This unique serotonin molecule necklace promotes happiness and well-being. Its design transforms serotonin's chemical structure into modern fine jewelry. Wear or gift this piece for a subtle reminder to be happy. Crafted from genuine solid 14 karat gold, it is not plated, filled, or over sterling silver. This necklace will not tarnish, contains no nickel, and is hypoallergenic, ideal for sensitive skin. The solid gold molecule measures 30 by 15 millimeters on an 18 inch rolo chain. It makes a perfect gift for mothers, grandmothers, daughters, wives, sisters, aunts, friends, or yourself. We offer quality assured products and the best service. Contact us with any requirements.