The Gemological Institute of America (GIA) has discovered a new mineral, which has been named crowningshieldite in honor of the late GIA researcher G. Robert Crowningshield, it announced at its International Gemological Symposium on Oct. 8. Crowningshieldite was first discovered in two diamonds from the Letseng mine in Lesotho. It was accepted as a new mineral … Continue reading GIA Discovers New Mineral, Crowningshieldite