Joined: Fri Nov 01, 2013 9:16 am Posts: 239 Location: Germany
ever saw a green one?
bought from a collector with certificate which states as natural spinel. Color is (for me) to good to be true. If natural - a very interesting stone...
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bought from a collector with certificate which states as natural spinel. Color is (for me) to good to be true. If natural - a very interesting stone...
I want to ad that we checked the stone - it is spinel, not Gahnite or Gahnospinel ( RI is in the range of natural spinel - or some newer synthetic). Eyeclean - no diagnostic inclusions.
We know that this color was used to imitate Turmalin.
But there is a Gem report??? So many "???"
Barbra - maybe it would be better to move this to "CSI".
Post subject: Re: Green spinel - natural or synthetic?
Posted: Fri Sep 02, 2016 12:37 pm
Valued Contributor
Joined: Fri Nov 01, 2013 9:16 am Posts: 239 Location: Germany
So I verfied the Gemreport at the lab. It is authentic as they replied. Also I tested the spectrum of the stone. As you can see the Fe-Line is visible at 458 nm.
So it seems to be a natural green spinel as I suppose....
Post subject: Re: Green spinel - natural or synthetic?
Posted: Tue Sep 06, 2016 10:45 am
Valued Contributor
Joined: Fri Nov 01, 2013 9:16 am Posts: 239 Location: Germany
Hi Isi, will try to check it today evening. I thought I tested it already and RI-Reading was around 1.718, but I am not sure as I have the stone already a while. Will check also with polarizers...
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