Year: 1990 This is an authentic TIFFANY 18K Yellow Gold Diamond Signature X Ring 52 6. The ring is crafted of 18 karat yellow gold and features a diamond X motif weighing approximately .15 total carat weight. This is a classic ring with the signature style of Tiffany! Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.