Ruby in the RoughIts green surroundings showcase a ruby from Tanzania in its unpolished beauty. Rubies, valued as precious gems, are the mineral corundum in its red form. Perhaps the country best ...

The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green ... There are many examples in nature, including gemstones and paint pigments.

While crystals and gemstones are often admired for their ... break down and release harmful particles. This mesmerizing green mineral is a uranium ore, which makes it highly radioactive.

Malawi has frozen exports of gemstones and precious minerals and stopped issuing new mineral export licences while it reforms the way the sector is administrated, the government said late on Wednesday ...