An artificial gem comprised of lithium aluminum silicate and made in a variety of colors. Neodymium as a coloring agents yields pink lavender colors. A vivid, laser blue variety blue is colored by copper.
See Alexandrite Tsarstone collectors guide, Definition of Alexandrium, http://w.alexandrite.com/viewpage.html?id=GG-086-00009 (An artificial gem comprised of lithium aluminum silicate and made in a variety of colors. Neodymium as a coloring agents yields pink lavender colors. A vivid, laser blue variety blue is colored by copper.) (as of Apr. 06, 2026, 15:30 GMT).