Hurlbutite from Myanmar
Gravier D., Delaunay A., Boemo J., Arlabosse J.-M., Fritsch E., S. Karampelas
Blue sapphire from Malacacheta of Minas Gerais, Brazil
Malacacheta, located in Minas Gerais, Brazil, is renowned for its alexandrite deposits and com-plex
Bertrandite in Emeralds
Over the past few years we have been seeing more and more lower quality stones in the lab. The reaso