Vintage 9ct Gold Eternity Ring Please refer to the photos for detailed information on the various hallmarks. Makers mark of S&K. Stamped 375 (9ct) gold. Also stamped 'CZ' which I assume refers to Cubic Zirconia for the white stones. My best (uneducated) guess is that the five other stones are likely to be Pink Tourmaline. Measuring Inside Diameter: 16mm NZ Ring Size: K Weight: 1.33g Delivery by NZ POST Economy service within New Zealand. A tracking number will be provided.