Tiffany & Co. Cushion Modified Brilliant Cut Diamond Pendant. Estate Tiffany & Co. platinum chain and pendant set with a center cushion modified brilliant cut diamond, surrounded by 18 round brilliant cut diamonds. The center diamond is of H color and VVS1 clarity and weighs 1.13cts. The surrounding diamonds are of F-G color and VS clarity and weigh a total of 0.16cttw