Dec.20 to 22:SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center; Fri. 12-6, Sat. 10-6, Sun. 10-5;
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Mon Dec 09, 2019 9:02 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Heat treatment of Apatite
PostPosted: Sat Sep 23, 2006 5:33 pm 
Offline
Gemology Online Übergod
User avatar

Joined: Tue Aug 01, 2006 3:24 am
Posts: 4997
Location: McDonough GA
Is Apatite routinely heat treated to bring out the Paraiba type colors?

Jason


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Sun Sep 24, 2006 12:54 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19943
Location: San Francisco
Apatite occurs naturally in several fabulous colors, without undergoing any treatments. The GIA, in their Gem Reference Guide, lists: NO COMMERCIAL TREATMENTS KNOWN:
Image

Recently, I have noticed several companies Like "Jewelry TV" and the "Home Shopping Network" indicating that their apatite has been heat treated.
As far back as the Summer of 1990, it was reported that untreated apatite found in Madagascar had a strong resemblence to Paraiba tourmaline. (G&G 1991 & G&G 1993) It was also reproted that it was not extensively cut because it was extremely sensitive to thermal shock. The heat from the cutting wheels often caused it to shatter!
Image
Anyone else heard additional info?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Sun Sep 24, 2006 1:41 pm 
Offline
Gemology Online Übergod
User avatar

Joined: Tue Aug 01, 2006 3:24 am
Posts: 4997
Location: McDonough GA
Thanks Barbra.

The reason I asked is because I was checking out the Apatite at AJS gems and nearly all of their stock is noted as having been heated. I had not heard of this treatment being applied to Apatite before.

Jason


Top
 Profile  
Reply with quote  
 Post subject: Re: Heat treatment of Apatite
PostPosted: Thu Nov 08, 2012 6:03 am 
Offline
Valued Contributor

Joined: Fri Feb 08, 2008 5:37 am
Posts: 194
Have you never seen these color?
http://www.thegemtrader.com/Nov12ApatitePage.htm
Image


Top
 Profile  
Reply with quote  
 Post subject: Re: Heat treatment of Apatite
PostPosted: Thu Nov 08, 2012 11:14 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19943
Location: San Francisco
Actually I have heard over the years that blue apatite is indeed the result of treatment. I don't know the specifics.
Anyone?


Top
 Profile  
Reply with quote  
 Post subject: Re: Heat treatment of Apatite
PostPosted: Thu Nov 08, 2012 12:39 pm 
Offline
Platinum Member
User avatar

Joined: Fri Feb 24, 2006 1:20 am
Posts: 2742
Location: Southern California, U.S.A.
I researched this 6-7 years ago and found many references to heat treatment of Mada apatite. I list it as heated on my website.

This article was one I found: http://www.jckonline.com/article/288597-Apatite.php

_________________
Rick Martin

www.artcutgems.com


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 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