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Dichroism in a Faceted Tanzanite

Pleochroism (dichroism, trichroism) is the result of selective absorption of different color components of light as they pass through a crystalline gem material. If a pleochroic gemstone is observed under different light sources, it may display remarkably different colors. Tanzanite is a popular gemstone that shows markedly different colors when viewed under different light sources. The next time you purchase a gemstone note what kind of light is being used to display the stone.