Geographic Origin Determination of Natural Yellow Sapphires: The Preliminary Study
Montira Seneewong-Na-Ayutthaya, Bhuwado Wanthanachaisaeng, Thanong Leelawatanasuk, Wilawan Atichat, Sirinapa Saengdech, Pimlapat Kamkaew and Tasnara Sripoonjan
Gemological Characteristics of New Transparent Brown Sapphire
A newly observed variety of faceted transparent brown sapphire has recently entered the gem market,