Known for its deep red hue, rubies are highly prized and valued at around $4,625 per carat. One of the hardest and most sought-after gemstones, diamonds cost approximately $9,502.13 per carat. A light ...

The chromium replaces about 1% of the aluminum in the corundum or beryl crystal when a ruby or emerald forms underground at a ...

Estimates of its worth vary but are as high as $925 million. The emerald, Brazilian authorities say, was discovered in a ...

In the world of gemmology, the South American country of Brazil plays host to a variety of precious gemstones.