Black Agate is said to be used for protection, courage and success. It is also said to help the reproductive system. Many use the stone due to their said ability to help ease some nausea and indigestion. Details - The necklace is 42 cm with a 7 cm extender - This is a real semi precious stone and can therefore vary in shape and clarity - Brass based; 18k gold plated - Made by Happy People - Free from nickel, cadmium and lead