Past conferences
Abstracts Library
Study of “amethysts” from the French Crown Jewels
Stefanos Karampelas, Eloïse Gaillou, Annabelle Herreweghe, Ugo Hennebois, Farida Maouche, Romain Bolzoni, Steven Riou, Quentin Dartois, Bérengère Meslin Sainte Beuve, Christelle
A convincing glass imitation of larimar (pectolite)
Larimar, a massive blue variety of the mineral pectolite, belonging to the wollastonite group of minerals is known in the trade for few decades now
Hurlbutite from Myanmar
A crystal of the very rare mineral hurlbutite originating from Myanmar (without further locality details) was studied and faceted afterwards in two gems, which we also studied
Modern Cultivation of Freshwater Pearls in China: Advances in Materials, Technique
This presentation explores the modern advancements in freshwater pearl cultivation in China, focusing on the materi- als, techniques, and market orientation driving the industry
Nitrogen aggregates in yellow HPHT and CVD synthetic diamonds
Yuri Shelementyev, Galina Kriulina, Olga Yarapova, Viktor Vins, and Alexander Stolyarevich
Pink to Red and Violet Diamonds from the Argyle Mine, Australia: Properties, Color Origin and Latest Research Results
The Argyle Mine was by very far the largest producer of pink to red diamonds worldwide and the only producer of violet diamonds
Spinel from Sri Lanka – An update
Most of the spinels are found in shades of red to purple. Colourless, green and cobalt bearing varieties also been recorded in few locations
Shining light on “480 nm band” diamonds: Gemmological characteristics of an unusual group of diamonds with yellow and red luminescence
Fancy colour diamonds that derive their colour from nitro- gen-related defects (such as N3/N2 centers or C-centers) are relatively common and well-studied
Found, Lost, and Found Again: The Geological and Gemological Significance of the Salininha Emerald Deposit, Brazil
The Salininha emerald deposit located in the municipality of Pilão Arcado, Bahia State, represents the first economically significant discovery of gem-quality emer- alds in Brazil
HFSE-enriched sapphires of gem quality: A combined FTIR and trace element study and implications for heat treatment detection
Gem-quality sapphires containing ‘exotic’ elements such as Sn, Nb, Zr, Ta, W, are of special interest in gemmological research, as the concentration of these so-called high-fie
Historic Emeralds and their Geographic Origin: A Retrospective Study
When it comes to the geographic origin of gems, curiously enough, historians sometimes put forward provenance without any documentary or scientific proof
Rubies from Greenland
Gemology is traditionally practiced in laboratories, focused on identifying and analyzing gemstones. Vincent Pardieu’s journey, however, took a different path
Dyed purple Jade (Lavender jade or purple “Fei Cui”) from Mandalay’s jade market, Myanmar
Jade or "Fei Cui" are trade names for a stone that typi- cally contains only one or more main mineral components, including jadeite, omphacite, and kosmochlor
Low Temperature Heat Treatment of Madagascar Sapphire
One of the challenges facing gemologists today is the detec- tion of low temperature (below 1200°C) heat treatment in corundum (Hughes et al., 2017)
Blue sapphire from Malacacheta of Minas Gerais, Brazil
Malacacheta, located in Minas Gerais, Brazil, is renowned for its alexandrite deposits and com-plex geological setting
Morphologies and Surface Features of Diamond Samples from Southern Thailand
In 1955, the first report on Thai diamond was made by Dr. Payome Aranyakanon, a renowned tin exploration geologist of Thailand Department of Mineral Resources
An approach to understanding the factors in the emerald enhancement clarity grading system used at CDTECGemlab
Emerald is the green variety of beryl, with its distinctive color resulting from trace amounts of chromium, vanadium, and iron
Fe-Ti charge transfers: A comprehensive review and its applications to minerals and gems
The iron-titanium charge transfer (Fe-Ti CT) is mentioned in numerous articles as the source of the coloration of many nat- ural minerals and some man-made materials, but no global
Bertrandite in Emeralds
Over the past few years we have been seeing more and more lower quality stones in the lab. The reasons for this may be related to lack of supply of finer goods, rising prices, the
Zoisite and its many color
The mineral zoisite is a calcium alumosilicate belonging to the class of silicates, more exactly sorosilicate minerals
