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
Padparadscha Sapphire & heat treatment
In 2018 the Padparadscha engagement ring of Princess Eugenie (Figure 1), the niece of the king, gave