For green-minded and budget savvy consumers, we're proud to offer you eco-friendly Chatham-created gems. Choose from a variety of lab-grown gemstones including rubies, sapphires, emeralds, alexandrites and more. Chatham-created gemstones are real. Chatham simply creates the environment in which gems can grow naturally. Chatham gemstones are cultured just as many pearls; natural components are placed in an environment created to duplicate nature's.