Pierre taillée achats bouclier fantaisie tanzanite couleur bio naturelle non chauffée unique 2,35 carats

Tanzanite is the blue and violet variety of the mineral zoisite, caused by small amounts of vanadium. Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Tanzania, in a very small mining area near the Mererani Hills. Tanzanites appearance is influenced greatly by its pleochroism, which is the ability of a gemstone to show different colors when viewed in different crystal directions. Tanzanites pleochroism was documented in scientific papers not long after its discovery. In 1969, American Mineralogist described the gems 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. Top-quality tanzanite can be violetish blue --similar to a fine sapphire color --or a unique, predominately violet hue all its own. Some stones might also appear more purplish depending on how the cutter chooses to orient the fashioned gem. Both the violet and blue pleochroic colors are readily visible in a fashioned stone when it is gently rocked and tilted. This means that every tanzanite is a blend of these pleochroic colors. The exact face-up color depends on the inherent color of the original rough, its size, the pleochroic colors the cutter favors when they orient the fashioned stone, and the light the finished gem is viewed under. Cool lighting --like daylight equivalent fluorescent --will emphasize tanzanites blue, while warm lighting --like incandescent --will make it appear more violet-to-purple

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