Corning Glass Works has reproduced a blank of a material of similar chemical composition and internal structure, which displays under reflected and transmitted light the same "Lycurgus effect" of green to red colour change as the Lycurgus cup material does.Freestone, 273, fig 6 a & 6b Cranberry glass or gold ruby glass is somewhat similar and far more common, manufactured with colloidal gold, but this only ever shows a red colour.
