This is an authentic TIFFANY 18K Yellow Gold Fancy Yellow Diamond 2.85ct Novo Cushion Cut Engagement Ring size 50 or 5.5. The ring is crafted of 18 karat yellow gold, and features a cushion modified brilliant cut Fancy Yellow colored diamond, approximately 2.85 carat with VS1 clarity, along with approximately .21 total carat weight of pave-set diamonds along the top half of the band.