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

Until recently, only emerald, ruby and sapphire were officially called precious gems. Everything else was called semi-precious. The precious categorization is a reference to value: a really fine ruby, ...

For over a century, sailors and explorers have reported seeing bizarre emerald green icebergs around Antarctica. Their unusual color has long perplexed researchers, and they have been scrutinized by ...

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