• ICGL Newsletter Summer 2016: Diamond CVD Synthetic and Treatment

ICGL Newsletter Summer 2016

New issue of ICGL newsletter is released on 27th August 2016.
PDF version can be downloaded from next link.
ICGLNewsLetter-2016 Summer(19.8Mb)

The contents:

Irradiation May Cause Synthetic Melee Diamonds to behave like natural diamonds
Jayshree Panjikar and Aatish Panjikar
PANGEMTECH- Panjikar Gem Research & Tech Institute,

LAB NOTE: Fracture-filled diamonds
An example from the daily work in gem-testing laboratory
Elisabeth Strack
Gemmologisches Institut Hamburg, Germany

Nano-coated Pink Diamond
A Study on Surface Analysis Technology and Coating Materials
Seung Kwon Lee and Kook-Whee Kwak
Wooshin Gemological Institute of Korea, Korea

Coated Diamond to imitate Pink Diamond
By Tay Thye Sun & Loke Hui Ying
Far East Gemological Laboratory, Singapore

ICGL Newsletter Spring 2016

New issue of ICGL newsletter is released on 22nd April 2016.
PDF version can be downloaded from next link.
ICGLNewsLetter-2016SP (4.8Mb)

The contents:

Blood Red Rubies from Madagascar
Ridchard W. Hughes, Wimon Monorotkul & E. Billie Hughes
Lotus Gemology

Pigeon-Blood Type Red Rubies
Jayshree Panjikar
Pangem Tesing Labolatory

Tialite (Al2TiO5) may cause Asterism
Jayshree Panjikar and Aartish Panjikar
Pangem Tech- Panjlkar Gem Research & Tech Institute

 

ICGL Newsletter Winter 2015

New issue of ICGL newsletter is released on 30th January 2016.
PDF version can be downloaded from next link.
ICGLNewsLetter-2015WN(10.5Mb)

The contents:

Testing and screening of melee-sized nearcolorless HPHT synthetic diamonds
using a multi-spectral induced luminescence imaging system (GV5000) in China
Taijin Lu, Yan Lan, Rong Liang, Congshen Zhang
National Gemstone Testing Center (NGTC)

Identification of Dye-treated Golden South Sea Pearls
Kook-Whee Kwak, Jong-Kyu Lee, and Eun-Ah Jeong
Wooshin Gemological Institute of Korea

Treated blue diamond
Tay Thye Sun & Loke Hui Ying
Far East Gem Lab, Singapore

Symposium on Diamond: “Advances in Technology & Detection”

Introducing ICGL Member from Australia: Mr Bill Sechos

ICGL Newsletter Fall 2015

New issue of ICGL newsletter is released on 30th October 2015.
PDF version can be downloaded from next link.
ICGLNewsLetter-2015FA (23Mb)

The contents:

HPHT Grown Near-Octahedral Shape Synthetic Small Diamond
using Even Temperature Method

By Joe C.C. Yuan
Taiwan Gemmological Institute, Taipei, Taiwan

Treated amber beads
By Tay Thye Sun & Loke Hui Ying
Far East  Gemological Laboratory, Singapore

Amber collection
By Jayshree Panjikar
Pangem Testing Laboratory, Pune, India

AG&J Trade Alert: Proposed Solution to Detecting Fraudulent Replicas of Certified Diamonds
By Dusan Simic
Analytical Gemology and Jewelry, New York, USA

ICGL Newsletter Summer 2015

New issue of ICGL newsletter is released on 10th June 2015.
PDF version can be downloaded from next link.
ICGLNewsLetter-2015SU (8.6Mb)

The contents:

Tourmaline from Afghanistan
By Jayshree Panjikar
Pangem Testing Laboratory, Pune, India

Introducing Regular Member 008
Mr. Walter Leite
Realgems LAB

CompositeEmearld

ICGL Newsletter Spring 2015

New issue of ICGL newsletter is released on 10th March 2015.
PDF version can be downloaded from next link.
ICGLNewsLetter-2015SP (19.9Mb)

The contents:

New type of emerald composite
By Jayshree Panjikar
Pangem Testing Laboratory, Pune, India

Unusual hydrothermal synthetic emerald with filled fractures
By Hyunmin Choi, Sunki Kim and Young-chool Kim
Hanmi Gemological Institute & Laboratory (GIG), Seoul, Korea

Soude-emeralds -Good imitations in modern times-
By TayThye Sun and Loke Hui Ying
Far East Gemological Laboratory, Singapore

Impregnated Russian hydrothermal synthetic emerald
By Kook-Whee Kwak and Eun-Ah Jeong
Wooshin Gemological Institute of Korea, Seoul, Korea

Introducing Regular Member 007
Mr. Travis Lejman
Gemological Appraisal Laboratory of America, Inc.

Members of ICGL met at Chiang Mai, Thailand on 7th December 2014

 

ICGL Newsletter Fall 2014: Blue sapphire and its treatment

ICGL Newsletter Fall 2014

New issue of ICGL newsletter is released on 21st November 2014.
PDF version can be downloaded from next link.
ICGLNewsLetter-2014FA (15.4Mb)

The contents:

Appearance of new treatment method on sapphire using HPHT apparatus
By Hyun-min Choi, Sun-ki Kim and Young-chool Kim
Hanmi Gemological Institute & Laboratory (GIG), Seoul, Korea

“BLUE SILK” Color change-like effect in pink sapphire from Batakundi
By Masaki Furuya
Japan Germany Gemmological laboratory, Kofu, Japan

Cobalt-doped glass-filled treated blue sapphire
By TayThye Sun and Loke Hui Ying
Far East Gemological Laboratory, Singapore

Punsiri type heat treatment of sapphire done in Khambat, India
By Jayshree Panjikar
Pangem Testing Laboratory, Pune, India

Current Trends within the Thai Gemstone Industry
Dietmar Schwarz and Yadhunath Ramakrishnan
Asian Institute of Gemological Sciences Thailand

Interview with Dominic Moc: Founding Member

ICGL Newsletter Summer 2014

New issue of ICGL newsletter is released on 23rd August 2014.
PDF version can be downloaded from next link.
ICGLNewsLetter-2014SU (1.05Mb)

 

The contents;

Identification of CVD Synthetic Diamonds
By Kook-WheeKwak, Wooshin Gemological Institute of Korea (WGK)

Recent CVD diamonds tested at Pangem Testing Laboratory
By Jayshree Panjikar, Pangem Testing Laboratory, Pune, India

Treated Black Diamond Earring
By Tay Thye Sun & Loke Hui Ying, Far East Gemological Laboratory, Singapore

A book review “Colour of Paradise” by Kris Lane, 2010
By Elisabeth Strack, Gemmologisches Institut Hamburg, Germany

Lab notes: 10 carats Asteriated Diamond and etc.

Interview with Masaki Furuya: Founding Member

 

ICGL Newsletter Spring 2014

New issue of ICGL newsletter is released on 1st July 2014.
PDF version can be downloaded from next link.
ICGLNewsLetter-2014SP (1.05Mb)

 

The contents;

Oiling of Star Rubies from Burma
By Tay Thye Sun & Loke Hui Ying, Far East Gemological Laboratory, Singapore

Ancient Roman Bead-Makers of Arikamedu, South India
By Jayshree Panjikar, Pangem Testing Laboratory, Pune, India

Routine Findings in the Gemmological Laboratory Black Synthetic Moissanite Sold as Black Diamond
By Elisabeth Strack, Gemmologisches Institut Hamburg, Germany

A book review “Colour of Paradise” by Kris Lane, 2010
By Elisabeth Strack, Gemmologisches Institut Hamburg, Germany

Innovative Idea of Teaching Gemmology
By Sunki Kim, Hanmi Laboratory, Korea

Interview with Elisabeth Strack: Founding Member

 

ICGL Newsletter Winter 2014

New issue of ICGL newsletter is released on 12th March 2014.

PDF version can be downloaded from next link.

ICGLNewsLetter-2014WN (11.2Mb)

 

The contents;

Non-resin type synthetic opal by Kyocera

By Masaki Furuya(1), Masanobu and Satoshi Miyazaki(2)

(1) Japan Germany Gemmological Laboratory, Kofu, Japan
(2) Nagomiishi Co, Ltd. Osaka, Japan

Collector’s Gem Petalite

By Jayshree Panjikar,Pangem Testing Laboratory,Pune, India

The Cheapside Hoard: London’s Lost Jewels
Exhibition at the Museum of London 11 October, 2013 to 27 April 2014

By Elisabeth Strack, Gemmologisches Institut Hamburg, Germany

Interview with Branko Deljanin: Former Founding Member