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 Post subject: Nat vs Syn Sapphire
PostPosted: Fri Aug 14, 2020 9:37 am 
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Location: Cape Town
This contentious sapphire is violet when viewed under daylight equivalent light. It is free of inclusions but for the fine curved hair like inclusion. I have read that one can get curved platinum inclusions like this one in some Chatham Synthetics (GIA Fall 1982 Pg 153). It has a typical ruby spectrum with a strong chromium presence. The issue is the client is getting different opinions, some say natural and some say synthetic. LWUV - bright violet red. SWUV - dull violet red. I have no doubt it isn't a Vernueil synthetic but possibly Chatham if synthetic.
I would appreciate any comments based on the above.


Attachments:
File comment: Very strong chromium presence
IMG_1812.jpg
IMG_1812.jpg [ 41.33 KiB | Viewed 439 times ]
File comment: Strong red colour when a daylight equivalent fibre optic light (150W) is passed through it.
DSC_0043.jpg
DSC_0043.jpg [ 4.68 MiB | Viewed 439 times ]
File comment: This is a pic of the fine needle inclusion that bends like the one in the GIA article.
DSC_0031.jpeg
DSC_0031.jpeg [ 4.5 MiB | Viewed 439 times ]
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 Post subject: Re: Nat vs Syn Sapphire
PostPosted: Fri Aug 14, 2020 5:40 pm 
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Location: San Francisco
Can you provide a picture of the stone without magnification in a normal lighting situation?
Thanks


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 Post subject: Re: Nat vs Syn Sapphire
PostPosted: Sat Aug 15, 2020 2:22 am 
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Barbra Voltaire, FGG wrote:
Can you provide a picture of the stone without magnification in a normal lighting situation?
Thanks


The picture was taken out doors in natural morning light.


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 Post subject: Re: Nat vs Syn Sapphire
PostPosted: Sat Aug 15, 2020 2:41 am 
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I managed to get these two pictures. 60x magnification.


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File comment: Sorry these pictures aren't too clear. 60x mag
DSC_0048.jpeg
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File comment: 60x magnification immersed.
DSC_0039.jpeg
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 Post subject: Re: Nat vs Syn Sapphire
PostPosted: Sat Aug 15, 2020 9:39 am 
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That last image sure looks like a classic platinum inclusion found in Chatham synthetics. If the needle from your first set of images is indeed curved(I cannot tell from the image), I lean towards synthetic. The Chrome line in the spectra is consistent but hardly definitive.

Gemology should not be practiced through on line images so take this with a grain of salt.


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 Post subject: Re: Nat vs Syn Sapphire
PostPosted: Sat Aug 15, 2020 12:16 pm 
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1bwana1 wrote:

Gemology should not be practiced through on line images so take this with a grain of salt.


Absolutely. The responses assist in going in a direction of research that I may have missed.
I appreciate all the responses.


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