Tiffany & Co. Knife Edge Ring. Size: 15 Ring Width: Approximately 1.7mm Markings: TIFFANY&CO., 750 Weight: Approximately 1.8g Accessories: None The metal color is yellow gold. In addition to the above, there are personal date and initial engravings. There are fine scratches on the metal. This is a genuine item purchased from an authorized dealer in Japan. The case in the image is for another ring and is not included. Ring Size: 15 Material: Gold