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 Post subject: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:09 am 
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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:26 am 
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Tip #1 for GO members. Turn your sound OFF, .
I moved this post to a more appropriate category.
My first observation is that it is not a chameleon diamond.

The poor focus on the video isn't helping with identification.
Take regular, focused pics....is there a color change you've noticed?


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:34 am 
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I checked refraction value by my refractometer. Refraction value > 1.8


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:39 am 
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Do you have a polariscope? Singly or doubly refractive?
Also, are you certain your refractometer (or your personal skills with the refractometer) are reliable?


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:45 am 
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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:49 am 
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Barbra Voltaire wrote:
Do you have a polariscope? Singly or doubly refractive?
Also, are you certain your refractometer (or your personal skills with the refractometer) are reliable?

I have no Polariscope and yes I have refractometer with many experiences for gem checking which has refraction value < 1.8.-------------but this gem refraction value can not be read due to that value > 1.8


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:53 am 
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It is yellowish green for sunlight and also lights. And it gets brownish red in dark environment.


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:54 am 
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That video doesn't help.
Have you considered sphene, andradite garnet?


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 11:59 am 
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some valuable ganets may by > 1.8---------but color change in the dark is ,special quality of this gem.


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 12:10 pm 
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Is it Zircon gem ? Please answer


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:14 pm 
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Green zircon is green because of metamictization.
A metamict green zircon will have a refractive index below 1.8.


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:31 pm 
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Barbra Voltaire wrote:
Green zircon is green because of metamictization.
A metamict green zircon will have a refractive index below 1.8.

yes----Refractive index nω = 1.925–1.961
nε = 1.980–2.015, 1.75 when metamict
----from wikipedia


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:39 pm 
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natural zircon is actually the oldest mineral on Earth. ... This so-called metamict zircon is always green or brown in color. ... The green metamict zircon is quite rare and is prized by collectors.


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 1:41 pm 
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Mostly, I guess that This gem is Chamillion Diamond.


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 Post subject: Re: Please help to recognize this gem.
PostPosted: Sun Aug 11, 2019 4:28 pm 
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If the value was 1.75 it would be close to a Diaspore or Zultanite gem.


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