Latest News
21/10/2017
GRS Seminar and Emerald Book Launch in Bangkok

We cordially invite you to our special GRS seminar event in Bangkok in honor of our CEO and founder Dr. Peretti’s 60th birthday. In celebration to his gemological contributions to GRS, we shall be hosting seminars discussing a range of gemological topics and showcasing our latest book project on Colombian Emeralds. It would be our pleasure […]...

24/04/2016
GRS Alert: Unusual phosphorescent pebbles identified as synthetic aggregates

Phosphorescent pebbles are presented in the market as natural rounded pebbles (3.53 density) possessing extraordinary properties such as green phosphorescence when exposed to a strong light source and patchy blue to green fluorescence in short- and long wave UV-light (Figure 1), again with green phosphorescence (no blue). Such items appeared multiple times in the last […]...

27/01/2016
Flying Into The Heart Of The Colombian Emerald-Mining Region

Bogotá, Colombia played host to the First World Emerald Symposium from October 13 to 15, bringing together various stakeholders of the Colombian and international emerald industry. Vital to the event were the various presentations made by Colombian (FEDESMERALDAS) and other trade organizations, private individuals, laboratories, scientists from universities and large mining companies, such as Muzo International […]...

23/10/2015
Update of GRS type “Muzo green” emerald report policy

Lucerne, Switzerland [updated 6 November 2017] – The 1st International Emerald Symposium held in Bogotá, Colombia, October 13-15, 2015 brought together leading members of the gem and jewelry trade from around the world. There, GRS presented its proprietary color-grading concept for emeralds called GRS type “Muzo green” which identifies stones with exceptional color saturation and hue. […]...

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 […]...

19/08/2015
Perettiite Introduced At 8th European Conference on Mineralogy and Spectroscopy in Rome, Italy

8th European Conference on Mineralogy and Spectroscopy September 9-11, 2015 Rome, Italy September 8, 2015 – Museo Di Minerologica, Sapienza Universita Di Roma 16.00-18.00 – Participant registration 17.00-19.00 – Icebreaker party, visit to Mineralogy Museum Many different talks including next day September 9, 2015 – Aula Convegni, CNR 12.15-12.30 – Perettiite-(Y), Y3+2Mn2+4Fe2+[Si2B8O24], a new mineral […]...

21/07/2015
NDT Breaking The 10 Carat Barrier – World Record Synthetic Diamonds Investigated

Introduction The first small manufactured industrial diamonds were produced in 1953 by the Swedish company ASEA but their accomplishment went unannounced. In 1970, General Electric (GE) produced synthetic diamond crystals using the HPHT method with a belt type of press and created a 0.78ct polished RBC colorless diamond. In the 1980’s and 1990’s Russians used […]...

08/06/2015
Record Sale of Magnificent Pigeon’s Blood Ruby and Diamond Necklace

A magnificent Burmese Pigeon’s Blood ruby necklace was sold for a total price (including buyers premium) of more than US$ 13 million at the Christie’s Magnificent Jewels auction on 2 June 2015 in Hong Kong. The achieved price makes it the most expensive ruby necklace ever sold at an auction. The outstanding necklace comprises of […]...

22/05/2015
GRS Alert: New spinel treatment discovered involving heat- and cobalt-diffusion

Introduction Cobalt-spinels are considered one of the most precious spinel and are rarely colored blue with or without grey to black tones. Blue Cobalt spinel are at least 10-100x more expensive per carat than grayish-blue colored spinel. Cobalt intensifies the blue color in spinel, considerably enhancing its beauty. Cobalt-spinel over 5ct can be 10,000 to […]...

22/12/2014
GRS Alert: Warming of Mozambique rubies previously certified as unheated by GRS

We would like to inform our customers that rubies found to be unheated when tested by GRS are sometimes heated after certification and presented as natural unheated rubies to the market without re-certifying with GRS. This very low temperature warming does not require repolishing of the stone and therefore no weight loss and no dimension […]...

27/06/2014
GRS Grand Opening Bangkok

On the 29th June 2014 we celebrated the opening of our new laboratory facilities in Bangkok. Thank you very much everyone for coming and celebrating this milestone with us. Here some impressions from the event:...

14/01/2014
GRS ‘Pigeon’s Blood’ report types for rubies

Burmese Pigeon’s Blood report sample:     Mozambican Pigeon’s Blood report samples: Type A: Ruby from Mozambique with considerable fluorescence is described as previously indicated by the descriptor GRS-type Pigeon’s Blood, owing to a similarity in color with its Burmese counterpart. Type B: Rubies typically appear as vivd red, reminiscent in color saturation of Pigeon […]...

06/11/2013
GRS Alert: Next-generation of synthetic diamonds reach market

CVD-grown Blue Diamonds – Identified by GRS and CGL-GRS laboratories Hong Kong, Lucerne and Vancouver – A distinctly new type of synthetic blue diamond sized from 0.25 carats to over 1.25 carats turned up at both the Bangkok and Hong Kong Gems & Jewellery Fairs in September 2013 along with pink, yellow, and colourless varieties of […]...

24/10/2013
A review of beauty and rarity of Mozambique ruby

by Dr. A. Peretti From today’s perspective, it would be impossible to overstate the significance of African rubies in the gemstone trade. East African ruby, specifically from Mozambique, Tanzania and Madagascar, has recently dominated the market for several reasons; lack of thermal enhancement, brilliancy, size and for its color. No other geographical region has successfully […]...

