14k gold 6mm single add-a-pearl starter necklace. This starter necklace is designed to begin a 6mm add-a-pearl necklace. One of our most popular programs, add-a-pearl necklaces start as a single pearl necklace, often gifted at a childs birth, and then grow with her over the years as pearls are added one at a time. We sell single 6mm pearl cards for $20 and those pearls can be added to the necklace for free, one inch at a time. For more information, please visit us or call.