Authors: Adolf Peretti, Igor Villa, Willy Bieri, Kathrin Hametner, Ladina Dorta, Gisela Fontaine, Mario Meier, Detlef Günther
Published in: Contributions to Gemmology No. 10
Authors: Adolf Peretti, Igor Villa, Willy Bieri, Kathrin Hametner, Ladina Dorta, Gisela Fontaine, Mario Meier, Detlef Günther
Published in: Contributions to Gemmology No. 10