New Mineral Named After GIA’s John Koivula
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Tue Oct 15, 2019 10:04 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 66 posts ]  Go to page Previous  1, 2, 3, 4, 5
Author Message
 Post subject: Re: GemmoRaman
PostPosted: Tue Nov 11, 2014 5:41 pm 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7499
Location: Rome, Italy
You asked for the possibility of scanning inclusions inside gemstones, that is something it can be done only by using Confocal MicroRaman units, GemmoRaman is not a confocal unit so its not possible to scan inclusions. 2 examples of units used for that task are this one: http://www.thermoscientific.com/content ... scope.html which i use on daily bases and it costs around 90-100.000 $ depending on the configuration and this one: http://www.renishaw.com/en/invia-confoc ... cope--6260 which can cost even more than 230.000 $ if equipped with multiple laser setup.
hope this will clarify the situation a bit. ;-)

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject: Re: GemmoRaman
PostPosted: Wed Nov 12, 2014 4:23 am 
Offline
Site Admin
User avatar

Joined: Fri Apr 17, 2009 3:53 pm
Posts: 2049
Location: Sweden
A confocal micro Raman unit is costing from USD 70K to 250K. The price for GemmoRaman-532 can be found at their website.

_________________
_____________
Conny Forsberg


Top
 Profile  
Reply with quote  
 Post subject: Re: GemmoRaman
PostPosted: Sun Nov 30, 2014 4:25 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19851
Location: San Francisco
Question.
Treated chalcedony to make it black. (often referred to as black onyx)
Is this treatment detectable with the Gemmoraman?
In an article in G&G, 2003, Fall, there was a confusion about whether some black chalcedony was treated, or I should say a confusion as to HOW to prove it.
Quote:
To support this conclusion, we analyzed the material with the Raman spectrometer. The presence of two distinct peaks, one at 1600 cm−1 and the other centered at 461 cm−1, identified the black material as chalcedony and indicated the presence of a carbonized compound (sugar). In addition, infrared spectroscopy showed two peaks at approximately 2235 and 2133 cm−1, which our research has found indicate that the color is the result of treatment by sugar and acid (and/or heat). This material is typically known in the trade as black onyx.


Is this a conclusion you have confirmed with the GemmoRaman?


Top
 Profile  
Reply with quote  
 Post subject: Re: GemmoRaman
PostPosted: Mon Dec 01, 2014 9:34 am 
Offline
Valued Contributor

Joined: Wed Oct 22, 2008 5:00 am
Posts: 344
Location: Finland
Quote:
Is this a conclusion you have confirmed with the GemmoRaman?


We have seen the 1600 cm-1 peak in treated black chalcedony, but whether it shows up in all the treated samples or not is unclear at this point. To clarify the editing of G&G- article: 461 cm-1 peak only indicates the sample is quartz. Chalcedony has an additional smaller peak or shoulder at 501 cm-1 (moganite) which the article does not mention. The 1600 cm-1- peak indicates the presence of carbonized sugar.

_________________
GemmoRaman GemmoFtir GemmoSphere


Top
 Profile  
Reply with quote  
 Post subject: Re: GemmoRaman
PostPosted: Sun Dec 21, 2014 12:08 am 
Offline
Valued Contributor

Joined: Fri Nov 07, 2014 5:21 pm
Posts: 418
Location: Morden, MB, Canada
Is it possible to use liquid nitrogen to cool the sample with this device?

_________________
Premium wedding gold rings&bands https://www.etsy.com/shop/energyosjewelry


Top
 Profile  
Reply with quote  
 Post subject: Re: GemmoRaman
PostPosted: Sun Dec 21, 2014 5:06 am 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7499
Location: Rome, Italy
hi

energyos wrote:
Is it possible to use liquid nitrogen to cool the sample with this device?


yes, by using this Kit: http://www.gemmoraman.com/Products/LNKit.aspx

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 66 posts ]  Go to page Previous  1, 2, 3, 4, 5

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 1 guest


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