5.90 Carat Fancy Yellow Diamond Engagement Ring in Platinum 18k.  This modern engagement ring features a stunning GIA certified 5.90 carat fancy yellow radiant cut diamond set in 18 karat yellow gold and platinum. The gorgeous fancy yellow diamond is prong set in yellow gold and wreathed in a halo of smaller white round brilliant cut diamonds. This immediately treats the eyes to some beautiful contrast between the natural yellows of the diamond and gold with the halo and platinum. This is a stunning ring that is sure to draw eyes everywhere it goes!