A MID-19th century GOLD & GARNET-SET SERPENT NECKLACE with articulated tapered body, the head set

A MID-19th century GOLD & GARNET-SET SERPENT NECKLACE with articulated tapered body, the head set large oval foiled cabochon garnet & with garnet eyes, holding a pendant drop in its’ mouth set further cabochon garnet; 15¼” long, in original case (19.5g; hinge to case defective). (Small solder repair to underside of links entering serpent's head, visible in photo)