Amethyst Necklace, Double Strand about 24 1/2 inch

Vintage double strand handmade Amethyst necklace with other brown and tan stone beads that I believe may be Jasper. The necklace measures over 16 inches in length including the centerpiece. The strands themselves measure a little over 12 inches long doubled making it about 24 1/2 inches long. Very unique necklace.