Cartier Diamond Pendant Watch with Pink Tourmaline Top. A beautiful marriage was made between this truly magnifique, 1920s Cartier diamond pendant watch and a very complimentary and colorful Edwardian watch pin. The watch itself is, in a word, 'amazing'! About 600 bright-white and sparkling rose-cut diamonds are tightly and concentrically set for a mesmerizing effect. The watch pin features a bright bubblegum pink tourmaline.