Turquoise Jewelry &amp; Gemstones / Turquoise is among the oldest known gemstones- it has been mined since 3,200 BC. It has been attributed with healing powers, promoting the wearer&#39;s status and wealth, protection from evil and brings good luck.  Chemistry: CuAl6(PO4)4(OH)8*5(H2O), Hydrated Copper Aluminum Phosphate  / by Keith Pings