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 Fri Dec 06, 2019 2:04 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: Dark blue Cambodian Sapphire
PostPosted: Tue May 28, 2019 11:04 pm 
Offline
New to the Forum or The Quiet Type

Joined: Mon Jan 12, 2015 2:55 am
Posts: 3
Hi all,

I'd like to ask your opinion about these dark blue sapphires from Cambodia and what you would do with it. Is there any heat treatment that might lighten them up a bit? The stones show a strong pleochroismus effect.
Thanks!


Attachments:
DSC_0092.JPG
DSC_0092.JPG [ 983.55 KiB | Viewed 414 times ]
2.JPG
2.JPG [ 3.94 MiB | Viewed 414 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Dark blue Cambodian Sapphire
PostPosted: Wed May 29, 2019 9:15 am 
Offline
Gemology Online Veteran

Joined: Thu May 12, 2016 2:18 am
Posts: 658
Yes, they can be low temperature heat treated in an oxidizing environment to lighten the color.

Here is a new article on the process from GIA:

https://www.gia.edu/gia-news-research/o ... -sapphires


Top
 Profile  
Reply with quote  
 Post subject: Re: Dark blue Cambodian Sapphire
PostPosted: Fri May 31, 2019 9:06 pm 
Offline
New to the Forum or The Quiet Type

Joined: Mon Jan 12, 2015 2:55 am
Posts: 3
Thanks for the link! That's an interesting article =D> =D>


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 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