Sapphires are perfect for weddings because they symbolize fidelity and nobility. For Will, the stone is even more significant, since Kate now wears his late mother's sapphire and diamond engagement ring. A little blue sapphire in his band is an elegant, touching way to honor his mother, and express hope for the future with Kate.

18k white gold Headlight ring with blue sapphire,

Photo: Courtesy of the American Gem Trade Association