This is an authentic TIFFANY Platinum Diamond 1.58ct True Engagement Ring 51 5.75. The ring is crafted of platinum and features a round brilliant cut diamond, approximately 1.58 carat with F color and VS1 clarity, along with approximately .29 total carat weight of additional diamonds along the setting and the top half of the band. PLEASE NOTE: The center diamond of this ring is a Tiffany heritage stone from another design which was reset into the current setting by Tiffany.