To Redeem a Landau Gift Certificate, enter the code at the bottom of your gift certificate into the Promo Code Box at checkout. Reminder: Gift Certificates may not be used on Sale/Promotional items.(Promotional items include Diamondess, Egg Pendants, Pave Initials, $29 Pins, $19 Pins, Semi-Precious Jewelry, $19 Scroll Stackable Bracelets, and Eternity Rings.)