The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...
The gemstone in question was a 2.5 billion-year-old ruby from Greenland, the University of Waterloo stated. Researchers observed that the ruby sample contained graphite, a mineral made out of pure ...
A new report from coloured gemstones miner Gemfields on the emerald, ruby and sapphire markets “… serves as a reminder of how ...