Vintage 4 Strand "Glass" Necklace

Vintage glass 4 strand necklace is gorgeous! Minor surface scratches throughout and on closure, piece is heavy as it is 4 strands of what I believe to be glass, defiantly not plastic. Beautiful Earth tone colours, with multi sizing on drop length (see reverse photos) I don't know a lot about this necklace other than it was purchased by my grandma and found prior to her estate sale. Questions? Please ask prior to purchase.