January 24 Through February 4—TUCSON, ARIZONA: Annual show
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Thu Mar 28, 2024 4:10 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 20 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 3:53 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
Is it genuine lead- glass filled material? Why not?

Glass filled corundum is an artificial, worthless product, IMO.
https://www.gia.edu/doc/SP06A2.pdf


I've spent up to $5 on a cabochon-cut lead glass composite.


Top
 Profile  
Reply with quote  
 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 7:36 pm 
Offline
Gemology Online Veteran

Joined: Thu Mar 19, 2015 9:55 am
Posts: 543
The problem to be solved was that some ruby rough (particularly Madagascar) was seriously fractured or not very transparent. Heating to a high temperature and slowly cooling often solved the transparency problem but fractures were more serious, eventually someone worked out that hearing with ruby coloured lead glass would fill the fractures and give the stone a much greater transparency and clarity. Both treatments are acceptable PROVIDED they are disclosed and the price reflects the fact that they have been treated. Personally I would buy a ruby that had been heat treated, but not one that had been glass filled. I just don't know how the filling will react to wear over the likely life of a piece of jewellery.


Top
 Profile  
Reply with quote  
 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 7:44 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
No, lead-glass filled corundum can not be termed ruby.


Top
 Profile  
Reply with quote  
 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 7:53 pm 
Offline
Gemology Online Veteran

Joined: Thu Mar 19, 2015 9:55 am
Posts: 543
Hi Barbra, very interesting and informative article, thank you. Confirms my prejudice against glass filled stones, no matter how nice they look or how cheap they are!


Top
 Profile  
Reply with quote  
 Post subject: Re: Help identifying please
PostPosted: Sat Sep 22, 2018 1:53 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
You are very welcome!


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 20 posts ]  Go to page Previous  1, 2

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 11 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