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 Post subject: Blue Mystery Stone
PostPosted: Thu Feb 03, 2022 4:08 pm 
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Hi All,

I've run into a wall trying to ID this stone, it's beyond my experience and have admitted defeat. I don't think it's worth sending to a lab, I just want to know!
Many thanks for any suggestions on testing or ID...

I have a blue stone set in 18ct gold, fairly modern ring. Vitreous lustre, some nibbles to facets edges.
RI: 1.758 - 1.763 & 1.760 - 1.768 Biaxial
no sign of curved growth lines
no spectrum that I can find
not LWUV fluorescent
Dichroic dark and pale blue
dark under CCF
seems to be a cloudy type inclusion in the pavilion facets, nothing else that I can see.
No colour change effect.

I was heading towards synthetic corundum until I got the RI and now thinking synthetic chrysoberyl - is that even a thing without a colour change?


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 Post subject: Re: Blue Mystery Stone
PostPosted: Thu Feb 03, 2022 11:09 pm 
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Got a picture of this mystery blue? Syn alexandrite?

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 Post subject: Re: Blue Mystery Stone
PostPosted: Fri Feb 04, 2022 9:36 am 
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See attached, my camera isn't up to macro sadly.


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 Post subject: Re: Blue Mystery Stone
PostPosted: Fri Feb 04, 2022 9:58 pm 
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Maybe Barbra will see this and give some insight. I am not sure why you think it is not synthetic corundum. I'm not a qualified gemologist, just a gem cutter and experienced in the gem industry. Can you tell if that cloud is internal or possibly surface polish issue?

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 Post subject: Re: Blue Mystery Stone
PostPosted: Sat Feb 05, 2022 1:00 pm 
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The inclusion scene is reminiscent of kyanite, but your RI's are high for that.
https://www.gemologyproject.com/wiki/in ... le=Kyanite


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 Post subject: Re: Blue Mystery Stone
PostPosted: Sat Feb 05, 2022 1:18 pm 
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glhays wrote:
Maybe Barbra will see this and give some insight. I am not sure why you think it is not synthetic corundum. I'm not a qualified gemologist, just a gem cutter and experienced in the gem industry. Can you tell if that cloud is internal or possibly surface polish issue?


I'm pretty confident that the cloud is internal and it leads me to think flux maybe although I don't see a lot of synthetics so I'm not great at ID'ing them.

The stone definitely has 2 moving shadow edges which makes it biaxial (I've checked twice), isn't corundum unixaial negative?


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 Post subject: Re: Blue Mystery Stone
PostPosted: Sat Feb 05, 2022 1:26 pm 
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Barbra Voltaire, FGG wrote:
The inclusion scene is reminiscent of kyanite, but your RI's are high for that.
https://www.gemologyproject.com/wiki/in ... le=Kyanite


I've checked them twice and come up with the same figures, I'm really stumped on this one!! The two flanking stones are sapphires with natural inclusions so I'm wondering if the central stone has been lost and replaced with a lookalike.


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 Post subject: Re: Blue Mystery Stone
PostPosted: Sat Feb 05, 2022 2:17 pm 
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Re: synthetics. There are none with the criteria you have provided.

It's a 30 second identification using a Raman. See if you can find someone who has one.

I'm still floating on the kyanite boat. I have several faceted pieces and it looks exactly like what you have.


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 Post subject: Re: Blue Mystery Stone
PostPosted: Tue Feb 08, 2022 11:55 am 
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Barbra Voltaire, FGG wrote:
Re: synthetics. There are none with the criteria you have provided.

It's a 30 second identification using a Raman. See if you can find someone who has one.

I'm still floating on the kyanite boat. I have several faceted pieces and it looks exactly like what you have.



Thanks, not sure who to even ask, I think St Andrew's Uni has one but don't know where else to look in Scotland.


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 Post subject: Re: Blue Mystery Stone
PostPosted: Tue Feb 08, 2022 2:21 pm 
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I would try contaction the Scottish Gemmological Association.
I was a member for years.
https://www.scottishgemmology.org/


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 Post subject: Re: Blue Mystery Stone
PostPosted: Sat May 07, 2022 2:28 pm 
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Barbra: Is this possibly a benitoite? I'm just throwing it out there and was wondering why it wasn't a possibility (other than the size!).


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 Post subject: Re: Blue Mystery Stone
PostPosted: Wed May 11, 2022 12:04 pm 
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Debbie K wrote:
Barbra: Is this possibly a benitoite? I'm just throwing it out there and was wondering why it wasn't a possibility (other than the size!).

Unlikely. Benitoite fluoresces strong blue.


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 Post subject: Re: Blue Mystery Stone
PostPosted: Sat May 14, 2022 1:33 am 
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It looks like sapphire to me


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