Study of “amethysts” from the French Crown Jewels
Stefanos Karampelas, Eloïse Gaillou, Annabelle Herreweghe, Ugo Hennebois, Farida Maouche, Romain Bolzoni, Steven Riou, Quentin Dartois, Bérengère Meslin Sainte Beuve, Christelle Gliksman, Thiala Magalhaes, Valentine Demetz, Aurélien Delaunay
Blue sapphire from Malacacheta of Minas Gerais, Brazil
Malacacheta, located in Minas Gerais, Brazil, is renowned for its alexandrite deposits and com-plex
Padparadscha Sapphire & heat treatment
In 2018 the Padparadscha engagement ring of Princess Eugenie (Figure 1), the niece of the king, gave
