It is light blue to dark blue in color ... gemstones,’’ said Mr. Foutz of Sterling Turquoise, a fifth-generation dealer. ‘‘No American gem is better branded or better recognized.’’ ...

Passing through, I saw some bright blue objects under a shady tree, and I thought I had found some turquoise jewels ... a rock rich in the dark blue mineral Lazurite. Early artists used ...

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 ...