Important Note: The author: Vincent Pardieu is an employee of GIA (Gemological Institute of America) Laboratory Bangkok since Dec 2008. Any views expressed on this website - and in particular any views expressed by Vincent Pardieu - are the authors' opinions and do not necessarily reflect the opinions of GIA or GIA Laboratory Bangkok . GIA takes no responsibility and assumes no liability for any content on this website nor is GIA liable for any mistakes or omissions you may encounter. GIA is in particular not screening, editing or monitoring the content on this website and has no possibility to remove, screen or edit any content.
We are gemologists (gemmologists) sharing a passion for gemstones, gemolology (gemmology), gem people and traveling.
You will find in this website gemological expedition reports and some studies of gemological interest.
Visiting many gem mining areas we saw that people in remote mining and trading areas have difficulties to access to gemological publications. As today the Internet can be accessed in most of these gem mining areas and trading centers, the author started to build this website to give gem people living there the opportunity to see the result of the gemological expeditions they were associated in. It is a way to thanks them for their time and collaboration and to help them to get access to more gemological information.
At the same time the author hope that these expedition reports will please the people from consuming countries interested in gemstones and fascinated by their mysterious origins. Our purpose here is to help people facing difficulties to get quality first hand information about gems and their origins to get the information they need through this website and its links.
With our field expeditions to gemstone mines and gem markets around the world, we intend also here to share our passion for photography, gems and our fascination for the work of the "Gem People" bringing gemstones from the ground to magnificent jewelry.
From the gems external beauty to the intimate beauty of gemstone inclusions, from gem lore to the mines, the people and the landscapes gems origin from, we expect to share with you our passion for gemstone beauty.
We also invite you to join us on some gemological forums we are active in as they are convenient tools to get rapid answers to your questions as they are regularly visited by many other passionate gemologists, jewelers, hobbyists and professionals willing to learn more and share their knowledge about gemstones.
Index page: Vincent Pardieu's Blog
About the Author
About me : How did a countryside Frenchman became a "Shameless travel addicted gemologist"? ( Under construction)
Sep. 2005: Madagascar with Richard W. Hughes and Dana Schorr (Will be available one of these days...)
Summer 2005: Gemological expeditions to South East Asia (Vietnam) South Asia (Sri Lanka) and East Africa (Kenya, Madagascar and Tanzania) with J.B. Senoble and Tanguy Lagache with the support of the AIGS, the ICA and the Gubelin Gem Lab:
- Introduction to AIGS/ICA/Gubelin Gem lab 2005 Expeditions
Special THANKS for their support for our field expeditions since 2005:
about gems, gemology, field expeditions, studying gemology, minerals, jade, pearls or jewelry? We recommend these FORUMS where the author is contributing:
Do you want to STUDY GEMOLOGY?
Here are some recommended institutes where the author studied gemology in Thailand ... and was happy about his investment!
For those willing to go further after their gemological studies: Recommended Advanced Gemological Courses:
To finish here are some BOOKS about gemology the author have read and appreciated and would like to recommend to people willing to learn more about gemstones, gemology and the places where gemstones are found:
It is a new study about the lead glass filled rubies. This time it is a specific study about lead glass filled star rubies.
"Lead glass filled Star rubies"
A selection of 34 lead glass filled star rubies showing the color range of the new material from pink to red and to near black. The stones presented weight from approximately 1 to 20 carats. The photograph was taken using a slightly diffused natural sunlight in Bangkok, Thailand. The background used is page 17 of “Gemstone Enhancement” by Kurt Nassau (1984).
This time Mr. Thongdeesuk told us that was about to release in the market some important quantities of lead glass filled star rubies and he would be interested us to study his material and inform the public about it as some stones were very much looking like fine unheated star rubies. So we studied these stones. It was a good occasion to show that gem burners and gemological laboratories like the GIA Laboratory Bangkok can work together. This update will we hope help to inform the market and the final consumer about these stones which if they are not a gemological issue are a serious problem for the trade.
