The mine was discovered in a remote part of southern Namibia ... Of that, a little over 10% is considered gem quality and goes for faceting. Color ranges from yellowish green to bluish green, and some ...

Rio Tinto is betting that U.S. President Donald Trump will finally give the green light to its giant copper mine in Arizona, ...

The presence or absence of each and their relative amounts determine the exact color of an emerald crystal. Emerald appearance is sometimes associated with its mine location. Colombian emeralds are ...