New Mineral Named After GIA’s John Koivula
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 Post subject: 17.34ct Colour Change natural zircon from Burma
PostPosted: Mon Jun 03, 2013 8:49 pm 
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Hi all,

I recently bought a 17.34 CC Zircon from Burma. It is ia very attractive gemstone, and I love CC properties in gemstones in general, so once it was certified to be natural I bought it.

It is very pale purple in daylight, and changes to very pale green at night. I am attaching a picture, but it is impossible to capture the pale purple, somehow the camera only captures the greenish tones. The stone I see on my hand and photograph are 2 different colours.

Attachment:
File comment: Colour Change Burmese Zircon 2
CC Zircon 2 (319x450).jpg
CC Zircon 2 (319x450).jpg [ 101.4 KiB | Viewed 2139 times ]


I have been trying to do some research on CC zircons, however found very little information. Only found some snippets from the 2006 GIA G&G article, and a tiny article from SSEF.

I was hoping some of the experts and collectors here could shed more information on this facsinating gem.

Thank you

Attachment:
File comment: Colour Change Burmese Zircon
CC Zircon 1 (450x299).jpg
CC Zircon 1 (450x299).jpg [ 86.29 KiB | Viewed 2139 times ]


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 Post subject: Re: 17.34ct Colour Change natural zircon from Burma
PostPosted: Mon Jun 03, 2013 9:32 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
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Location: San Francisco
The color change you are describing would be a reverse color change.
We've discussed something similar here:
http://www.gemologyonline.com/Forum/php ... php?t=2632


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 Post subject: Re: 17.34ct Colour Change natural zircon from Burma
PostPosted: Tue Jun 04, 2013 5:13 am 
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Thank you for the link Barbara, have read it through, and it is interesting.

If any forum members have a Colour Change Zircon in their collection, please share pictures if possible, would love to see more specimens of this gem!

Thanks!


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 Post subject: Re: 17.34ct Colour Change natural zircon from Burma
PostPosted: Tue Jun 04, 2013 6:27 pm 
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Joined: Tue Oct 17, 2006 11:33 am
Posts: 402
Location: New Zealand
Hi

yes I have a whole collection of color-change Zircons, I am working on a Gemological articel together with the SSEF about this subject. You can see a short preview about it in the SSEF online magazin Facette no20(page 19) http://www.ssef.ch/home/ .
How ever some things have changed since the GIA article in 2006, I was able to prove that the color change was induced through heat treatment.

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