Rare Vintage Necklace by St. John

I'm not sure what type of metal or stones make up this necklace, but it is very unique and caught my eye at an estate sale. There are NO stones missing. The metal shows tarnish and makes it more charming, in my opinion. Created by St. John, so I know this statement necklace was made with quality materials. Please see pictures closely for irregularities. 12" drop Weighs approximately 7 ounces