Tanzanite - the wonder gemstone

Tanzanite is one of the results of a chemical compound called zoisite, composed of calcium, aluminium and silicate. 
In rough, it tends to be a greenish, brown colour with ruby inclusions gemstone but through heat treatment yields a fascinating array of blue, purple and violet tones. 
Some of this gemstone appeared from time to time in the Arusha mining stores, usually brought by the Maasai nomads. The legend was that a massive lightning fire swept through the hills of Merelani, crushing the earth and inflicting a process of accidental heat. Maasai herders who keep cattle in the area found beautiful specimens of blue, lilac-coloured stones and collected the first specimens.

It was in the late ’60s that Manuel de Sousa, a Portuguese Goan native, discover it. But it was Henry B. Platt, vice president and director of Tiffany’s in New York, who baptized it and made tanzanite experienced a surge of popularity in the United States. Tiffany used it in its jewellery, presented it to the market and promoted it.

A precious gemstone, especially for its colour and rarity, as it is 10,000 times rarer than the Diamond.

Turquoise is a gem that is widely used since ancient times; it is considered a sacred stone, which carries good luck. Blue to green, with the most expensive varieties being "robin's egg blue". Composed of aluminium phosphate with small amounts of copper and iron is only slightly harder than glass.
It is believed that turquoise changed colour to signal danger and infidelity. It is considered the stone of purification, problem solving and relaxation.
Turquoise is also considered a sacred stone for many American Indian tribes. The Navajos, for example, used a turquoise-based powder with a pigment to make sand paintings to attract rain to dry land. Some natives from the United States and Mexico also place a base of turquoise dust on the graves to protect the dead. The Indian people put it where they want to build their house as an offering to the gods. The Aztecs called it the "Stone of the Gods" and used it as an amulet against evil.


From the French “pierre turquoise”, Turquoise is a gemstone from Turkey. Its name was proposed, in 1678, by the famous stone dealer Jean-Baptiste Tavernier. 
Usually in shades of blue to green, was named not because it originated from this region, but because Constantinople (present-day Istanbul in Turkey) was a relevant trading post of this gemstone. 

Solid and opaque, sometimes presents veins yellow or dark brown to black due to manganese oxide, limonite or other minerals popularly called the turquoise matrix. In certain varieties, pyrite inclusions are visible.

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