Latest GRS News


The making of an international color standard by GRS: ‘Pigeon’s Blood’ & ‘Royal Blue’

Definitions, Retrospective and Future By Dr. A. Peretti, Director GRS Laboratories DEFINITIONS While pigeon’s blood color description was used in the past in the literature for rubies, GRS first made a master set for rubies that defined what pigeon’s blood is in comparison to the intensity of red, namely vivid red was chosen as the […]


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 […]

Alerts, News

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:


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 […]


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 […]

Alerts, News

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 […]


GRS Lab Seminar during September Hong Kong Jewellery & Gem Fair, 16th September 2013

The Mogok Mines – New & Previously Unseen 3D Mining Images and The Origins of Spinel – A 10 Year Research Summary On 16th September 2013, GRS held a seminar about the latest GRS expedition to the Mogok ruby, sapphire and spinel mines (Part I) as well as the world of magnificent spinels – provenance […]


Record-breaking discovery of ruby and sapphire at the Didy mine in Madagascar – Investigating the source

GemResearch Swisslab (GRS) is featured in the latest issue of ICA’s magazine InColor (issue Fall/Winter 2012). The article written by Dr. Adolf Peretti and Mr. Lawrence Hahn reports on the record-breaking discovery of ruby and sapphire at the Didy mine in Madagascar. It gives detailed account of how GRS has carried out the risky expedition […]


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 […]


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 […]