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Purplish Blue Tanzanite

One of December's birthstones is Tanzanite, the transparent blue variety of zoisite. It is very famous for its strong and magical pleochroism.

Tanzanite has a hardness of 6 and it belongs to the orthorhombic crystal system. It is a brittle material, so it is better if you wear your tanzanite pieces only on special occasions and not everyday. Tanzanite displays a vitreous lustre, thus it is not such a bright gemstone. However, its strong pleochroism, makes it very special! When viewed though the gemmological dichroscope, you can check its trichroic colours, blue,yellow and pink. This is very characteristic of a tanzanite gemstone, so in case your gemstone does not show these colours, then it is not a tanzanite. There is one exception on this rule. If the gemstone is heat-treated then it might display on a violet and blue colour. These are some gemmological secrets, that obviously are not secrets anymore! This phenomenon is depicted on the video below.




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