Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structure
Even though emeralds and rubies are very different colors, they both have the same secret ingredient in their atomic ...
Mining Weekly19h
New report highlights lack of transparency in coloured gemstone industry
A new report from coloured gemstones miner Gemfields on the emerald, ruby and sapphire markets “… serves as a reminder of how ...