Yes you should remember something like your own wedding ring... BUT remember that Phillip died because of Katherine, and her madness over his relations with Jill... I think Jill was the maid at that time. Not sure. It has a lot to do with guilt, scary when this stuff all comes to the surface when the grim ripper is knocking at your front door, isn't it?
Quote heart and soul: Kathrine dreamed of a ring and she could not find it in her jewerly box. She suddenly remembered a picture of her and a man, when she looked she had that ring on her finger. What does this mean?
I think maybe Jill knows something about the ring!!!