Authors: Adolf Peretti, Francesca Peretti, Anong Kanpraphai, Willy Bieri, Kathrin Hametner, Detlef Günther
Published in: Contributions to Gemmology No. 7
Authors: Adolf Peretti, Francesca Peretti, Anong Kanpraphai, Willy Bieri, Kathrin Hametner, Detlef Günther
Published in: Contributions to Gemmology No. 7