Treatments and other gemmological news
More about this subject in CIGem News Spring 2009
GIA News from Research: Special Issue on Red Feldspar (September 10, 2009)
UV LEDs in Gem Identification, presented by Wolf Kuehn, Director of Education, C.I.G. Download poster
Reports on the Paraiba Tourmaline issue
United States Patents regarding colour enhancement and treatments of gemstones; makes interesting reading!
GEMLAB RESEARCH & TECHNOLOGY
Laboratory Alerts and News
Lab Reports from Gemmological Association of All Japan
About Gemmology World
Gemmology World Quiz 
C.I.G. Jewellery Arts Program
The Gemstone Inclusion Library
GemForum - The Information Exchange
CIGem News Sign up (click on the edition you
want to read): August 2008 - September 2008
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/ html - November 2008
/ html - December 2008
/ html - Winter 2009
/ html - Special GIT2008 edition
/ html - Spring 2009
/ html - Summer 2009 / html - Fall 2009 /html - Winter 2010 html
Laboratory Alerts and News - older Lab News have been filed HERE; a new webpage opens.
The Appraiser's Corner - on-line reference guide for gem identification - go HERE; a new webpage opens.
Lead Glass filled Star Rubies from Madagascar from GIA Thailand (February 1, 2010)
Gemstone News
Honor Thy Father: Louisville Gem Dealer Acquitted of Charges in Estate Jewelry Case - From Colored Stone Magazine (July 2009)
- Yehuda vs Blue Nile (January 17, 2009)
GIT 2008 2nd International Gem & Jewelry Conference, Bangkok, Thailand, March 9 - 12, 2009 102 Kb
Reports on the Andesine/Labradorite issue
from ISG (April 30, 2009)
to lateritic soil as an explanation for anomalous tourmaline reactions by Johnson AGTA ePrism March 09
(April 14, 2009)
Beware of Fakes and Imitations (Oct. 8) and The continuing mystery of the Tibet andesine mine! from the ISG (September 22, 2009) - from ISG (May 12, 2009)
- from ISG (May 7, 2009); ongoing discussion on Gemology Online Forum and ISG Student Forum Board
All A.G. (C.I.G.) diploma holders have access to our laboratory services.
Through Gemlab Research and Technology (GLR&T, our internal lab facility) we are able to assist you in state-of-the art
gem identification.
- Process for the color Enhancement of Gemstones
- Method for Enhancing the Color of Minerals Useful as Gemstones
1.5 MB
The 1995 ICA World Gemstone Mining Report/Part 1The ICA World Gemstone Mining Update/Part 2
New bicolor synthetic quartz reportedFare Dealings in Tucson, February1996Colour Change Garnets from IdahoGIA Announces Refinements for Fancy Colours Incredible Jadeite Fraud at Tucson 1997
Secrets of Nova Diamond Colour Unlocked
Pulsed cathodoluminescence matter analyzer
Paraiba Tourmalines GRS Contributions to Gemmology No.9, May 2009 GIA Laboratory Bangkok's "Ongoing Research" page Flux grown synthetic red spinels Fracture healing/filling of Mong Hsu ruby The Tanzanian “Winza“- (Dodoma) Rubies GRS Contributions to Gemmology No.7, April 2008New Rubies from Tanzania, SSEF Newsletter May 2008
Diamond Cut Study Project - Links from OctoNusSSEF Facet No. 14 - January 2007 Gem Quality CVD Synthetic Diamond - from Australian GemmologistBeryllium Diffusion of Ruby and Sapphire 1.2 MB, From Gems & Gemology, Summer 2003
Lab Reports from The Gem and Jewelry Institute of Thailand Durability of significant fissure filled ruby with lead-glass New Geological Origin: Ruby from Winza of Tanzania Rutilated Quartz Filled with Transparent Materia Cu-Bearing Synthetic Beryl in “Paraíba Colour Synthetic opal called “MexiFire” and “PeruBlu” Identification of heated / unheated status on ruby and sapphire Detection of filling material in fissure and fracture of emerald New Coating Treatment on Diamond Experiment of HPHT treatment of diamond and gemstones Up-to-date Be-diffused Blue Sapphire Laser tomography - a laboratory technique for the microscope
ICA Early Warning - Laboratory Alerts. For more info visit the International Colored Gemstone Association's (ICA) own GEMSITE.
