Platinum, 18ct gold and diamond 'Signature X' pendant necklace, Jean Schlumberger for Tiffany & Co., modelled as a cross decorated with a continuous line of pairs of brilliant-cut diamonds alternating between wire work X-shaped motifs, the diamonds together weighing approximately 0.30 carat, completed by a fine trace chain, pendant length approximately 25 mm, chain circumference approximately 412 mm, signed T & Co. For Tiffany & Co., Schlumberger.