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

Of the enduring popularity of blue royal engagement rings, Max adds: "It's clear royal family are huge fans of sapphires, a stone which is traditionally believed to attract abundance and blessings.

Royal women have often favored sapphires, especially when it comes to engagement rings: Princess Anne sports a blue sapphire engagement ring, and Princess Eugenie wears a rare blush-colored ...