This is an authentic TIFFANY Platinum 18K Yellow Gold Diamond Fancy Yellow Diamond .20ct Soleste Cushion Cut Halo Pendant Necklace. This necklace is crafted of a platinum and features a cushion cut fancy yellow diamond weighing approximately .21 carat held by 18 karat yellow gold prongs. It also features a halo of round brilliant cut diamonds weighing approximately .10 total carat weight.