Tsavorite garnet and diamond snake necklace, Michele della Valle

The articulated serpent with hinged jaws decorated throughout with a pattern of round tsavorite garnets, round black diamonds weighing approximately 24.50 carats and round diamonds of yellow tint weighing approximately 7.25 carats, the eyes set with marquise-shaped cabochon rubies, mounted in 18 karat gold and silver, total length 35 inches, adjustable, maker's mark for Michele della Valle, numbered 10578.