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PostPosted: Wed Oct 07, 2009 1:54 am 
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Here is an article by a manufacturer of FTIR instruments on detecting water in Rubies and Sapphires as an indicator of heat and Be treatment.

Notice the beam condenser accessory. You get to buy that a la cart after you have bought the FTIR spectrometer. That puppy is not cheap.

And there are other accessories you would want to have such as Diffuse Reflectance, Specular Reflectance and ATR .

Also FTIR spectrometers have different detectors. In this article they used an HCT detector. That stands for mercury cadmium telluride. This is a real nice one but it adds alot of cost to the instrument too and needs liquid nitrogen to operate.

They also used a "KBr" beam splitter. That's Postassium Bromide a material like table salt. Has to be kept dry. Any exposure to moisture including humid air,ruins it.

Perhaps any of our list members who work at GIA,, who seemed to have been involved with this article,, can tell us whether GIA actually owns the instrument or whether it was a demo or a borrow.

The company that made the instrument ThermoFisher Nicolet have made their instruments fairly user friendly in comparison with older instruments.


Last edited by G4Lab on Wed Oct 07, 2009 12:19 pm, edited 1 time in total.

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PostPosted: Wed Oct 07, 2009 5:23 am 
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hey Gene,
the link doesn't work for me :(
ciao
albé

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PostPosted: Wed Oct 07, 2009 12:21 pm 
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Should work now.
Sorry there were some .... in the link I didn't notice and had to go back and
click on properties and recopy it. :oops:


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PostPosted: Wed Oct 07, 2009 12:52 pm 
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Interesting but......
from what i read the FTIR can detect the possible treatment by the lack of the 3300 cm peak only. This means , if i understand well, a lack of water due to high temp tratment, so, to recap, the FTIR can detect an exposition to high temp NOT the presence of Beryllium.
If the stone was simply heated at unusual high temp?
Likely i would get a false pos to be treatment, no?
however it's an impressive gear, i like THERMO machines.. 8)
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alberto

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Last edited by Alberto on Wed Oct 07, 2009 1:08 pm, edited 1 time in total.

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PostPosted: Wed Oct 07, 2009 1:08 pm 
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You are correct. It does not detect Be, merely the absence of an H20 peak.
So a long course of cooking could make that go away even if it was not Be treated. Although if it has "only" been heat treated I don't see much difference as far as valuation. Since it is now different than when it came out of the ground. But not being in the business there may be more distinctions than that.

These instruments are nice but they cost as much as a Mercedes.


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PostPosted: Wed Oct 07, 2009 1:10 pm 
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G4Lab wrote:
But not being in the business there may be more distinctions than that.


this for sure Massa, try to compare prices of heated VS BE treated and you will understand 8).
You know treatments are not all equal. heating a stone and ADD a foreign element are 2 completely different issues...IMHO... :wink:
ciao
albé

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