This is an authentic TIFFANY 18K Yellow Gold Diamond Micro Oval Signet Ring size 50 or 5.25. The ring is crafted of 18 karat yellow gold in the shape of a signature signet oval motif, set with a single round brilliant cut diamond, approximately .01 carat. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.