Q&A – GRS forges solid path in gem treatment detection
Authors: Adolf Peretti Published in: Jewellery News Asia – January 2016 Download Publication
08/01/2016
14/09/2015
GRS Alert: A new type of synthetic spinel appears at the Bangkok show
Introduction In May 2015, the author (AP) was made aware that a company in Thailand (Tairus Co. LTD, Bangkok) had commissioned to a laboratory in Russia the production of new types of synthetic spinel of “lavender” colors by the method of crystal pulling from flux. This technique is the same used at the Institute of […]
10/09/2015
New generation of pulled synthetic spinel from Russia imitating natural ‘Lavender’-colored and natural ‘Cobalt’ spinel from Vietnam
Authors: Adolf Peretti, Willy Bieri, Matthias Alessandri, Andre Huber, Mario Meier Published in: Contributions to Gemology 11 Download Publication
01/05/2015
New type of treatment of spinel discovered involving heat treatment and cobalt-diffusion
Authors: Adolf Peretti, Detlef Günther, MTM Haris Published in: Contributions to Gemmology No. 11 Download Publication
01/05/2015
Heat-treatment of spinel
Authors: Adolf Peretti, Ngwe Lin Tun, Thomas Armbruster Published in: Contributions to Gemmology No. 11 Download Publication
01/01/2014
Spinel’s alluring features
Authors: Adolf Peretti Published in: Jewellery News Asia – January 2014 Download Publication
01/10/2013
GRS expedition to the Mogok ruby, sapphire and spinel mines
Authors: Adolf Peretti Published in: Jewellery News Asia – October 2013 Download Publication
01/09/2013
Teaser – Mogok mines, spinel come into focus at Sept HK fair
Authors: Adolf Peretti Published in: Jewellery News Asia – September 2013 Download Publication
01/01/2010
Chemical composition of apatite inclusions in corundum and spinel determined by LA-ICP-MS and its potential for authentication and provenance determination
Authors: Willy Bieri, Adolf Peretti, Bernard Grobety, Kathrin Hametner, Detlef Günther Published in: GRS Online Publication Download Publication
01/08/2003
Expedition to the Namya mines in Northern Burma
Authors: Adolf Peretti, Anong Kanpraphai Published in: Contributions to Gemmology No. 2 Download Publication
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