Gemological Characteristics of New Transparent Brown Sapphire
Sutas Singbamroong, Tasnara Sripoonjan, Montira Seneewong Na Ayutthaya, Pukkapon Piantumdee, Tanyawit Sutipanya, Khaled Hussein and Nazar Ahmed
Geographic Origin Determination of Natural Yellow Sapphires: The Preliminary Study
Determining the geographic origin of yellow sapphires plays a critical role in the gem trade, as ori