royal wedding. One gift they'll be receiving is the custom perfume set pictured above. The Roja Dove Haute Parfumerie of Harrods has commissioned perfumer Clive Christian to create a unique presentation of his and hers No. 1 Perfumes (a.k.a. the World's Most Expensive Perfume, at $5,500 for 1 oz. of pure perfume) for Kate and Will. The hand-cut crystal bottles, each etched in gold with the couple's initials and featuring a diamond in the collar, will be presented side by side in a black case hand-embroidered with the royal coat of arms.