Note about Lead glass filled star rubies: Lead glass filled star rubies are not a completly new thing, if fact the author saw some of them already in 2004 in Bangkok. They were first reported in the gemological literature by the GAAJ on their Jan 2005 update of the lab alert they did about this treatment on April 15th 2004. Recently an interesting study was also published by Thomas Hainschwang in his Gemlab Research Newsletter 06/2009 about lead glass filled star rubies looking quite similar to the lower quality material we saw at Mr. Thongdeesuk office. Is it the material studied by Thomas Hainschwang the same as the stones we studied? Difficult to say as many companies are producing lead glass treated stones nowadays on stones from different origins and using glass of slightly different compositions as the author already explained in his study published in February 2005. In fact there is not one treatment but at least as many treatments as you have companies. Furthermore sometimes the glass used by this or that company for this or that specific customer does not even contain lead but instead it is rich in bismuth or barium creating some terminology issues with the use of "lead glass filled rubies" in the case where lead is not detected. And of course it is clear that the treatment will continue to change as experimentation is still going on.
Summary about the whole "lead glass filled ruby" issue:
On the Gem lab side:
Lead glass filled rubies are very easy to identify for gemological laboratories. They were studied in details and a proper common nomenclature has been established by the gemological laboratories members of the LMHC group to identify them properly:
Here is a link to the LMHC Information Sheet number 3, presenting the current nomenclature use by the six gemological laboratories members of the LMHC (listed by alphabetical order): CISGEM (Italy), GAAJ Laboratory (Japan), GIA Laboratory (USA), GIT-Gem Testing Laboratory (Thailand), Gübelin Gem Lab (Switzerland), SSEF Swiss Gemmological Institute (Switzerland).
On the market side:
Since 2004 when these stones arrived in mass in the market, many stones were sold without proper disclosure. If it was about heated vs unheated, that would have been without consequences but, unlike traditionaly heated stones, lead glass filled rubies present some serious durability issues:
Many stones were damaged particularly when jewelers were trying to use them in jewelry like if they were normal rubies. As the lead rich glass filling the fissures and the cavities can easily be damaged by chemicals like acids or caustic soda, by the heat of a jeweler torch and is also very brittle, many stones were severely damaged in the process. In consuming countries particularly where people are less aware of treatments, people feel to have been cheated. It created a bad name for the product.
Nevertheless as Tom Chatham said: “Gems do not cheat people, people cheat people”.
Sadly very often people buying or selling gemstones do not have enough gemological training to identify properly the stones they deal with. When in addition to that the stones are bought or sold without being properly identified by a gemological laboratory and without proper disclosure then this might not be without some serious consequences for the final customer and the trade when the stone present some durability problems like it is the case with filled gemstones.
That's the whole issue.
With proper disclosure and appropriate pricing, this material has its place in the market for the budget minded buyer who will never be able to afford unheated or traditional heated rubies. With lead glass filled rubies in fact such buyers have now an alternative to synthetics and imitations. Complete and accurate disclosure is the key to protect the buyer, and to build a healthy industry. So what to do?
Some people suggest that we should stigmatize this treatment and change the nomenclature on lab reports. Well, to the author understanding, the issue is not with the stones properly identified by gem labs, it is with the others. So changing the name on lab reports will not solve the trade problem, instead in the author opinion it might just add confusion. So in this case why to put all the gemological terminalogy upside down and take the risk to have a global confusion if it will not solve the main issue for the trade?
In the author opinion the terminology adopted by the gemological laboratories members of the LMHC and presented in the LMHC Information Sheet Number 3 is perfectly adapted to the current situation. With this this solid nomenclautre, what can lab gemologist do more to help the trade in this issue? Probably do our best to inform people about the treatment, publish informative studies like those the author recommend on this blog, remind people willing to buy gemstones that learning gemology can be useful, and if they don't want or cannot, then remind them that there are gemological laboratories who can do the identification work for them.
Hoping that you will find all that interesting and useful!
Important Note: Vincent Pardieu is an employee of GIA (Gemological Institute of America) Laboratory Bangkok since Dec 2008. Any views expressed on this website - and in particular any views expressed by Vincent Pardieu - are the authors' opinions and do not necessarily reflect the opinions of GIA or GIA Laboratory Bangkok. GIA takes no responsibility and assumes no liability for any content on this website nor is GIA liable for any mistakes or omissions you may encounter. GIA is in particular not screening, editing or monitoring the content on this website and has no possibility to remove, screen or edit any content.