Rene Lalique, a Davos Alexandrite glass vase, model 1079, designed circa 1932, polished, etched mark R Lalique France, 28.5cm high Note: dichroic Alexandrite glass was used by Lalique for a handful of vases; it changes colour according to different lighting conditions. The glass appears lilac or pink in natural sunlight or yellow artificial light, and blue/green in fluorescent/white light. The shades of lilac, pink and blue/green can vary greatly depending on the glass mixture.