Thanks and disclaimer:


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.


About FieldGemology. org

This website is home for "Shameless Travel Addicted Gemologist" Vincent Pardieu (B.Sc., GGA, G.G.). Vincent is "Supervisor, Field Gemology" at GIA Laboratory Bangkok. He is a gemologist specialized on "origin determination of gemstones".
This is also home for Vincent's regular traveling companions: David Bright, Jean Baptiste Senoble, Richard W. Hughes, Guillaume Soubiraa, Walter Balmer, Michael Rogers, Kham Vannaxay and many others like recently: Philippe Ressigeac, Oliver Segura , Flavie Isatelle and Lou Pierre Bryl.

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.


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About me : How did a countryside Frenchman became a "Shameless travel addicted gemologist"? ( Under construction)


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Popular Articles

"Tsavorite, an Untamed Gem" with R.W.Hughes, first published in ICA's InColor (Winter 2008)
"Working the blue seam" The Tanzanite mines of Merelani with R.W.Hughes first published on
"Spinel, the resurection of a Classic" with R.W. Hughes, first published in ICA's InColor (Summer 2008)

Gemological studies

(Apr. 2009) "Sapphires reportedly from Batakundi / Basil area" a preliminary study about unusual sapphires we saw at GIA Laboratory Bangkok
(Mar. 2009) "Rubies from Niassa province, Mozambique" a preliminary study about rubies we saw at GIA Laboratory Bangkok
"Lead glass filled rubies" :
First published on AIGS Lab Website (Feb 2005)

Expedition Reports

Autumn. 2009: GIA Field Expedition FE09: Rubies from Mozambique. (pdf file)

May. 2009: GIA Field Expedition FE08: Melos and their pearls in Vietnam. (pdf file)

Dec. 2008 and Feb-Mar. 2009: GIA Field Expeditions FE01 and FE04: Rubies and sapphires from Pailin, Cambodia. (pdf file)

Aug. 2008: Sapphires and Tsavorite from the south of Madagascar with the AFG (Association francaise de Gemmologie) : Available soon...

Apr. 2008: Expedition to the new Winza ruby deposit in central Tanzania with Jean Baptiste Senoble and the support of the Gubelin Gem Lab

October 2007: Gemological expedition to East Africa (Kenya and Tanzania) with Richard W. Hughes, Mike Rogers, Guillaume Soubiraa, Warne and Monty Chitty and Philippe Bruno:

Summer 2006: Expeditions to Central Asia gem wealth with Guillaume Soubiraa and the support of the AIGS, the ICA and the Gubelin Gem Lab:

Oct. 2005: Colombia by J.B. Senoble

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:

- Feb. 2005: A visit to Thailand, Cambodia with the AFG (Association Francaise de Gemmologie) (under construction)

- 2002-2007: Expeditions to Pailin (Cambodia), Chanthaburi Kanchanaburi (Thailand) Houay Xai (Laos) Mogok, Namya (Burma) (under construction)

- 2001: Expeditions to Namya, Hpakant and then Mogok with Ted and Angelo Themelis and Hemi Englisher (under construction)

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Discover fieldgemology newsletter:
(Currently under "hibernation status"...)

Number 01: Sept 2006
(I know: it was long time ago...)



THANKS for their support
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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

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:




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All the best,

June 6th, 2010 | Keywords:pearl , melo , Vietnam , Ha Long Bay , pearl farm Travel |
Blog Title: FE16 Pearls of Vietnam 2010:

GIA FE16 (GIA Laboratory Bangkok Field Expedition 16): April 08th, 2010 - April 15th, 2010:


Introduction to the Vietnam Pearls 2010 expedition: The GIA Laboratory Bangkok Vietnam 2010 field expedition was planned with the support of Dr. Pham Van Long from the Vietnam National Gem and Gold Corporation. It was scheduled during the Songkran holidays (Thai New Year) 2010, in order to enable Nick Sturman (Supervisor, Pearl Identification at GIA Laboratory Bangkok) and Kham Vannaxay (an expert on pearl farming and gems from South East Asia working at Sofragem in Bangkok) to join the author for the first part of the Vietnam expedition dedicated to pearls with the visit of Cat Ba island, and two pearl farms one in Ha Long Bay, the other in Bai Tu Long Bay.

To complete the team the author had the pleasure to travel this year with five young gemologists: First two intrepid young women who just finished their gemological studies at GIA Thailand: Tracy Lindwall (USA) and Jazmin Amira Weissgärber Crespo, (Germany) then three young French gemologists: Philippe Ressigeac who got his G.G. from GIA Thailand in 2009 and Herve Rezo and Pierre Hemon, studying the DUG (Diplome Universitaire de Gemmologie) in Nantes University with Prof. Emmanuel Fritsch and Dr. Benjamin Rondeau.


