Alexandrite

Color: color change, from bluish green (daylight) to purple, red or brown (incandescent light) Hardness: 8 Refractive index: 1.74 - 1.77 Density: 3.68 - 3.80 Chemical composition: BeAl2O4 Crystal structure: orthorhombic Origins: Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma, India. Alexandrite is a color changing varietal of Chrisoberyl. Stones with a strong color change effect are more valuable and represent the most expensive gemstones. Alexandrites are generally not treated. To invest in Gems : www.gemsinvestors.com