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 Post subject: Paraiba Or Cuprian Tourmaline
PostPosted: Thu Apr 03, 2008 11:19 am 
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Hi

A few months ago I got my Tourmaline Elbaite variety certified as Pariaba in Germany the certificate can be viewed at

http://www.flickr.com/photos/precious-stones/

After Cutting the stone I took it to GRS . They only claim it to be Curpian Elbaite and not Paraiba they said Paraibas are not of these colors. Only greenish Blue.

Can somebody please tell me what kind of stone this is paraiba or cuprian.

What does AIGS certificate this kind of stone as?

Thanks


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 Post subject:
PostPosted: Thu Apr 03, 2008 12:06 pm 
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Location: San Francisco
It appears that this is simply an issue of nomenclature.
Many labs refer to all copper bearing elbaite as "paraiba" regardless of locality, apparently GRS does not.
:?


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 Post subject:
PostPosted: Thu Apr 03, 2008 1:52 pm 
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Wow I love this forum...fast hands..quick reply.


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 Post subject: Re: Paraiba Or Cuprian Tourmaline
PostPosted: Fri Apr 04, 2008 1:07 am 
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Location: Bangkok, Thailand
easywaygems wrote:

What does AIGS certificate this kind of stone as?

Thanks


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Dear easywaygems, regarding "Paraiba", different labs might have different opinions and policies. Some major labs are trying to harmonize their policies and have issue the following worksheet:

http://www.gubelinlab.com/pdf/LMHC_InformationSheet_6_Paraiba.pdf

Now as the different labs you are speaking about are not member of this group, they might have a different opinion regarding this issue and the only way to find out is probably to ask directly to these labs or to submit the stone to them...
People in this forum might be able to give you their opinion about what they believe this or that lab will say but at the end it will remain speculations. If you want to know for sure: why don't you ask them directly or why don't you submit the stone to them?

Hoping to have helped,
All the best,

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Vincent Pardieu

www.fieldgemology.org
www.conservationgemology.org

The views expressed here are V. Pardieu’s opinions and do not necessarily reflect those of GIA Laboratory Bangkok (http://www.giathai.net)where he is an employee since Dec 2008.


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 Post subject:
PostPosted: Sun Apr 06, 2008 6:44 am 
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Dear easywaygems,

Thank you for your post (and your email).

I have responded to your email few days ago, regarding your question and in fact my answer was quite the same as Vincent did ... the best way to be sure of what a gem lab might says (AIGS Lab or others) is to submit directly the stone to them or show them the stone “in real”.

I would like to take the opportunity of this post to give you my opinion regarding the "identification" of a stone just from a picture or an oral description...

I learn something very early in my gemological carrier, that is to never judge or give a precise opinion of a stone from a picture or an oral description (both of those requests often happen, I am sure that I am not the only person on this forum who faced this situation ...). I used to teach to my students this too: “be wise and never give an answer to someone who asks your opinion on a gemstone only from a picture or a verbal description. Too risky, too many possibilities and so, too many mistakes. Don’t forget that, when your give your opinion, it’s a kind of engagement... “
I had never complains about this advice... :P

Thank you trusting AIGS Gem Laboratory

Dr. Laurent Massi
AIGS Gem Lab director.

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 Post subject:
PostPosted: Mon Apr 07, 2008 3:21 pm 
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Thank you all for sharing your thought. I really Appreciate and find it helpful.
Once again My thanks to ,Barbra Voltaire,vincent pardieu and Laurent Massi

To Mr Laurent Massi.
Yes , I did get your email I am in Chanthaburi. I will call you up as soon as I am in Bangkok. This forums is great!

Regards
Dhihal


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 Post subject: Color and Cuprian!!
PostPosted: Thu May 08, 2008 10:23 am 
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Joined: Mon Jan 29, 2007 5:16 am
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Location: Ohio
I just wrote a post about this issue on my blog that may be of interest to some of you. It is amazing how many different answers come up when the words "cuprian" or "Paraiba" are in the question!

http://tiptopgem.wordpress.com/

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Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great. ~Mark Twain


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