(GIA Lab Bangkok Supervisor for Pearl Identification, Nick Sturman, with Tracy Lindwall (G.G.) and Jazmin Amira Weissgärber Crespo (G.G.) with melo snails on a Vietnamese fisherman boat in Cat Ba Port.)
Photo: V. Pardieu / GIA Laboratory Bangkok, 2010

The first part of the expedition was focus on the coast and its pearls.

Part 1: Dragon Pearls: The Quest for Melo Pearls: Last year while visiting Vietnam with gemologists Jean Baptiste Senoble (A.G.) and Lou Pierre Bryl (F.G.A.) we went on a quest for melo pearls from the cozy house of an antic dealer in Hanoi to Cat Ba Island harbor and sea food restaurants... This year, while visiting Vietnam again, the author could not resist taking his fellow field gemologists again on a melo pearl quest.

For more details about Melo pearls, the author would like to invite you to read the Melo field expedition report published after last year expedition by the GIA Laboratory Bangkok: Concise Field Report Vol. 2, Part 1: Melos and their Pearls in Vietnam (May - Jun. 2009) by V. Pardieu

The Pearl and the Dragon Finally the author recommend to all people interested by Melo pearls the reading of
"The Pearl And The Dragon, A study of Vietnamese Pearls and a history of the Oriental Pearl Trade" edited by Derek J. Content.

This book has four parts written by four differents authors:
- "The dragon and the Pearl: Perfection and power" by Benjamin Zucker.
- "The mystery of Origins" by James Traub
- "Reflections on the Geography and Historyof the pearl trade in China, Vietnam, India and the Near East: by Derek J. Content
- "Orange pearls from the Melo Volutes (Marine gasteropods): A Gemological study of a unique Collection with Data from other Examinations by Kenneth Scarratt with contributions by George Bosshart, Nicholas DelRe, Emmanuel Fritsch, Alan Jobbins, John King and Benjamin Zucker.


(A beautiful jewelry design using a Melo Pearl with an interesting flame structure. The design associate the dragon and the pearl... The symbol for power associated with the beauty of the gem...)
Photo: V. Pardieu / GIA Laboratory Bangkok, 2010

If melo pearls are truly fascinating for their size, rarity and the beauty of their orange color associated with their delicate flame structure, for many young western gemologists nevertheless, there is in their fascination for melo pearls something completely different and often unexpected, something that show that gems can be appreciated for so many reasons as imagination has no limits: Here it is about a Japanese manga called "Dragon Ball Z" that was very popular at the beginning of the 1990's. Indeed, most people aged between 20 and 45 years old the authors knows are familiar with it: It is interesting as for many young western people (gemologist or not) their first interest about Asia and its cultures came in fact as they were fans of that manga:

Dragon Ball Z is a Japanese manga created by Akira Toriyama and inspired from the famous Chinese Folk novel "a Journey to the West": It is about the adventures of Son Goku, a mysterious young boy with a monkey tail, exploring the world with his friends and training in martial arts. During their adventures they discover the world, learn about themselves and try to gather seven mystical objects know as "Dragon Balls" in order to summon a wish-granting dragon.

During our expedition the association between Melo pearls and "Dragon Ball" came in fact very naturally: In Hanoi, at the beginning of the expedition, everybody was under the charm of the Vietnamese capital. We were visiting a melo pearl dealer in her cozy and traditional house in Old Hanoi. After few minutes, some sweet words and some delicious tea, she presented us a melo pearl she recently acquired. It was a beautiful and large orange pearl. On its surface, as it was moving in our hands we could see several golden bright points created by the reflections of the light bulbs illuminating the apartment: For most of us, who happen to have been fans of the manga "Dragon Ball" many years ago, the wonder we had in front of our eyes was not just melo pearl: It was a wonderful Dragon Ball!

Indeed from Dragon pearls to Dragon balls there was then another easy step: The rare melo pearls, often called: "Dragon pearls" are commonly associated with the Vietnamese Emperors, whose symbol is a Golden dragon very similar in design with the Dragon of the Manga.

Hunting for melo pearls from traditional and romantic Hanoi to the wonderful marine landscapes of Ha Long Bay, it was for most of the members of our team not only a gemological expedition, it was also an real initiation with the discovery of Vietnam and its traditional Asian culture. For young western gemologists there was obviously something reminding "a Journey to the West" or at least its modern version as a manga: "Dragon Ball". The manga was never very far away: First, the classic landscapes of Ha Long Bay (meaning the Declining Dragon Bay) were very similar to the design of the manga. Then most of us were surprised to learn that our destination: The Cat Ba Island, the largest island of Ha Long Bay, is inhabited by the "Cat Ba Langur" a rare endemic orange color monkey not without reminding young Sangoku with his monkey tail and the famous orange color of the melo pearls. In fact after a while and so many references here or there to the manga, most of us were wondering if Akira Toriyama, the creator of Dragon Ball had knowledge of Ha Long Bay and of melo pearls. The author is not such a fan of the manga to be able to answer that question properly but obviously there was so much in our expedition that was reminding us of the manga.

