Many people here have ideal cut rounds set in platinum. But usually their cut will help obscure the color somewhat due to the excellent light return. Many people have lower color OEC's in platinum, as well. In a radiant and some other fancy cuts, it's possible that there will be more tint showing just due to the way they are cut (especially the crushed ice kind). Do you see yellowish tint face up in the stone?
(Incidentally, questions about stones and settings go in Rocky Talky. This forum is to show off new jewelry pieces.)