REAL-GEMS Natural Raw Rough Gemstone 13 Ct Rare Blue Tanzanite Loose Gemstone for Reiki and Energy Crystal AXF-75, Small, Gemstone, blue tanzanite

Description

Tanzanite's appearance is influenced greatly by its pleochroism, which is the ability of a gemstone to show different colors when viewed in different crystal directions. Tanzanite's pleochroism was documented in scientific papers not long after its discovery. In 1969, American Mineralogist described the gem's pleochroic colors as `red-violet, deep blue, and yellow green.' Today, most gems are heat treated, which removes or reduces the yellow green or brownish pleochroic color, maximizing the blue and violet.