Past conferences
Abstracts Library
Colored gemstones of metamorphic origin: Progress report in understanding how they crystallize at depth in East Africa, the Hindu Kush, Pamir Mountains, and the Middle-Urals Ring Structure
It is difficult to reconcile the existence of deposits of trans- parent gems of metamorphic origin with the observation attributed to Robert Boyle (1627–1691) that the best crys-
Gem zircon and sapphire age dating and application of origin determination: A study from New England sapphire fields, New South Wales, Australia
Ahmadjan Abduryim, Frederick Lin Sutherland, Terry Coldham, Elena Belousova Download Pdf
Pink-orange gem quality euclase from Bahia, Brazil
Euclase, monoclinic crystal system—is a seldomly occurring mineral and with a Mohs hardness of 7 and a perfect cleavage to (010) rarely faceted for use in jewellery, but crystal
The Importance and Methodology of Undertaking a Literature Search for Gemmological Research and Article Publishing
Performing a literature search is a very important—but often neglected—part of doing gemmological research
Challenges in the Detection of Ruby and Sapphire Treatment in the Thai Market
The detection of treatments in ruby and sapphire remains a critical aspect and has become an increasingly complex issue in the gem trade and laboratories alike
Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper
The identification of pigments is carried out routinely mostly by X-ray diffraction, FTIR and Raman spectroscopy as well as visible absorption
Automated Data Processing of Raman Spectra for Supporting Spinel Origin Determination
pinel is a highly valued gemstone, with its color and quality influenced by trace-element chemistry and crystal structure. Accurate determination of its geographic origin is crucia
Novel cultured pearls with ceramic nucleus and possible cause of their strong luster
Cultured pearls with a ceramic nucleus (bead) represent a new type of saltwater cultured pearls that has recently emerged
On the nature of blue rose quartz
Over the past several years, the market for pink-coloured rose quartz has been augmented by variants ranging from colourless through deep rose-pink, to lavender and blue
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
Geographic Origin Determination of Natural Yellow Sapphires: The Preliminary Study
Determining the geographic origin of yellow sapphires plays a critical role in the gem trade, as origin often dictates both perceived quality and market pricing
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
Color Genesis Analysis and Characteristics for Origin Identification of Purple Jadeite
Purple jadeite, renowned for its distinctive purple hues and rich cultural connotations, is highly admired and sought after
Gemological Characteristics of New Transparent Brown Sapphire
A newly observed variety of faceted transparent brown sapphire has recently entered the gem market, prompting gemological attention due to its highly unusual appearance
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
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
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
Hessonite garnet from Angul district of Odisha, India
This study describes hessonite (Fe-bearing variety of grossular garnet), found in the Birlamunda village, located in Palalahada tehsil of Angul district of Odisha state
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
Diamonds from Than Lwin River near Mong Hsu, Myanmar
Sixteen rough diamonds were acquired in 2023 by co-author TTS from a gem dealer linked to Mong Hsu, Shan State, Myanmar