Rubies from A New Deposit in Tanzania Rubies with Unusual Characteristics Update on an Uncommon Lead-Glass Treated Ruby Fracture-Filled orangey pink sapphire with lead glass News Treatment on clarity enhancememt of ruby: Not only lead New treatment onf ruby: Lead glass filling Irradiated Topaz: Harmful or not? Why? Whole Round Freshwater Cultured Pearl Irradiated Topaz: Harmful or not? Why? Fracture Filling in Alexandrite Corundum with glass filled fractures and/or cavities enhacing the clarityNo. 84: Jadeite Jade AssemblagesNo. 85: Glass Imitations of "Mexican" OpalNo. 86: New Treatment of Natural RubyLaboratory Alert No. 87: Highly Radioactive Chrysoberyl Cat's Eye Detecting HPHT treated Diamonds
SSEF Swiss Gemmological Institute offers new method for beryllium detection - LIBS Spectroscopy 1,195k
GIA GTL's Color Grading Of Fluorescent Diamonds - Consumer Deception? by Adamas Gemological Laboratory
LMHC Information Sheets
The Laboratory Manual Harmonisation Committee (LMHC) consists of representatives of the following renowned gemmological laboratories: AGTA-Gemological Testing Center (USA), CISGEM (Italy), GAAJ Laboratory (Japan), GIA-Gem Trade Laboratory (USA), GIT-Gem Testing Laboratory (Thailand), Gubelin Gem Lab (Switzerland), SSEF Swiss Gemmological Institute (Switzerland).
Information Sheet 1 March 24, 2004
Corundum with residue from the heating process present in healed fissures and/or cavities
Information Sheet 2 Update December 2006
Corundum - lattice diffusion of foreign elements other than hydrogen
Information Sheet 3 Updated January. 2006
Corundum with glass filled fissures and/or cavities enhancing/modifying the clarity
Information Sheet 4 Updated April 2007
Padparadscha sapphire
Information Sheet 5 Update July 2007
Emerald - fissure filling / clarity enhancement
Information Sheet 6 Implemented January 15, 2007
Paraíba tourmaline
Information Sheet 7 Implemented January 15, 2007
Corundum - No indications of heating and Indications of heating
Composite and leaded/filled rubies - How to deal with them
Gemstone Inclusion Library - Samples and Inclusion Glossary
Inclusion Album - From the GRS - Gem Research
Inclusion Pictures - From the AIGS Gem Testing Laboratory
Gallery of Inclusions - by Vincent Pardieu
Les Inclusions (Inclusions) - in French
Spectra Database from Gemlab.UK
RRUFF: database of Raman spectra, X-ray diffraction and chemistry data for minerals
Spectre d'Absorption (Absorption Spectra) - in French
Mineralogy Database - an excellent reference
FARLANG - A collection of 25,000 pages, covering gems, diamonds, mining, gemology
Pearl-Guide.com. Excellent resource for pearls.
Gems & Gemology Free Article Downloads
Gems & Gemology Free Archives, 1934 - 1980, from the GIA
Rants & Slants articles From Richard Hughes ruby-sapphire.com
Judge orders refund in sale of treated beryls
Laser tomography: a new tool to uncover evidence of heating in ruby and sapphire
Guidelines with Respect to the Sale and Marketing of Diamonds, Coloured Gemstones and Pearls. Download brochure 252k
JVC Appraisal Guidelines/Part 1
JVC Appraisal Guidelines/Part 2
AGTA Gemstone Enhancement Manual
Gemological Institute of America
Gemmological Association of Great Britain<
Deutsche Gemmologische Gesellschaft
Asian Institute of Gemmological Sciences
Canadian Institute of Gemmology
GEMMOLOGY CANADA - The
Electronic Magazine
Instituto de Gemologia del Pacifico - Pacific Institute of Gemmology
GEMOLOGIA INTERNACIONAL Incluso publicaciones online...
Pazifisches Institut für Gemmologie - Pacific Institute of Gemmology
GEMMOLOGIE INTERNATIONAL
Neuigkeiten, Veröffentlichungen online...
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