18ct gold, platinum and diamond 'Circle' pendant, Jean Schlumberger for Tiffany & Co., the half round open work circular plaque is decorated with a line of brilliant-cut diamonds alternating bet ween applied X-shaped motifs, the diamonds together weighing approximately 0.64 carat, completed by a fine trace chain, pendant approximately 20 mm, circumference approximately 400 mm, signed T & Co for Tiffany & Co., Schlumberger Std, accompanied by a Tiffany & Co. Box.