In early 2009, the GIA Bangkok lab released a preliminary study on Niassa province rubies, based on samples (reportedly from Niassa) collected in Chanthaburi, Thailand. In May 2009, less than a year after the arrival of rubies from Niassa on the market, a second important deposit was discovered near the city of Montepuez, in the neighboring province of Cabo Delgado. Mining activity rapidly increased, and rubies from Mozambique (unheated, heated or filled with lead glass) became very common in trading centers such as Thailand, as well as the United States and the rest of the world. Download PDF to view.
