This "old world style" is a real old beauty of a necklace by Hattie Carnegie.
Lucite, acrylic, crystal, plastic, metal, glass & what might be brown natural stone with black veins -all are in this spectacular necklace! 
This necklace has many dark hues like blacks, golds, browns, purples, green & blue which gives it a Victorian vibe, (i have used camera flash to better show details).
Measures 19.5 inches long.
Has some wear on the black faceted beads but id say its in very good condition looking at all the beading & clasp closure.
Please view all pictures for more details.
Thank you.