The G.I.A. does not grade turquoise or see many examples of it in its laboratories, Mr. Moses said, though occasionally it will be asked to identify whether a stone is in fact turquoise and ...

Turquoise - the blue and green gemstone - is often seen as emblematic of the West. A couple of listeners have asked about turquoise mines in Colorado. KRCC’s Shanna Lewis spoke with Clint Cross ...