‘‘They’ll only part with their stones out of necessity.’’ Among the many varieties of turquoise ... to dark blue in color, with a white matrix usually dyed black; also comes in green.

A popular example is King Tut's funeral mask which is adorned with turquoise, the Geological Institute of America reports. The stone spans from blue to green in color. Occasionally, a dark ...

Turquoise stones from the blue and green master sets at the Turquoise Museum in Albuquerque.Credit...Adria Malcolm for The New York Times Supported by By Janelle Conaway Reporting from Albuquerque ...