18ct gold, turquoise, enamel and diamond necklace, Jean Schlumberger for Tiffany & Co., comprising seven lines of 3.75 to 4.00 mm round turquoise beads highlighted at intervals with five barrel-shaped gold spacers applied with yellow paillonne enamel decorated with collet-set brilliant-cut diamonds, completed by a concealed clasp, inner circumference approximately 960 mm, signed Tiffany, Schlumberger.