"I immediately thought of opals for Kate. It's a myth that wearing them is bad luck—in fact, Queen Victoria used to give them as wedding gifts, and they're considered a symbol of hope. I love that this particular opal is a deep blue, a color Kate loves.
"As for William, we know he's "not one for jewelry," so I've chosen a bejeweled pocket knife he can display as an objet d'art. It features sapphires, a significant stone for this couple, and is fittingly titled The Monarch Coral Sea." —Amy Elliott, Executive Editor
18k white gold ring with 43.05- carat spherical black opal accented with tsavorites, sapphires, paraiba tourmalines, and diamonds, Samuel Getz Designs, 202-966-9700; Hand-carved sterling silver knife with sapphire insets and 100,000-year-old fossilized brain coral, William Henry Studio