The following information is extracted from The Book of Stones and other sources:
Turquoise is a copper aluminum phosphate mineral with a hardness of 5 to 6. Its striking blue color is caused by copper and the greenish shades are due to the presence of iron. The name Turquoise is derived from pierre turquoise, meaning 'Turkish stone." This is because the trade routes through which turquoise reached the miners in Central Asia went through Turkey, and Venetian merchants often bought the stone in Turkish bazaars. Its use as a gemstone dates as far back as 5000 B.C.
The best quality turquoise comes from Iran, Afghanistan, Australia, Tibet and the Southwestern Uniteds States.
Below are a few of the Turquoise stones I have wrapped.