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 Post subject: Spinel…synthetic?
PostPosted: Wed Jul 06, 2022 1:07 pm 
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Joined: Wed Jul 06, 2022 8:22 am
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Hello, this is my first post to this forum…I hope I don’t sound too much like the rookie gemmologist that I am!
I have a pendant set with a small bright blue stone. I have a distant vision refractometer reading that indicates spinel, an unfamiliar spectrum with a wide absorption band in the blue, pinky red under Chelsea colour filter and a confusing picture on the microscope. I have attached a really poor photo showing an orange-brown mineral inclusion (label 1) which could be metallic or could be octahedral. There are also what look like gas bubbles (labelled 2). The blob marked 3 is a random reflection.

Synthetic? Natural? I would love any opinions. Apologies again for the poor photo.
With thanks!
Natasha


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 Post subject: Re: Spinel…synthetic?
PostPosted: Fri Jul 08, 2022 12:44 am 
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Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
Hello and welcome to our forum.
There is very little which can be determined by your photo. (understatement)

Please post a picture of the entire ring and note any stamping, hallmarking and /or maker's marks on the inside of the shank.

Synthetic spinel can be made, as I'm sure you know, in any color desired. It was a common birthstone replacement, mid-century.

Synthetic spinel is weirdo fluorescent. Check ir with UV

Lots Of abrasions and chipping on the crown facets. Concerning. :smt017


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 Post subject: Re: Spinel…synthetic?
PostPosted: Fri Jul 08, 2022 1:39 am 
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Joined: Fri Nov 01, 2013 9:16 am
Posts: 239
Location: Germany
Hi there,
and post your exact refractometer reading if possible.
thx

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