22/09/2012
New world record Pigeon’s Blood rubies discovered in Madagascar

GRS seminar during the Hong Kong September 2012 Jewellery & Gem Fair New magnificent rubies were found in a National Park near Didy in Madagascar in May 2012. When the rough was first discovered, it was assumed to be impossible to have natural rubies in such size, clarity and color. Therefore the GRS Laboratory made an […]...

14/05/2012
GRS publishes the discovery of a new sapphire mine in Sri Lanka on Youtube

An extreme sapphire rush occurred in February in Sri Lanka which resulted in one of the most spectacular scenes in gemstone mining. GRS was there and collected never-seen movie clips, researched the rocks and collected samples. GRS is proud to publish its latest research on the legendary new sapphire mine near the Yala National Park […]...

19/12/2011
New generation of diffusion-treated sapphire appear in large numbers on the market

A large number of diffusion-treated stones are detected in the laboratory. The diffusion-treatment includes the well-known method of adding Titanium in the surface. Some of the material has been additionally Beryllium-treated. The new aspect of this treatment is that the treaters obviously select already heat-treated sapphire with internal blue color-zoning. Than the stones are diffusion-treated […]...

14/09/2011
Volcanic host-rock of Tibetan red andesine discovered

Hong Kong – Historically, the finest red feldspar (sunstone) has come from deposits in Oregon (USA). While sunstone has also been found in other places like India and Tanzania, the Oregon deposits have set the gold standard. In 2002, rich red feldspars from another source appeared on world markets. The source was originally said to […]...

13/07/2011
Launch of Contributions to Gemology No.10 at ETH Zurich

New andesine test developed by GRS needs high-tech testing at highest level in cooperation with Swiss Universities. Only stones from particular mines can be tested with non-destructive methods. Others need additional destructive testing. Testing is only possible through our Swiss office. Abstract: Red andesine from different collection points in Tibet have been tested for authenticity. […]...

14/09/2009
GRS hosts a conference in Hong Kong on Identification test for Copper-bearing gemstones using copper-isotope ratio determinations by Femtosecond Laser Ablation-MC-ICP-MS

Abstract Identification Test for Copper-bearing Gemstones (Copper-Andesine and Paraiba-type Tourmalines) Using Copper-Isotope Ratio Determinations by Femtosecond Laser Ablation-MC-ICPMS *Gisela Fontaine, *Kathrin Hametner, *Detlef Günther and **Adolf Peretti *ETH Zürich, Department of Chemistry, Wolfgang Pauli Strasse 10, CH-8093 Zurich, Switzerland, **GRS Gemresearch Swisslab AG, Rue du marché 12, 1204 Geneva, Switzerland Cu-bearing gemstones including Cu-bearing Plagioclase […]...

14/09/2008
Important chemical and structural data on Johachidolite published by Swiss universities and GRS in ‘Schreyer Memorial Issue’ of European Journal of Mineralogy

Eur. J. Mineral. 2008, 20, 965–973 Published online July 2008 Johachidolite, CaAl[B3O7], a mineralogical and structural peculiarity Milen KADIYSKI1, Thomas ARMBRUSTER1,*, Detlef GÜNTHER2, Eric REUSSER3 and Adolf PERETTI4 1 Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestr. 3, 3012 Bern, Switzerland *Corresponding author, e-mail: thomas.armbruster@krist.unibe.ch 2 Laboratorium für Anorganische Chemie, ETH Hönggerberg, HCI, […]...

14/04/2007
Advanced research for origin identification in unheated sapphires

GRS proudly announces that it has completed an in-depth research program including several thousand samples of sapphires from various mining areas in the Mogok region of Burma (Myanmar). Intensive study of the inclusion properties in sapphires from these different mining areas allows GRS to add more specific geographical origin information. This information includes the mining […]...

14/06/2006
“Paraiba”-tourmaline research completed – reporting policy of GRS

GRS announces that it has completed its research on “Paraiba tourmalines”. Paraiba tourmaline is a Cuprian-Elbaite of “neon-colors” of pastel greenish-blue to blue hue from the origin of Brazil (lit. 1). Such tourmalines, however, have recently become known from various other origins. The trade had to settle the question whether these tourmalines from these different […]...

01/03/2006
Report on the occurrence of a Be-treated blue sapphire of commercial importance

The colour of the Be-treated sapphire matches other types of conventional heated sapphires (low to medium tone, medium saturation, not dark, no greenish overtone, good transparency and brilliancy). The identification occurred during routine Beryllium-testing at GRS. Testing in immersion did show a slight discoloration from blue to grey in the rim of the sapphire. No […]...

01/03/2006
Detailed chemical profile across the new Be-treated (beryllium) blue sapphires

A faceted approx. 1 ct Be-treated blue sapphire (acquired 2 weeks ago from the market, sold as Be-treated) was cut in half. The half-cut sapphire provided the possibility of measuring the penetration of the Beryllium into the sapphires body (length 5mm and with 3mm). Two profiles were measured across the sample perpendicular to each other, […]...

01/08/2000
Dr. Peretti receives European Geologist (EurGeol) title

Dr.A. Peretti receives the title of a European Geologist, Euro.Geol from the Federation of European Geologists. The title is a strongly protected professional title including checks CDP (Conitnuous Professional Development). It is mentioned in the GRS gemmological reports in the future as “European Geologist” or EurGeol togehter with the gemmological titles “FGG” and “FGA”....