Blue Necklaces include materials such as Azurite, Chrysocolia, Chalcedony, Blue Calcite, South African Kynite, Blue Aventurine, Lapis Lazuli, Blue Agate, Dumortierite, Namiban Sodalite, Tanzanite, Iolite, dyed freshwater pearls, Swarovski and Czech crystal, copper, Bali, Thai Hill Tribe and sterling silver.