The London-based mining company Gemfields on Wednesday announced that it has raised 1.47 million US dollars from an auction of commercial and low-quality rubies held from 11 to 13 September. In total, 174 kilogrammes of gems (869,862 carats) were sold with an average sale price of 1.7 US dollars per carat. The gems were mined … Continue reading Ruby auction raises 1.47 million dollars