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14/10/2017

Identifying new Kashmir-type sapphires from Madagascar

Authors: JNA Published in: Jewellery News Asia – October 2017 Download Publication

PDF, Sapphire
21/05/2017

Identification of sapphires from Madagascar with inclusion features resembling those of sapphires from Kashmir (India)

Authors: Adolf Peretti, Francesca Peretti Published in: ICA InColor – Spring 2017 Download Publication

PDF, Sapphire
25/06/2016

GRS unveils new book on Mogok ruby

Authors: Adolf Peretti Published in: Jewellery News Asia – June 2016 Download Publication

PDF, Ruby
08/01/2016

Q&A – GRS forges solid path in gem treatment detection

Authors: Adolf Peretti Published in: Jewellery News Asia – January 2016 Download Publication

Emerald, PDF, Perettiite, Rare Minerals, Ruby, Sapphire, Spinel, Synthetics, Various
02/11/2015

Perettiit – Ein Mineral erhält den Namen seins Entdeckers Dr. Adolf Peretti

Authors: Bryan Pavlik Published in: Gemmo News Ausgabe 42 Download Publication

PDF, Perettiite, Rare Minerals, Various
01/11/2015

Mozambique – rubies gaining favour in the gemstone world

Authors: Adolf Peretti Published in: Jewellery News Asia – November 2015 Download Publication

PDF, Ruby
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

PDF, Spinel, Synthetics
10/09/2015

NDT breaking the 10-carat barrier

Authors: Adolf Peretti, Branko Deljanin, Matthias Alessandri, Mikko Åström, Andrey Katrusha Published in: Jewellery News Asia – September 2015 Download Publication

Diamond, PDF, Synthetics
Latest GRS Alerts
New types of synthetic periclase identified by C2S inclusions – dicalcium silicate cement hardener 19/12/2018
Warning: Synthetic Padparadscha sold as Natural in the trade. 11/09/2018
GRS Alert: Unusual phosphorescent pebbles identified as synthetic aggregates 24/04/2016
Recent Posts
Video: Mozambique Ruby Collection – A Lifetime Experience 05/05/2020
Color stability test: Overview of “type” classifications 23/12/2019
Introducing GRS brilliancy-type “vibrant” 14/11/2019
GRS Newsletter

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