Latest GRS News


The Perettiite Space Odyssey

A compilation of footage of the rare and complex silicate–borate mineral Perettiite-(Y). It was first discovered in 2015 by Dr. A. Peretti as an inclusions in a phenakite crystal from Mogok, Myanmar.


Warning: Synthetic Padparadscha sold as Natural in the trade.

During testing at GRS we have encountered an orangy-pink sapphire reminiscent of heated padparadscha. An 8.60 ct example was identified as synthetic during high-tech testing, identified as containing Cr and Ni concentrations, and a broad infrared band around 3000 cm-1. Although the customer was informed of the stone being synthetic, it might be possible that […]

Alerts, News

Updated terminology for HPHT-treated sapphires

Meggen, 7 September 2018 GRS has decided to update the treatment disclosure terminology used for sapphires enhanced by heat at elevated pressure (published in the literature as HPHT, Song, J. et al. 2015) Generally the pressure applied to diamonds during the diamond HPHT treatment process is much higher than that of the sapphire treatment. GRS […]

News, Uncategorized

Retake of GRS presentation from 2018 GILC meeting in Tucson, AZ

Due to numerous requests from members of the trade who were not admitted to this years GILC meeting, we have recorded a recap of the speech given by Dr. A. Peretti and made it available for the public. The topic of GRS’ presentation is “Color and Origin”, where we elaborate our approach towards the use […]


GILC Meeting in Tucson 2018

GRS will be present at this year’s GILC (Gemstone Industry & Laboratory Conference) in Tucson. The main discussion points will be relating to color and origin of gemstones with the following topics: The validity and necessity of terms such as Pigeon Blood, Royal Blue, etc. Validity and necessity for African Paraiba tourmaline. Update on the […]


Update of Color-Grading for GRS-type “Pigeon’s Blood” Borderlines

Introduction of two new color-descriptors; “Vivid Red to Deep Red” and “Intense Red to Vivid Red”   After collecting valuable feedback from the trade gathered at GRS public seminars, trade shows and symposiums, GRS announces that it is further subdividing the field of colors that are covered by the term GRS-type “Pigeon’s Blood” by introducing […]


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 […]


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 […]

Alerts, News

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 […]


An ethical debate concerning ‘pigeon’s blood’ rubies and ‘royal blue’ sapphires from diverse origins

by Dr. A. Peretti, Director GRS   Lucerne, 6 November 2015 – The descriptive terminology of Pigeon’s Blood and Royal Blue colors first appeared on gemstone reports issued by GRS in the late 90’s (see timeline below). Since then, thousands of such reports have been issued with wide acceptance by the international trade. The specific grading criteria […]