CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Paraiba Chalcedony.
PostPosted: Tue Jul 02, 2013 8:06 am 
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It exists ? Its not chrysocolla in Chalcedony And its color is caused by copper ?


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Tue Jul 02, 2013 11:08 am 
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IMO, just an example of using some "buzz words" as a sales gimmick. I bet dollars to donuts it is available on home shopping networks.

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On Sunday, July 06, 2008, a U.S. federal trademark registration was filed for PARAIBA CHALCEDONY by Dholakia, Ketan, West Palm Beach 33421. The USPTO has given the PARAIBA CHALCEDONY trademark serial number of 77515376. The current federal status of this trademark filing is ABANDONED-FAILURE TO RESPOND OR LATE RESPONSE. The correspondent listed for PARAIBA CHALCEDONY is DHOLAKIA, KETAN of PO BOX 212225, WEST PALM BEACH, FL 33421-2225, . The PARAIBA CHALCEDONY trademark is filed in the category of Jewelery Products . The description provided to the USPTO for PARAIBA CHALCEDONY is Agate microcrystalline gemstone color-enhanced to a blue, greenish blue, bluish green or neon blue color.


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Tue Jul 02, 2013 9:27 pm 
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I have some. It is dyed. I had to add it to my collection :?

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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Tue Jul 02, 2013 9:35 pm 
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It looks very nice, btw! :D Do you know what pigments are using for dyeing it?

I can see a possible confusion and/or scam, ehm, "opportunity" with the high grade "gem silica"... :?


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Tue Jul 02, 2013 10:30 pm 
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maialetto wrote:
It looks very nice, btw! :D Do you know what pigments are using for dyeing it?

I can see a possible confusion and/or scam, ehm, "opportunity" with the high grade "gem silica"... :?


You're right! If the material were cabbed, it might be a hard ID! It is claimed on some sites that they are using copper as a coloring agent.


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Wed Jul 03, 2013 6:11 am 
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So they are not specifically from the state of paraiba in brazil just any colorless? chalcedony that has been dyed .
They look great btw.


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Wed Jul 03, 2013 9:35 am 
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this seems like a complete stretch in trying to attach these buzz words to materials where they dont apply. especially considering the difficulties surrounding name disclosure with african cu-bearing tourmalines. using paraiba to describe anything else only seems like it shold be applicable to material from the state itself... not things that resemble these other things that come from a particular place.


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Wed Jul 03, 2013 10:13 am 
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That makes 2 of us Bryan.


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Sun Oct 20, 2013 12:37 pm 
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Is it possible to take light colored paraiba or cuprian tourmaline and "add" copper somehow to increase that color? In other words, is there a known treatment?


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Sun Oct 20, 2013 2:24 pm 
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no


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Mon Oct 21, 2013 2:27 pm 
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Dyefusion? [-X Sorry could not resist... :twisted:

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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Mon Mar 04, 2019 1:32 am 
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do you know how it is dyed or which chemical is used in it so that i can asked my customer to be aware of it?


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Fri Mar 08, 2019 6:16 pm 
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I don't know about the material called "Paraiba Chalcedony", but re-reading this thread, reminded me about "Fischer stone". In that case, the coloring solution is based on CuCl2, and a bright blue/green color can be achieved. And they also add a beautiful dendrite as a bonus! They start with a porous white translucent agate ("Snakeskin agate" typically).
Image
(this is a very beautiful cab of Fischer Stone cut by Samsilverhawk)

That said, the "Paraiba Chalcedony" in question could be something entirely different. The Fischer stone seems to have some interesting similarities tho.


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 Post subject: Re: Paraiba Chalcedony.
PostPosted: Fri Mar 08, 2019 8:31 pm 
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Holy hell!


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