 12 carat blue Ceylon sapphire ring that belonged to his mother, Princess Diana

The dazzling history of the world's most iconic engagement rings

Family heirloom: Prince William proposed to Kate with a beautiful 12 carat blue Ceylon sapphire ring that belonged to his mother, Princess Diana

PORTSMOUTH, ENGLAND - JULY 24: Catherine, Duchess of Cambridge's ring at the trophy presentation of the America's Cup World Series on July 24, 2016 in Portsmouth, England. (Photo by Mark Cuthbert/UK Press via Getty Images) via @AOL_Lifestyle Read more: http://www.aol.com/article/2016/07/25/kate-middleton-rocks-sporty-look-at-regatta/21438222/?a_dgi=aolshare_pinterest#fullscreen

Kate Middleton rocks sporty look at regatta

PORTSMOUTH, ENGLAND - JULY 24: Catherine, Duchess of Cambridge's ring at the trophy presentation of the America's Cup World Series on July 24, 2016 in Portsmouth, England. (Photo by Mark Cuthbert/UK Press via Getty Images) via @AOL_Lifestyle Read more: http://www.aol.com/article/2016/07/25/kate-middleton-rocks-sporty-look-at-regatta/21438222/?a_dgi=aolshare_pinterest#fullscreen

Royal Wedding Pictures: The Ones You Haven't Seen A Million Times | Details of Kate's engagement ring and flowers.

PHOTOS: The Royal Wedding Pics You Never Saw

Royal Wedding Pictures: The Ones You Haven't Seen A Million Times | Details of Kate's engagement ring and flowers.

The Sapphire Side Stone Love Kate Middleton’s ring but still want a diamond? Stick with some sapphire side stones for a pop of color. Engagement ring by Gabriel & Co.

30 Dream Engagement Rings

The Sapphire Side Stone Love Kate Middleton’s ring but still want a diamond? Stick with some sapphire side stones for a pop of color. Engagement ring by Gabriel & Co.

History of Welsh Gold. From Queen Victoria to Kate Middleton their wedding rings have been made from Welsh gold

History of Welsh Gold. From Queen Victoria to Kate Middleton their wedding rings have been made from Welsh gold

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