This is an authentic TIFFANY 18K Yellow Gold Platinum Diamond .43ct Solitaire Engagement Ring 49 5. The ring is crafted of 18 karat yellow gold and features a platinum six-prong setting holding a round brilliant diamond weighing approximately .43 carats, with G color and VS1 clarity. Follow this item for alerts. Tiffany is a registered trademark of Tiffany. FASHIONPHILE is not affiliated with Tiffany.