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Incredibly beautiful, rich purple-blue color of tanzanite stone made ??it one of the most popular gemstones in recent times. Found only in Tanzania, near the town Arusha, Tanzanite stone maybe is not so rare on the number of extracted stones, but is rare in its inaccessibility in the markets, and its insufficient quantities. Tanzanite is a stone in thousand times rarer than diamond, because diamond deposits are constantly found, but tanzanite has only one place were is extracted, already coming to the end. According to geologists, the last raw tanzanite will be produced no later than in 15-20 years, buy tanzanite jewelry! In the first decade after the discovery of tanzanite it was mined from the surface layers of the soil, which was dug in to a depth of one meter and and after sieved. Gradually the mining on surface came to the end, and the miners began digging in depth. And then was discovered a strange consistent pattern : the deeper into the earth was found tanzanite crystals, the less and less blue colored they were .. At a depth of 10 meters, already in the best case were found only green colored stones. Tanzanite - three-chroic stone that shows a constant strong pleochroism. The colors correspond to the three optical axes of the heat-treated tanzanite - "sapphire" blue, dark green and purple (very rarely - purple). The correct spatial orientation is the most important aspect and complex problem while cutting, because must be taken in to account the spread of light for each of the three directions. Because of their similarity in color comparisons between tanzanite and sapphire are inevitable. From the standpoint of cleanliness, tanzanite stands much higher than sapphires. But tanzanite don't have the hardness inherent to sapphires .. The most valuable colored sapphires are more rare, denser, stronger and more expensive, buy tanzanite rings. Historical prices for tanzanite showed remarkable variability and fluctuations. Wholesale prices for these stones ranged between $ 15 to $ 1000 / per carat for the past 20 years. As a function of supply and demand, the price of tanzanite, once climbed, will never drop too low, because of their beautiful color, clarity and lack of accessibility.
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