The ring that William gave to his fiancée is a blue sapphire. What does a gem specialist say about the choice of this precious stone and the energy that accompanies the jewel? Astrology describes that the half-return of Uranus in Middleton's birth chart could give signs about what she is prioritizing in her time out of the public eye; but this is not the only theory that emerged.

The jewel attracted so much attention worldwide that replicas of the ring were being manufactured in Yiwu, a town in Zhejiang province, China.