It could be "Florentine Art Cameo" an imitation cameo glass put out by Silber and Fleming in the late 1800's. I have an unmarked tumbler in the same color with the thin white lines at the top and bottom. There is some speculation in the latest Phoenix Glass book by Marple that it might actually have been made by Phoenix.
Or it could be real cameo glass - it's hard to tell from a photo.