More seriously and gemologically correct, we were glad to see in Hanoi several interesting melo pearls and in Cat Ba Island we could meet again, as last year, several fishermen who happened to have some melo snails in their boat. We could then collect some additional information about the location and the way they fished them and of course Nick Sturman was also able to collect some interesting shells for his research.



("Kame-Haa Melo!"
... Pierre Hemon, a young French gemologist on an initiatic and somewhere also iconoclastic journey to Vietnam discovering Melo pearls and associating them with one of our classics: Japanese manga "Dragon Ball"!
Photo: V. Pardieu / GIA Laboratory Bangkok, 2010)

Part 2: A visit to "Vietnam Pearl Co Ltd" pearl farm in Ha Long Bay: After our expedition to Cat Ba Island we moved North, to the famous Halong Bay in order to visit the "Vietnam Pearl Co Ltd" pearl farm. We sailed on the Nang Tien junk belonging to the owner of the Viet-Y travel agency in Hanoi, who happened to be one of the author friends from the 1990's when the author was taking regularly groups of French tourists to visit Vietnam. As in January and May 2009, we visited one of the "Vietnam Pearl Co Ltd" pearl farming operations. With less than 1 million oysters it is, compared to most pearl farms in the rest of Asia, a small operation producing Akoya type pearls from Pinctada chemnitzii. During our visit we could witness there the grafting operation and the cleaning of the oysters performed on site in Ha Long Bay.



(A Vietnamese worker from "Vietnam Pearl Co. Ltd" working at the farm on Ha Long Bay.)
Photo: V. Pardieu / GIA Laboratory Bangkok, 2010

Part 3: A visit to "Taiheiyo Shinju Viet Nam Co Ltd" pearl farm in Bai Tu Long Bay: After returning in the main land we took the road to the north in direction of the Chinese border. We moved to Van Don Island, the largest island of the Bai Tu Long Bay. There we took the boat to the "Taiheiyo Shinju Viet Nam Co. Ltd", a joint Viet Nam and Japanese company. The cruise was again beautiful; as the Bai Tu Long Bay has the same incredible marine landscape as Ha Long Bay but as it is much more remote there is nearly no tourists there. After about one hour sailing we reached the "Taiheiyo Shinju Viet Nam" pearl farm located on the western side of a remote island. The operation is much larger than the "Vietnam Pearl" operation and more than 100 technicians were working there, most of them being Vietnamese women.



(View over the "Taiheiyo Shinju Viet Nam Co. Ltd" pearl farm located in Bai Tu Long Bay, as we can see with the two Vietnamese and Japanese flags, the farm is a joint venture between Vietnam and Japan)
Photo: V. Pardieu / GIA Laboratory Bangkok, 2010

Part 4: Return to Hanoi and visit of the "Vietnam Pearl Co Ltd" factory: We returned to Hanoi on April 14th in the evening. The following day we went to visit the "Vietnam Pearl Co Ltd" factory in Hanoi. There we could witness how pearls are prepared to be use in jewelry. In pearl farming as in gemstone mining, not all the production is naturally attractive enough to find a market; some treatments are thus required on the lower quality. These treatments can go typically from simple cleaning (in order to remove residues and odors) to more sophisticated techniques using gentle heating and prolonged exposure to light in order to bleach the pearls and produce whiter pearls. Some organic compounds are also commonly used in the Akoya type pearl industry after bleaching in order to produce a slight pink overtone or to get a better luster. These processes require a lot of experience and knowledge in order to be successful, they can be different from company to company and the details are usually kept secret. Nevertheless Mr. Thanh provided us some interesting explanations about the process used in his company on his pearls from Ha Long Bay and he allowed us to meet and speak with his technicians. It was a very interesting visit.


(Mr. Thanh presenting us some of his pearls from Ha Long Bay before and after treatment)
Photo: V. Pardieu / GIA Laboratory Bangkok, 2010

Finally after these few interesting days in North Vietnam Nick Sturman and Kham Vannaxay returned to Bangkok, while the author and the rest of his team continued their Vietnamese expedition to the ruby and spinel rich mountains of North Vietnam. Finally the author would like to thanks all his team for that wonderful expedition and also all the Vietnamese people who welcomed us and helped us and particularly Dr. Pham Van Long, from the "Vietnam National Gem and Gold Corporation" for his precious support and friendship.


The author would like now to invite you to visit the "Orange harmony: Vietnam and its melo pearls photo gallery, you will find there some high resolution photos of Vietnam, Ha Long Bay and their fascinating melo pearls...


All the best,

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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.