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PostPosted: Thu Mar 26, 2009 12:43 pm 
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Mauricio Favacho wrote:
thats a diferent blue that can be distinguishe easily.


but you need to be hurry, before the color disappears.
welcome Mauricio.
ciao
alberto

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PostPosted: Thu Mar 26, 2009 3:54 pm 
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Thanks ,

I Feel happy of doing this sharing with gemlovers as I am.

I belong to the geological department of UFPA- University of Pará State-Brazil , a University inside the Amazon Region, in a city named Belem. We have some well equiped lab concerning minerals research, and a gem lab also that need some enthusiastic people like me to spread the gemology education for graduated student. My knowledge concerning about cobalt-60 is because of my old job in a gamma facility based on Sao Paulo.

Mauricio



gem-n00b wrote:
Mauricio, welcome to GO and thanks for sharing your insight as an "insider" at a Cobalt-60 irradiation facility. I hope you enjoy it here and have a chance to share more of your knowledge with us.

:D

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PostPosted: Thu Mar 26, 2009 4:07 pm 
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Did you ever have any experience with using radiation on Brazilian tourmalines?


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PostPosted: Thu Mar 26, 2009 8:26 pm 
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Yeap, we use to treat slightely pink toumaline from Morro Redondo Region-Minas Gerais, Such tourmaline usually became deep in color and some pink tourmaline from Nigeria to became rubelite (red) in color, only those colors can be acquired by gamma processing. However, both of them needs a subsequent heat treating which use to be the secret of the dealer. This facility is considered unique and this succesful process never been noticed abroad, but some Chinese and Indian dealer know better and keep it in secret.

Mauricio Favacho

gem-n00b wrote:
Did you ever have any experience with using radiation on Brazilian tourmalines?

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PostPosted: Thu Mar 26, 2009 8:35 pm 
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Thats right, it completely unstable on color, even though in the safe with no heat it will fade, It is probably an unfair practice of bussiness, but it does not mean that you cannot find a stable color, this color center is not well understood.

Mauricio Favacho


Alberto wrote:
Mauricio Favacho wrote:
thats a diferent blue that can be distinguishe easily.


but you need to be hurry, before the color disappears.
welcome Mauricio.
ciao
alberto

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 Post subject: Morganite Treatments
PostPosted: Thu Mar 26, 2009 8:42 pm 
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I missed this thread when it first started, but now that it has started again, I can report that in the GJX show in Tuscon this year there was
a Brazilian dealer with large perfect pink-orange morganite rough for sale.
He must have had 5-6 kilos of rough all the size of your thumb or better.
This was all treated material. He said it ws irradiated and then heated. The price was $50/gr. I think we can expect to see a lot of nice large cut morganite on the market soon.

Tom Kidwell


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 Post subject: Re: Morganite Treatments
PostPosted: Fri Mar 27, 2009 8:54 am 
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TOM KIDWELL wrote:
I missed this thread when it first started, but now that it has started again, I can report that in the GJX show in Tuscon this year there was
a Brazilian dealer with large perfect pink-orange morganite rough for sale.
He must have had 5-6 kilos of rough all the size of your thumb or better.
This was all treated material. He said it ws irradiated and then heated. The price was $50/gr. I think we can expect to see a lot of nice large cut morganite on the market soon.

Tom Kidwell


Hi Tom,

In a way you are right, this is being done and that rough was there. It is NOT a new thing however, this has been going on for years and if anything the rough is less available than it was a year or two ago.

A new German treatment is being done that does give a little deeper less orange color though, it supposedly can only be done on medium to smaller sizes as the very large pieces do not fit through the tube that is used in the process. (Hearsay from Brazilian friends.)

I would not expect or predict a flood of this material though, Brazilian mining is down and currently the market depends mostly on the Mozambique material which is not more available now that it was a few years ago. In fact it seems that there is a little less on the market.

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PostPosted: Sun Apr 12, 2009 4:21 pm 
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Does anyone know if this irradiation is detectable? I'm looking at some morganite that the vendor says is untreated. It is a large (over 40cts) stone and a rich pink orange. Just wondering if it's likely to have been treated.

Jason

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PostPosted: Wed Apr 22, 2009 3:38 am 
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Anyone have a recipe for heat treating morganite? I saw the temp as 400 C, but any ideas on temp ramp and soak time? Anyone done this?

I just picked up a nice bunch of stones, but they are too small and too light, besides i'd like to experiment here..

thx!

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PostPosted: Sat Apr 25, 2009 5:21 pm 
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jleb wrote:
Anyone have a recipe for heat treating morganite? I saw the temp as 400 C, but any ideas on temp ramp and soak time? Anyone done this?

I just picked up a nice bunch of stones, but they are too small and too light, besides i'd like to experiment here..

thx!


Heat lightens and removes the brown/orange component, it does not to my knowledge make the gems darker.

For that you need irradiation which is complicated and costly, especially in small volumes.

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PostPosted: Wed May 06, 2009 5:08 am 
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Hello everyone, first post for me on this forum;

First of all congratulations for the forum, I did not think there could be such a big place online for sharing gemological ideas and opinions.

Regarding the Raman spectrum of irradiated (and heated) Morganite, do you think it could distinguish from natural ones? If it can be interesting i could try to get one.

We are buying this irradiated material and i can confirm that the color is stable; I also confirm that there is an old treatment and a newer one wich gives a different hue, "little deeper less orange color" as said before on the discussion.

Ciao

Fabrizio


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PostPosted: Wed May 06, 2009 5:14 am 
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Hi Fabrizio and WELCOME to the Forum :D
Gee, another Italian buddy here, BENVENUTO!! 8)
ciao
alberto

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 Post subject: Re: Morganite Treatments?
PostPosted: Wed Jun 29, 2011 5:24 am 
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Update:


I met the topaz treater I got the info from initially at the Sainte Marie aux Mines fair. I asked him again after seeing a bunch of morganite rough on his table and he came with a different version of the story this time. Where last time I spoke with him it was a yuckie green beryl that irradiated to blue and then heated to pink this time it was something different... Goshenite from certain places, he couldn't tell me which ones (he said he was getting it from 'the Africans' who were telling him it came from Mozambique one week and Brazil the next, but of course it is possible he knows very well where it is coming from and likes to keep that to himself) irradiated to a smokey brown and then heated to pink. He had the irradiated smokey brown beryl for sale next to the morganite and I grabbed a couple of pieces and will send 'm off to different labs so they can have their way with it. Here's the pics to give you an idea of the colors:

Image

Image


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 Post subject: Re: Morganite Treatments?
PostPosted: Wed Jun 29, 2011 2:10 pm 
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That uniformity of color looks a lot like what I've been seeing at some of the shows.. too uniform to be natural.. all that same shade..
Very interesting..thanks for the pix Tim!

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 Post subject: Re: Morganite Treatments?
PostPosted: Thu Dec 29, 2011 12:04 pm 
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our man in brazil says topaz, morganite, prasiolite and who knows what other stuff is treated (in sao paulo?) by a company called EMBRARAID.

he also confirmed that morganite is being sent to germany for irradiation. results from the german process are better.
he estimates that 90% of the morganite hitting the (brazilian) market are irradiated. i don´t know if this is a wild or an educated guess.

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