The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...

Both rubies and emeralds are minerals, which is a type of rock with a consistent chemical composition and a highly ordered ...

The emerald was discovered in a beryl mine in 2001 and later smuggled out of the rainforest and to the US by mules — one of whom was reportedly attacked by a panther during the mission.

One feature of compounds made with transition metals is their intense colour. There are many examples in nature, including ...

Estimates of its worth vary but are as high as $925 million. The emerald, Brazilian authorities say, was discovered in a beryl mine in the country in 2001 and later smuggled to the U.S. There ...