AAAGrade Turquoise. Turquoise is not all that common a mineral, requiring the fusion of three particular chemicals and a couple of particular geological conditions, namely: voids in rocks allowing the chemicals to gather, and an arid environment, for water flows will wash away the solution before it can solidify and harden. And then only a small portion of everything coming together to form Turquoise will be tough enough and hard enough to take some sort of reasonable polish.
There are only a few world areas where Turquoise of commercial colour and quantity is found: the dry eastern hilly regions of ancient Persia supplied ancient Rome, ancient Egypt, the Middle East and India; the mines of Tibet and China supplied all east of India; and the Turquoise deposits of Southwest United States, mainly in Nevada and Arizona, served and still serve the insatiable American demand for the gemstone.
The colour of gemstone Turquoise can range in the blue to green of the spectrum, and sometimes will extend into a yellow tinge, but the most rare and costly Turquoise colour, the AAAGrade Turquoise colour, is an unequivocal blue, and really, only the eastern hilly regions of ancient Persia, and some of the mines of Southwest US, produce with some consistency this fabled colour, the colour of the above AAAGrade Turquoise pendant, which has its origin in the ancient mines of the arid region close by the west Afghanistan border.