Tanzanites:

Tanzanite is found in only one mine in Africa, Tanzania. The mine is on the foothills of Kilimanjaro. The name Tanzanite originates from its country. The stone was originally found by a Masai tribesman, in the Mererani Hills of the Manyara Region in Northern Tanzania in 1967. It is estimated that only 30 years of the supply remain in the mine. The colour ranges from Exceptional to Pale and is identified by a B or V which indicates a predominance of blue or violet hues. The deeper the colour, the more valuable the stone. It is important to have a symmetrical cut stone with the correct portions, depth and centre culet. A poor cut results in a larger stone. The clarity refers to the imperfections that may occur in the stone. Tanzanite in its natural state looks like a brownish colour. The friction of the polishing wheel causes heat and this releases its beautiful blue/violet colour.