Almost all purple and blue varieties of the stone are the result of heat treatment. The stone is a yellowish-brown bug juice color when it is mined, but when heated to between 426.7-482.2 degrees celsius, it becomes that gorgeosu violet blue that is used in jewelry.The stone has never been found in another locality, so it is indeed a depleting resource. 110ct pear 7×5mm natural gem violet blue tanzanite pear. It is somewhat soft (6-7 on mohs scale of hardness) and has a direction of cleavage along which ti can be easily broken. It is desirable beacuse of its elegant, opulent color.
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