Latest GRS News


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 […]

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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 […]


Update of GRS type “Muzo green” emerald report policy

Lucerne, Switzerland – 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. Gathering helpful feedback […]


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 […]

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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 […]


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 […]


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 […]

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