18K White and Yellow Gold Diamond Halo Ring. Certified Cushion Cut Center Diamond 1.05 Ct. Fancy Light Yellow Color and SI2 Clarity, GIA #6224457132. 0.16 Cttw Round Brilliant Cut Yellow Color, VS2 Clarity Average Diamonds 0.16 Cttw. and 0.24 Cttw. Round Brilliant Cut Diamonds with G Color and VS2 Clarity Average.