CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Wed Nov 13, 2019 8:35 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Fake Tanzanite in South Africa
PostPosted: Mon Aug 17, 2009 8:25 pm 
Offline
Valued Contributor
User avatar

Joined: Sat Aug 18, 2007 10:50 am
Posts: 387
Location: Dusseldorf, Germany
Passing this on. I have left the pictures quite big .

Dear Member,

EGL SA has brought under our attention that there are pieces of glass being sold as rough tanzanite.

You are urged to be careful. See attached pictures of some of the pieces.
Image
Image
Cheers, Hans

_________________
http://www.meevis.com
http://hansmeevis.blogspot.com


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue Aug 18, 2009 9:07 pm 
Offline
Gemology Online Übergoddess

Joined: Tue Nov 06, 2007 3:16 am
Posts: 3170
:lol: thanks for sharing the news with us, hans, on the new glass tanzanite rough.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Aug 19, 2009 7:13 am 
Offline
Platinum Member

Joined: Tue Jun 03, 2008 4:40 pm
Posts: 2667
Location: South Dakota
looks to be etched with acid..

_________________
MrAmethystguy ~ Some jokes just fluorite over my head!


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Aug 19, 2009 8:55 am 
Offline
Valued Contributor
User avatar

Joined: Sat Aug 18, 2007 10:50 am
Posts: 387
Location: Dusseldorf, Germany
Or maby fired with crushed glass just to fusing point?

_________________
http://www.meevis.com
http://hansmeevis.blogspot.com


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Aug 19, 2009 9:15 am 
Offline
Platinum Member

Joined: Tue Jun 03, 2008 4:40 pm
Posts: 2667
Location: South Dakota
man..what folks will do to make a quick buck

_________________
MrAmethystguy ~ Some jokes just fluorite over my head!


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Aug 19, 2009 11:45 am 
Offline
Gemology Online Übergod
User avatar

Joined: Mon Oct 17, 2005 2:39 pm
Posts: 3530
Location: San Francisco Bay Area, CA
What I find curious is that the amount of ingenuity and industriousness shown in some of these "frauds" is such that if an equal amount of effort were applied to a legitimate business, they would probably succeed... and legally. :cry:


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Sun Aug 23, 2009 4:34 am 
Offline
Site Admin
User avatar

Joined: Fri Apr 17, 2009 3:53 pm
Posts: 2049
Location: Sweden
This is why it is so neat to have your traveling kit with polariscope, "penlight", loupe etc, in the backpack when travelling :D

_________________
_____________
Conny Forsberg


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Sun Dec 20, 2009 11:10 am 
Offline
Gold Member

Joined: Sun Jun 28, 2009 9:56 am
Posts: 1224
besides glass, synthetic forsterite and iolite are also beeing passed off as tanzanite


Top
 Profile  
Reply with quote  
 Post subject: Re: Fake Tanzanite in South Africa
PostPosted: Sun Oct 24, 2010 4:33 pm 
Offline
Moderator: Lapidary Arts and Tools
User avatar

Joined: Tue Jun 12, 2007 6:41 pm
Posts: 5518
Location: Massachusetts, USA
That picture reeks of cobalt. I can smell it through the monitor. :P


Top
 Profile  
Reply with quote  
 Post subject: Re: Fake Tanzanite in South Africa
PostPosted: Mon Oct 25, 2010 3:27 pm 
Gearloose wrote:
That picture reeks of cobalt. I can smell it through the monitor. :P

But it's *such* a nice colour! :lol: .

I have a lovely example, of about 4.5 ct, quite nicely rectangular cut that I bought as part of a small 'teaching' set of imitation, synthetic and natural faceted stones. Give me a couple of days and I'll get it under the 'scope and and if there are useful 'tell-tales' I'll postthe pics here. Come to that, if I can spot no visual tell-tales, that might be worth putting up a couple of pics for general comment also :shock: :D

Other inspections get it easy enough though. RI is wonky for the main look-alikes apart, maybe, from Hauyne nsub](y)[/sub] = 1.514; ADR and UV fluorescence is suspect at least for blue spinel, corundum and even Hauyne.

Still pretty though (until I drop it on a tiled floor.....).


Top
  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock