The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald green. But have you ever wondered how they get those colors? I am an inorganic ...

Rubies are mainly made up of the mineral corundum, which is composed of the elements aluminum and oxygen in a regular, repeating array. Each aluminum ion is surrounded by six oxygen ions.

It's thought that because of this, the Queen bought her own rubies in the 1960s and 1970s — the Baring ruby necklace was made from a pendant and pair of earrings, and the Burmese ruby tiara was ...

Formed through intricate natural processes, gemstones are in fact crystallised minerals. Two of the most coveted – rubies (the red variety of corundum) and emeralds (a type of beryl) – are ...

Cartier Tourbillon Mysterieux Azure Until recently, only emerald, ruby and sapphire were officially called precious gems. Everything else was called semi-precious. The precious categorization is a ...

(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 ...