February 2-4—TUCSON, ARIZONA: Show and sale; United States Faceters Guild; Old Pueblo Lapidary Club, Thu. 10-5, Fri. 10-5, Sat. 10-9; A great event to learn Faceting, or hone your skills, presentations on dopping, heating, using software, stone evaluation, machine demonstration, door prizes, stone competition, and the Faceters Hob Nob to finish it off Saturday night
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Tue Jan 31, 2023 9:53 pm

All times are UTC - 4 hours

Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: Gold plated tungsten core metal concern
PostPosted: Thu Sep 20, 2012 4:44 pm 
Valued Contributor
User avatar

Joined: Sun Jul 22, 2007 5:58 pm
Posts: 294
Location: California desert
On a numismatic forum there was a post of a URL that showed a jeweler dissecting a gold plated tungsten core bar.


Since tungsten has a high density 19.25 compared to gold 19.30 , it is difficult to differentiate by this characteristic. Since Tungsten has such a high melting temperature, it is usually used as a powdered chemical precipitate, rather than melted and molded. A link was given to that forum of Chinese produced coins that have tungsten cores. I happened to notice that jewelry was also listed.


and of course they provide this phrase " Here we declare: Please do not use our tungsten heavy alloy fake gold products for any illegal purpose."

There seems to be a waveform detector similar to an ultrascan unit that can determine a difference from the wave passing through a solid metal and through one mainly metal particles held together by an "adhesive" soft metal or epoxy.

I don't know how many use such for their work from China, but it seems this will escalate, especially from Ebay, CL, and Local auctions.


Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 4 hours

Who is online

Users browsing this forum: No registered users and 1 guest

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