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 Tue Mar 19, 2024 2:32 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 32 posts ]  Go to page 1, 2, 3  Next
Author Message
 Post subject: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:09 am 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:26 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21600
Location: San Francisco
Tip #1 for GO members. Turn your sound OFF, .
I moved this post to a more appropriate category.
My first observation is that it is not a chameleon diamond.

The poor focus on the video isn't helping with identification.
Take regular, focused pics....is there a color change you've noticed?


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:34 am 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
I checked refraction value by my refractometer. Refraction value > 1.8


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:39 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21600
Location: San Francisco
Do you have a polariscope? Singly or doubly refractive?
Also, are you certain your refractometer (or your personal skills with the refractometer) are reliable?


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:45 am 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:49 am 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
Barbra Voltaire wrote:
Do you have a polariscope? Singly or doubly refractive?
Also, are you certain your refractometer (or your personal skills with the refractometer) are reliable?

I have no Polariscope and yes I have refractometer with many experiences for gem checking which has refraction value < 1.8.-------------but this gem refraction value can not be read due to that value > 1.8


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:53 am 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
It is yellowish green for sunlight and also lights. And it gets brownish red in dark environment.


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:54 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21600
Location: San Francisco
That video doesn't help.
Have you considered sphene, andradite garnet?


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:59 am 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
some valuable ganets may by > 1.8---------but color change in the dark is ,special quality of this gem.


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 12:10 pm 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
Is it Zircon gem ? Please answer


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:14 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21600
Location: San Francisco
Green zircon is green because of metamictization.
A metamict green zircon will have a refractive index below 1.8.


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:31 pm 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
Barbra Voltaire wrote:
Green zircon is green because of metamictization.
A metamict green zircon will have a refractive index below 1.8.

yes----Refractive index nω = 1.925–1.961
nε = 1.980–2.015, 1.75 when metamict
----from wikipedia


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:39 pm 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
natural zircon is actually the oldest mineral on Earth. ... This so-called metamict zircon is always green or brown in color. ... The green metamict zircon is quite rare and is prized by collectors.


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:41 pm 
Offline
Established Member

Joined: Fri Aug 09, 2019 11:18 pm
Posts: 22
Mostly, I guess that This gem is Chamillion Diamond.


Top
 Profile  
Reply with quote  
 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 4:28 pm 
Offline
Established Member

Joined: Mon May 20, 2019 3:47 pm
Posts: 36
If the value was 1.75 it would be close to a Diaspore or Zultanite gem.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 32 posts ]  Go to page 1, 2, 3  Next

All times are UTC - 4 hours


Who is online

Users browsing this forum: Google [Bot] 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