Kate Middleton's had an on-again, off-again relationship with her engagement ring for a year. What's the royal secret about ...

Why Princess Diana's Awkward Engagement Announcement to Prince ... The now iconic ring features a 12-karat oval Ceylon sapphire set in 18-karat white gold and is surrounded by 14 solitaire diamonds.

The Princess of Wales isn't wearing her engagement ring as much anymore, but that doesn't mean she's not honoring Prince William another way.