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 Mon Nov 18, 2019 7:31 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 14 posts ] 
Author Message
 Post subject: Synthetic topaz
PostPosted: Fri Dec 04, 2009 3:39 am 
Offline
Valued Contributor
User avatar

Joined: Thu Dec 03, 2009 3:31 am
Posts: 228
Location: Montreal, Quebec, Canada
Hi, i would like to know if any of you heard about synthetic topaz? Is it only red one because of it's rarity and high cost? I'm sitting for my diploma exam and one of my teacher told me (after correction of an pre-exam) that synthetic topaz doesn't exist, Gem-A and G.I.A never mentioned it. I know that considerable size of blue internally flawless (irradiated) topaz can be found for cheap and that synthesis wouldn't be worth it. Any and every answer would be greatly apreciated.

Thank you.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Fri Dec 04, 2009 3:58 am 
Offline
Gemology Online Veteran
User avatar

Joined: Fri Oct 30, 2009 9:19 pm
Posts: 591
Location: Las Vegas, NV
I don't have near the experience as other members, but my take is this:

As far as I know Synthetic Topaz doesn't exist and probably never will. There is a ton of Irradiated blue and coated (vapor deposition?) topaz on the market for cheap because Topaz is very plentiful, even in large sizes. I mean, I can go to Utah and literally collect pounds of facet-grade topaz in one weekend- for free! Some of the more desirable colors like the oranges and sherry-colored stones might be harder to come by (esp. large sizes) but colorless and extremely pale colors aren't too hard to find, and those are the ones treated. If I am wrong someone please correct me.

By the way... Welcome to the forums.

_________________
-Ryan Quantz, A.J.P. (GIA)
-Lapidary and Jewelry Artist
http://www.etsy.com/shop/RyanQuantzStudios


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Sat Dec 05, 2009 1:56 am 
Offline
Valued Contributor
User avatar

Joined: Thu Dec 03, 2009 3:31 am
Posts: 228
Location: Montreal, Quebec, Canada
Thank you for the answer and the welcoming.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Sat Dec 05, 2009 2:31 am 
Offline
Gemology Online Ɯbergoddess
User avatar

Joined: Mon Oct 06, 2008 6:13 pm
Posts: 5018
Location: Australia
Hi ya :smt006
Welcome to Go Gemsandjewellery.

_________________
Keep em comin!!!

Most of the fire on the wall has been put out :)


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Sun Dec 06, 2009 11:44 pm 
Offline
Valued Contributor
User avatar

Joined: Thu Dec 03, 2009 3:31 am
Posts: 228
Location: Montreal, Quebec, Canada
Thank you


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Wed May 09, 2012 5:58 am 
Offline
Established Member

Joined: Tue May 08, 2012 5:26 am
Posts: 27
Location: Sweden
The Institute of Experimental Mineralogy of Chernologovka, Russia published a report in 2000 where they succeded in growing gemquality topaz in a hydrothermal process. It was done on experimental basis and I do not know if there is any production going on anylonger.


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Sun May 13, 2012 8:47 am 
Offline
Moderator

Joined: Sun Oct 16, 2005 12:42 pm
Posts: 2849
Location: Ho Chi Minh City, Vietnam
Jan,

Is there an online copy of that report that we could read?


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Mon May 14, 2012 4:15 pm 
Offline
Established Member

Joined: Tue May 08, 2012 5:26 am
Posts: 27
Location: Sweden
It is some time since I saw this article and I could not find the original online but will keep searching for it.
In V. V. Bukanovs "Russian gemstones encyclopedia" there is a short notice on the synthesis of topaz carried out in 1976 wich is said not to be cost effective. Though he also mentiones that succesful production of imperial topaz had been carried out "reasonable from the commercial point of view." this was done with a hydrothermal method though no mention of when this was done. This book was published in 2006.


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Tue May 15, 2012 3:41 am 
Offline
Established Member

Joined: Tue May 08, 2012 5:26 am
Posts: 27
Location: Sweden
Here it is: http://144.206.159.178/ft/566/63591/1078857.pdf
[pdfview]http://144.206.159.178/ft/566/63591/1078857.pdf[/pdfview]


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Tue May 15, 2012 3:48 am 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7503
Location: Rome, Italy
Thank you very much Jan!! :D
ciao
alberto

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Sun May 20, 2012 4:27 am 
Offline
Established Member

Joined: Wed Nov 09, 2011 5:35 am
Posts: 36
maybe this article is of interest as well:

COMPOSITIONAL VARIATIONS IN SYNTHETIC TOPAZ
[pdfview]http://www.minsocam.org/ammin/AM57/AM57_169.pdf[/pdfview]


_____________________
Pinfire - Gems & Colloids

_________________
http://www.pinfire.de


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Sun Aug 05, 2012 3:46 am 
Offline
Valued Contributor
User avatar

Joined: Thu Dec 03, 2009 3:31 am
Posts: 228
Location: Montreal, Quebec, Canada
Hey,

thanks a lot Jan and Goldberg! That is some pretty good information. I missed that post.

_________________
http://JMKjewellers.ca


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Thu Sep 13, 2012 3:18 pm 
Offline
Established Member

Joined: Tue May 08, 2012 5:26 am
Posts: 27
Location: Sweden
here is a comercial jewelry site (in russian) http://tdsg.ru/page127.html that mentiones non-gemquality synthetic topaz as being something easily produced by a hydrothermal process. Even though they mention it as non-gemquality I do find it interresting that synthetic topaz is mentioned under these circumstances and I will not be surpriced when gemquality synthetic topaz turns up in the market.


Top
 Profile  
Reply with quote  
 Post subject: Re: Synthetic topaz
PostPosted: Thu Sep 13, 2012 6:42 pm 
Offline
Valued Contributor
User avatar

Joined: Wed Jun 18, 2008 12:01 am
Posts: 370
Location: Easley, South Carolina
Thanks for the articles, very interesting reading. I have saved them in my research folder.

John

_________________
John Atwell Rasmussen, Ph.D., AJP
Web: http://handmadeartists.com/shop/rasmussengems
Blog: http://rasmussengemsandjewelryllc.blogspot.com/


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 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