Since late 2007, rubies and sapphires have been mined by hand methods from both eluvial and primary deposits at Winza in central Tanzania. The gem corundum is related to “dikes” of amphibolitic rocks ...

A hand-held flashlight reveals the green color of a rough emerald from the Coscuez Emerald mine in Colombia. Photo by Eric Welch/GIA. Emerald is the green to bluish green variety of beryl, a mineral ...

This advertisement has not loaded yet, but your article continues below. Images of the tests showed what appeared to be a BMW sedan being destroyed and old models of tanks being blown up More than ...

With over a decade of crypto coverage, Cryptonews delivers authoritative insights you can rely on. Our veteran team of journalists and analysts combines in-depth market knowledge with hands-on testing ...

Botswana is the second biggest producer of natural diamonds, behind Russia, and has been responsible for all the biggest rough gems found in ... emphasis on processing mineral resources for ...