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Please help to recognize this gem. https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=6&t=25332 |
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Author: | chamillion [ Sun Aug 11, 2019 11:09 am ] |
Post subject: | Please help to recognize this gem. |
Author: | Barbra Voltaire, FGG [ Sun Aug 11, 2019 11:26 am ] |
Post subject: | Re: Please help to recognize this gem. |
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? |
Author: | chamillion [ Sun Aug 11, 2019 11:34 am ] |
Post subject: | Re: Please help to recognize this gem. |
I checked refraction value by my refractometer. Refraction value > 1.8 |
Author: | Barbra Voltaire, FGG [ Sun Aug 11, 2019 11:39 am ] |
Post subject: | Re: Please help to recognize this gem. |
Do you have a polariscope? Singly or doubly refractive? Also, are you certain your refractometer (or your personal skills with the refractometer) are reliable? |
Author: | chamillion [ Sun Aug 11, 2019 11:45 am ] |
Post subject: | Re: Please help to recognize this gem. |
Author: | chamillion [ Sun Aug 11, 2019 11:49 am ] |
Post subject: | Re: Please help to recognize this gem. |
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 |
Author: | chamillion [ Sun Aug 11, 2019 11:53 am ] |
Post subject: | Re: Please help to recognize this gem. |
It is yellowish green for sunlight and also lights. And it gets brownish red in dark environment. |
Author: | Barbra Voltaire, FGG [ Sun Aug 11, 2019 11:54 am ] |
Post subject: | Re: Please help to recognize this gem. |
That video doesn't help. Have you considered sphene, andradite garnet? |
Author: | chamillion [ Sun Aug 11, 2019 11:59 am ] |
Post subject: | Re: Please help to recognize this gem. |
some valuable ganets may by > 1.8---------but color change in the dark is ,special quality of this gem. |
Author: | chamillion [ Sun Aug 11, 2019 12:10 pm ] |
Post subject: | Re: Please help to recognize this gem. |
Is it Zircon gem ? Please answer |
Author: | Barbra Voltaire, FGG [ Sun Aug 11, 2019 1:14 pm ] |
Post subject: | Re: Please help to recognize this gem. |
Green zircon is green because of metamictization. A metamict green zircon will have a refractive index below 1.8. |
Author: | chamillion [ Sun Aug 11, 2019 1:31 pm ] |
Post subject: | Re: Please help to recognize this gem. |
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 |
Author: | chamillion [ Sun Aug 11, 2019 1:39 pm ] |
Post subject: | Re: Please help to recognize this gem. |
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. |
Author: | chamillion [ Sun Aug 11, 2019 1:41 pm ] |
Post subject: | Re: Please help to recognize this gem. |
Mostly, I guess that This gem is Chamillion Diamond. |
Author: | offimatrix [ Sun Aug 11, 2019 4:28 pm ] |
Post subject: | Re: Please help to recognize this gem. |
If the value was 1.75 it would be close to a Diaspore or Zultanite gem. |
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