GIA laboratory Bangkok's special issue about rubies from Mozambique

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GIA Laboratory, Bangkok

10th Floor U-Chu-Liang Building
968 Rama IV Road Silom Bangrak Bangkok
10500 Thailand

Tel: (66) 2 632 4090
Fax: (66) 2 632 4096

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Gemology: Special issue on "Rubies from Mozambique"

This page contains reports indicating the status of research projects on Mozambique ruby that are still ongoing within GIA Laboratory Bangkok:

Rubies from Mozambique started to be commonly seen in the market in Thailand at the end of 2008 after the discovery of a new deposit in the Niassa province of Northern Mozambique in September 2008. During spring 2009 a second important deposit was also discovered near the city of Montepuez in the neighboring Cabo Delgado province. Rapidly mining increased and rubies from Mozambique (unheated, heated or lead glass filled) became very common in international gem trading centers like Thailand but also in the USA and the rest of the world.

Gemologists at GIA started immediately to study this new material as soon as it became available. In order to confirm the origin of these gems and collect more gemological data about them several expeditions to the different ruby mining areas in Mozambique were successfully lead by a GIA field gemologist in autumn 2009. The reference samples collected on site were integrated into GIA reference collection in order for GIA gemologists to study them and continue to provide to GIA customers the best service about origin determination of ruby and sapphire...

Read more details downloading the following pdfs and Gem & Gemology publications:

“Low temperature” heat treatment of Mozambique ruby - Results Report
By V. Pardieu, S. Saeseaw, S. Detroyat, V. Raynaud, S. Sangsawong, T. Bhusrisom, S. Engniwat and J. Muyal.
(Released April 16th, 2015) In January 2015 GIA became aware of some concern that Mozambique rubies were being heated...


Mozambique: A Ruby Discovery for the 21st Century
By T. Hsu, A. Lucas and V. Pardieu.
(Released March 12th, 2014) In September 2014, GIA researchers Tao Hsu, Vincent Pardieu, and Andrew Lucas, visited the Montepuez ruby deposit. They could witness the evolution of this major deposit.


Gemfields Inaugural Rough Ruby Auction in Singapore
By A. Lucas and V. Pardieu.
(Released July 17th, 2014) Gemfields held its first Mozambique rough ruby auction in Singapore, where buyers from around the world came to bid on parcels...


Rubies from the Montepuez area (Mozambique)
By V. Pardieu, S. Sangsawong, J. Muyal, B. Chauviré, L. Massi and N. Sturman
(Released Oct 15th, 2013) The first objective of this study is to complete the work begun in previous GIA Publications on the new deposits in Northern Mozambique..

Update on ruby mining in Northerm Mozambique
By V. Pardieu, B. Chauviré
(Published in Gems & Gemology, vol. 48, No 4, (Winter 2012),Gem News International, pp. 309-311)

FAPFH/GFF Treated Ruby from Mozambique, a preliminary report
By V. Pardieu, N. Sturman, S. Saesaew, G. Du Toit and K. Thirangoon
(Released May 11th, 2010) After the discovery of the Montepuez ruby mining area in Mozambique, during spring 2009, within few months, gemologists at the GIA Laboratory Bangkok started..


Expedition report to ruby mining sites in Northern Mozambique 
By V. Pardieu, S. Jacquat, J.B. Senoble, L.P. Bryl, R.W. Hughes and M. Smith
(Released December 16th, last edited December 23rd, 2009) This expedition report presents the first description of the ruby mining areas in Mozambique (Niassa and Cabo Delgado provinces)..

Update on rubies from Mozambique
By V. Pardieu and P. Lomthong
(Published in Gems & Gemology, vol. 45, No 4, (Winter 2009), Gem News International, pp. 302-303)"
Preliminary observations on new rubies from Mozambique
By S. McClure and J. Koivula
(Published in Gems & Gemology, vol. 45, No 3, (Autumn 2009), Gem News International, pp. 224-225)

Rubies reportedly from Niassa Province, Mozambique
By V. Pardieu, J. Thanachakaphad
(Released: March 22nd, last edited: April 16th 2009) During the past few months, new rubies reported as “Mozambique” appeared in the market in Bangkok and Chanthaburi...


About gemological research at GIA:

For decades, GIA has been on the cutting edge of gemological research, analyzing data on gems and their characteristics. This effort becomes more challenging each year, as new gem sources emerge and new treatment processes and synthetic materials come onto the market. And if artificially enhanced gems and synthetics were left undetected, every gem and jewelry purchase would be a risk. GIA is dedicated to providing consumers the knowledge they need, and that’s why research is at the very core of GIA’s non-profit mission.

About origin determination of gemstones at GIA:

Most agree that geographic origin should not be used as a quality factor, as even the most renowned gem mining areas produce many low quality gems. Nevertheless like in art, for gems as for many other luxury items, geographic origin affects market value. It means that gems of equivalent beauty and quality but which were mined in different geographical areas might have a different market value based on their origin: Typically gems originating from famous and romantic traditional mining areas may have a higher market value compared to similar gems mined from a less glamorous and famous source. Besides romantic and marketing aspects, recently new legal and also ethical concerns appeared in several consuming markets. Thus GIA is offering origin determination services for several types of gemstones including ruby and sapphire but also emeralds and tourmaline (see services). To provide the best possible service, research on origin determination of gemstones is nowadays a very important part of gemological research at GIA. In December 2008, the GIA laboratory Bangkok was the first gemological laboratory to create a field gemology program. Its purpose is to collect reference samples on site at the source using GIA protocols in order to build and update the best origin related gemstone reference collection for GIA researchers to work on

Note: Comments on the reports and their direction are warmly welcomed as are offers of collaboration. Please contact: stating the name of the project and name(s) of the author(s).