This peculiar technique is produced with the inclusion of neodymium oxide into the molten glass. In this way, the Murano glass artwork will change color with different lighting conditions: lavender appears with natural, yellowish or warm white artificial light. Blue under fluorescent or cold white light.
The name comes from the gemstone alexandrite, a variety of chrysoberyl , that has similar colors and properties. Alessandrite was invented to imitate it.