Art Deco onyx bead, colored stone and diamond necklace, circa 1930

The front designed as three swags of onyx beads spaced by single-cut diamond rondelles, the sides decorated with round diamond-set links and pairs of black and red enameled cylinders studded with cabochon emeralds and sapphires, the back composed of two rows of smaller onyx beads and diamond rondelles, completed by a gem-set cylindrical clasp, mounted in platinum, length approximately 20 inches.