I don't know who did the glass pieces or even if they are Murano. Maybe someone else can help with that. The color change may indicate that the glass is alexandrite (AKA alexandrit or neodymium). Alexandrite is lavender or pinkish in incandescent light and blue under flourescent light. I am not sure what would make it look green. Our interpretations of colors and the other chemicals in the glass may explain the differences. The vase looks like it could be alexandrite to me.