December 14-16—SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center, 1895 Camino del Rio S; 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 Wed Dec 12, 2018 7:52 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: Spectrum
PostPosted: Sat Sep 09, 2017 11:41 am 
Offline
New to the Forum or The Quiet Type

Joined: Sat Aug 19, 2017 3:18 am
Posts: 2
Hello. I have a question about Spectrum.

I have a taking a Gem Identification course.
For example, Do we see always the band at 437.5 for Non-Chrome Jadeite and Jadeite?
Or, are we not going to see the band for some natural Jadeite?

I think I am not be able to use the spectroscope well yet. So, I am thinking that I am not seeing the band.
But the instructor in the classroom said we don't see the band always...... Is that true?


Top
 Profile  
Reply with quote  
 Post subject: Re: Spectrum
PostPosted: Wed Dec 27, 2017 10:33 pm 
Offline
Gemology Online Veteran

Joined: Wed Jan 14, 2015 3:52 pm
Posts: 575
Location: N Dakota
Kojf
I'm also in gem ID, the spectroscope is a headache for me as well. I believe if you use a fiber optic light that you can vary the intensity you will see better results.

_________________
Dan


Top
 Profile  
Reply with quote  
 Post subject: Re: Spectrum
PostPosted: Thu Dec 28, 2017 10:50 pm 
Offline
Valued Contributor

Joined: Sun Mar 11, 2007 10:03 pm
Posts: 230
Location: San Diego
The 437 band will not always be visible in each example of untreated Jadeite, especially if you are using a mini maglight or similar light source.

However, sometimes it is more important to determine what is not visible rather than what is when performing your identifications. It is the absence of absorption in the red area of the spectrum (indicative of dye treatment) which can allow you to make the separation in many cases.

_________________
Paul Mattlin
Manager, Gemology Distance Education

* My posts do not reflect the opinions or policies of my employer


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 0 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