Stones of smaller size are appreciated for their soft, lavender tones, while gems that reach bigger proportions can gain striking depths of saturation. Natural zoisite's common brownish hues are removed with simple heat in order to give way to a consistent blue, allowing cutters to choose the most beautiful color from each crystal. To carry the name “tanzanite”, each gem's cool hue is gained from the application of heat, typically by means of treatment. Tanzanite's celebrated blues, indigos, and purples are revealed when zoisite's vanadium trace element reaches specific levels of valency within its crystal structure (Ca2Al3(SiO4)3(OH)). Blue, purple, and an unsaturated, bronze hue can usually be seen in tanzanite with a keen eye. With its trichroic properties, tanzanite can display three different body colors when viewed from varied directions. A variety of the mineral and gemstone zoisite, tanzanite's fame has spread far and wide to create recognition globally. This marketing strategy failed, but Tanzanite remains strong in its own right in the market. ![]() With fine examples known to make blue and purple sapphire and dim, by comparison, tanzanite quickly rose as a stone of importance since 1967, when Tiffany & Co decided to market it as a sapphire substitute. ![]() Tanzanite, in its finest form, has an intense blue/purple color that cannot be mimicked by any other gemstone, which is why it has become so popular as a jewelry stone since its discovery in the late 1960s.
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