Turquoise is the sky-blue gemstone that was originally found in Turkey and therefore got its name from the country of origin. Apart from being a beautiful stone for accessories, Turquoise has ...

Put these three things together, and a blue sky is inevitable. Here's how it all comes together. Light of many different wavelengths, not all of which are visible, are emitted by the Sun.

Legend has it that the infamous Hope diamond brings misfortune to whoever owns it. Well, the Smithsonian National Museum of Natural History added the magnificent sky-blue gemstone to its ...

The writer recalls very vividly the blue aspect of the sky as seen from the top of the San Francisco Mountains in Arizona, which have an altitude of 13,000 feet above the sea; and in an ascent of ...