Post subject: Re: No luck, identifying this green stone...
Posted: Thu Sep 24, 2020 5:48 pm
Gold Member
Joined: Thu May 12, 2016 2:18 am Posts: 1542
glhays wrote:
Sounding like possibly corundum? The SG fits. The RI not far off. Awaiting final results.
Yep Greg, back to my original most likely by looking at it. Biggest issues are still unreliable RI, and corundum is DR. Looking forward to the lab report.
Post subject: Re: No luck, identifying this green stone...
Posted: Fri Oct 02, 2020 5:55 am
Active Member
Joined: Mon Aug 28, 2017 10:39 am Posts: 62 Location: Birmingham - England
I've been watching this thread with interest My immediate reaction the first time I saw it was "volcanic glass" (a current link for comparison of different polishings etc : https://www.etsy.com/market/green_volcanic_glass) also the setting doesn't appear to be very high quality to me?
Given the vague measurements discussion is there some clear reason this couldn't be volcanic glass? (I'm in learning mode here...)
Post subject: Re: No luck, identifying this green stone...
Posted: Sat Oct 31, 2020 4:26 pm
Active Member
Joined: Sat Feb 08, 2020 9:09 am Posts: 73
Update. GIA did not work for me, shipping costs are to high. However, after yet another (rather desperate) email Mr Forsberg kindely agreed to help me. And the results are back.
One faceted green stone, 7.87 ct. Measurement 11.54x9.15x7.16 mm Green stone identified by Raman to be natural green Zirkon. Specific gravity as well as other characteristics confirm this.
Post subject: Re: No luck, identifying this green stone...
Posted: Sat Oct 31, 2020 6:04 pm
Gold Member
Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
Lunacur wrote:
Hello! Trying to identify this stone has been very confusing! The stone is set in a unmarked silver ring. I'm no expert, but I think the cutting style is relatively early. This because of the small table and unpolished girdle. Please correct me if I'm wrong. The stone messures 11x9x7 mm. These are my results, so far.
The refractometer shows an RI of 1,78 and SR. However, the polariscope shows The stone as DR (blinks four times).
No reaction to either LW or SW UV light.
In the spectroscope I can see a clear absorption line in the green, about 500-550 nm.
There are inclusions in the stone. The most visible is a reddish brown fingerprint inclusion. There are also visible striations within the stone. I'm sure there is a gemological term for this that I don't know.
As always, I would be most grateful for any thoughts!
Out of curiosity how did your experts findings compare to your initial post?
Post subject: Re: No luck, identifying this green stone...
Posted: Sat Oct 31, 2020 6:40 pm
Active Member
Joined: Sat Feb 08, 2020 9:09 am Posts: 73
I don't know. I did'nt get the specific results for the tests. What I wrote is all the information I recived, except for "The conclusions have been reached by standard gemmological testing as well as by Raman-, Photoluminescence- and UV-VIS-NIR spectrometer."
Post subject: Re: No luck, identifying this green stone...
Posted: Sat Oct 31, 2020 7:50 pm
Gold Member
Joined: Thu May 12, 2016 2:18 am Posts: 1542
Great to finally have an answer.
Exactly what initial impressions said it was Zircon. The problem was conflicting gemological property observations confusing what should have been a straightforward identification. Proving once again that training is the most important tool one can buy.
Go back at look for the"Zircon" line in your spectroscope.
Post subject: Re: No luck, identifying this green stone...
Posted: Sat Oct 31, 2020 8:41 pm
Gold Member
Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
Lunacur wrote:
I don't know. I did'nt get the specific results for the tests. What I wrote is all the information I recived, except for "The conclusions have been reached by standard gemmological testing as well as by Raman-, Photoluminescence- and UV-VIS-NIR spectrometer."
Did I understand your question?
Moot really if you didn't get the detail observations from the expert. Like what RI reading, DR SR, etc. I would imagine they were all conclusive of zircon. I was just curious as to what differences your observations originally were in the post to the final. Just good food for thought to jot done in the memory bank for future reference that's all. I'm no expert just work experienced and married to gemologist so please do not take anything here out of context. Yes glad to here there was a result.
Post subject: Re: No luck, identifying this green stone...
Posted: Sat Oct 31, 2020 9:34 pm
Active Member
Joined: Sat Feb 08, 2020 9:09 am Posts: 73
[/quote] Moot really if you didn't get the detail observations from the expert. Like what RI reading, DR SR, etc. I would imagine they were all conclusive of zircon. I was just curious as to what differences your observations originally were in the post to the final. Just good food for thought to jot done in the memory bank for future reference that's all. I'm no expert just work experienced and married to gemologist so please do not take anything here out of context. Yes glad to here there was a result.[/quote]
Ok, I did'nt understand your question
For one, now I know the RI of my liquid. I have very little experience of OTL gemstones, which did'nt help. When writing the post I thought the stone was SR, but I wasnt at all sure. I guess it sort of is SR, but not like I thought. I thought spinel or garnet. Then, I admit I became a bit distractedby some replies. I was never confident in the stone being SR. Infact, not beeing sure of SR or DR was one of the reasons I posted. Anyway, up until I got the results I thought it was a spinel. I had'nt read anything about metamict zircon.
Post subject: Re: No luck, identifying this green stone...
Posted: Sun Nov 01, 2020 12:43 pm
Active Member
Joined: Sat Feb 08, 2020 9:09 am Posts: 73
I have been reading a little about low Zircon. How rare is this stone, really ? There seems to be alot of them for sale. Assuming it is a low zircon...
Users browsing this forum: No registered users and 6 guests
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum