Latest Articles

 This page lists articles as they are made live or updated.

29th Feb 2020
Riccardo ModanesiProf. Dr. Hermann Bank - In Memoriam0 Comments

24th Jul 2019
Riccardo Modanesi7th European Gemmological Symposiun0 Comments

31st May 2019
Famous Zia uddinAbout Gems Facet Intl0 Comments

25th Jan 2019
Thomas PfneislCheap TV jewellery - a polemic0 Comments
Thomas PfneislEthically sourced gems0 Comments
Thomas PfneislGem scams Part 1 - India A comparison of techniques0 Comments
Thomas PfneislGem scams Part 2 - Bangkok A comparison of techniques0 Comments
Thomas PfneislGem scams Part 3 - blame yourself0 Comments
Thomas PfneislGem scams – the German version0 Comments
Thomas PfneislDupery at online auctions0 Comments
Thomas PfneislGem scams Part 4 - India0 Comments
Thomas PfneislThe shocking truth0 Comments

18th Sep 2017
Jolyon & Katya RalphGemdat - the future!0 Comments

20th Apr 2017
Ray HillCavansite a new gem material0 Comments

23rd May 2016
Patricia BradyDon’t Want To Be Cheated While BuyingBlue Sapphire Stone? Consider These 4 Thing0 CommentsNorth Carolina, USA

25th Jan 2014
Jolyon & Katya RalphGemdat at Tucson 20140 Comments

31st Aug 2013
Riccardo Modanesi5th European Gemmological Symposium0 Comments

15th May 2013
Jolyon & Katya RalphThe ICA Congress 2013, Changsha, China0 Comments

5th May 2013
Jolyon & Katya RalphChangsha - ICA Congress and CGMS Show0 Comments

29th Oct 2012
Jolyon & Katya RalphMunich Show 20120 Comments

20th Oct 2012
Jolyon & Katya RalphWhat's new in Gemdat.org0 Comments

30th Sep 2012
Jolyon & Katya RalphRobertson: Precious Stone & Gems of Scotland (1814)0 Comments
Jolyon & Katya RalphKluge's Gem Classification of 18600 Comments

10th Sep 2012
Jolyon & Katya RalphQuick visit to IJL Gemshow, London, September 20120 Comments

Page 1 of 1
Copyright © Jolyon & Katya Ralph 1993-2021. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . is an online information resource dedicated to providing free gemmological information to all.