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

the emerald. Due to its rarity, red beryl stones sell for as much as $10,000 per carat. The Ruby Violet mine, owned by Gemstone Mining, produces 5,000 to 7,000 carats a year. "Gemstone mining map ...

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

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