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

If emeralds are a queen’s gem, then rubies are a king’s stone. In Sanskrit, the word for ruby is ratnaraj, meaning king of precious stones.Some peoples believed that rubies held the very power ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Daniel Freedman, University of Wisconsin-Stout (THE CONVERSATION) The colors of ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) One feature of compounds made with transition metals is their intense color. There ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) One feature of compounds made with transition metals is their intense color. There ...