32mm Long x 20mm Wide 20" SN015 Snake Chain. STUNNING Chain Boxed MOONSTONE IS KNOWN FOR  DRAWING DOWN THE MOON The Triple Moon Symbolises the Triple Goddess:  The Maiden, Mother and Crone. This is Represented Through the Waxing, Full and Waning Phases of the Moon. Your item is 100% Sterling silver and may tarnish as all silver does. It is well known silver reacts with the elements this may be caused by  highly acidic perspiration or contact with other chemical agents  like perfume, makeup, hair