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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 1:21 am 
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Hello everyone,

Apologies for my absence. I haven’t been watching this forum.

I have news on the blue topaz. LFG Lab of Paris has also classed the Topaz as natural blue untreated topaz. So now there are certificates from 2 independent labs.

Also someone mentioned earlier about natural inclusions in the stone. Yes there is a light feather through the large stone that was present in the rough piece before cutting and visible in the finished stones.

I don’t get notifications for this website for some reason so if anyone wants to email me directly about the stones my email is:

ricardo.barfuss@gmail.com

Cheers
Ricardo


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 2:15 pm 
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Can you post links to these reports?


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 4:50 pm 
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I am just wondering on what basis the untreated call was made. I don't know of a test that can prove this call and would like to learn about it if it exists.


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 7:13 pm 
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Here is a link to RockSolidinc's original post:
viewtopic.php?f=6&t=24240&p=239748#p239748


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 7:59 pm 
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Apparently some research shows that CL may provide a way of determining between irradiated and natural blue topaz. I would like to see amore research from other labs on this.


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 8:14 pm 
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The article on CL is a decade old.
If it was an option,it would have received more press.

If one goes to the LFG website, the topaz treatment they list as detectable is coating.


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 9:24 pm 
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Barbra Voltaire wrote:
Can you post links to these reports?


I’ll post up photos when I get back home of all the reports. LFG have kept an off it piece for further analysis I believe fingerprinting, to know more about the deposit in which it was found


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 03, 2019 9:26 pm 
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I forgot to mention I have seen other natural blue topaz from this field that has a similar colour though the owners don’t have certificates, they just mined the topaz themselves and kept for their own collection


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Sun Jul 07, 2019 5:52 am 
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I know very well the manager of the LFG in Paris, if you guys allow me to do that and are interested, I'll ask him directly his opinion about this case and the analysis they were led to do, and will keep you informed.


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Sun Jul 07, 2019 2:49 pm 
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That would be super, Isi.

I stumbled on an article alluding to the presence of Germanium in colorless topaz which may be responsible for the transition to blue after irradiation.
:smt017
The topic was presented at the College of Chemical Sciences in Ceylon, entitled "Chemistry of Irradiation Treatment of Gems". Author: Fernando P.R.K., Udawatta C.P.
Image
The question now becomes is Germanium ALWAYS a trace element found in topaz or is it unique to colorless topaz?

The references were listed as follows:
Image

Although I own most of these books, I have not had an opportunity to check them.


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Sun Jul 07, 2019 9:07 pm 
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Here are the LFG certificates, as well as a couple photos of the rough piece before it was cut


Attachments:
IMG_0833.JPG
IMG_0833.JPG [ 113.98 KiB | Viewed 269 times ]
IMG_0832.JPG
IMG_0832.JPG [ 125.18 KiB | Viewed 269 times ]
Heart of Neptune LFG.jpg
Heart of Neptune LFG.jpg [ 430.14 KiB | Viewed 269 times ]
Rigel, Star of Orion LFG.jpg
Rigel, Star of Orion LFG.jpg [ 425.88 KiB | Viewed 269 times ]
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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Mon Jul 08, 2019 4:08 am 
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Again, as for the GRS report, no indication of treatment doesn't mean IMO that the stone hasn't been treated, only that it was impossible to find any indication of the treatment. Which is hardly surprising given today's lab technologies.
Nowhere is it said that the stone is untreated.
Anyway I'll ask my friend what the lab policy is while delivering this type of report, which I find a bit misleading.


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 10, 2019 7:03 am 
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OK, so I collected a few informations about these LFG reports but not much, obviously my friend is bound by some kind of professional secrecy which we have to respect of course, event if it's frustrating.
He told me that it was a "delicate matter". He remembered that, seen from the side, the stones are near to colorless, and that the blue color facing up is only due to a very good cut. He said that the rough is near to colorless too.
No special or new analysis have been led on the stones, other than the usual ones, but the context surrounding these stones led the lab to conclude "no indication of treatment". He says he feels pretty convinced that these stones haven't been treated but couldn't say much more about what led him to this conclusion.
Here we are ! :-k


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 10, 2019 7:55 am 
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Thankyou for checking up on that I appreciate it. I can assure as the owner that the topaz has not been treated. Especially considering I’ve seen other stones from the same area. Hopefully we will find some more!


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 Post subject: Re: GRS report for 'untreated blue topaz'
PostPosted: Wed Jul 10, 2019 9:32 am 
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That explanation seems inconsistent with the picture of the rough. This shows a reasonably strong saturation prior to cutting. It is hard to credit the cut with the color in light of this. The stated logic seems to be lacking in scientific basis for such a call.


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