Rose you haven't been back to revisit your topic so before it slides down the list I figured I'd post that I'm 99% certain this piece is Tiffin Empress Twilight & Smoke #6612 vase. It was bugging me that I knew what this form was, but until you took those last pics in the natural light it eluded me. This is glass on glass as far as the colors go, the Twilight is first then the layer of Smoke is attached. I'm certain I can see the seam on your first pics when I enlarge them. With this color combo the Twilight is washed out when the Smoke layer is applied because the Smoke layer turns very dark, almost black & this absorbs the light making the piece appear to be a smoky gray unless its held up tio natural light so you can see the color separation. Same thing exists on the Twilight & Green color combo only with that combo Tiffin realized the problem & discontinued it fairly soon after its introduction in 1967. The base is a match also. This is a fairly scarce Empress form in a very nice color combo, a very good piece of Tiffin Modern. I've attached a pic of two Empress Twilight & Smoke pieces I've owned, pics were taken in bright sunlight to show the color separation otherwise they would appear to be the smoky grayish coloration. Good thing your retook your pics in the natural light as it made all the difference in the world. Ken