CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Diffusion in blue sapphire cabs
PostPosted: Thu Apr 04, 2013 2:27 am 
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Hello all :)
What is the best way to identify diffusion in blue sapphire cabs?
I have just received a parcel and the price seems too good to be true.
Can anyone help, please?
Thank you in anticipation


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 Post subject: Re: Diffusion in blue sapphire cabs
PostPosted: Thu Apr 04, 2013 10:12 am 
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hi,

i think the best way to spot for surface diffusion remains microscope observation in immersion. of course in cabs is more difficult to see due to lacking of the web effect....... sometimes titanium oxides generate a stronger coloration in reaching surface fractures, look carefully if you can find some.

ciao
alberto

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 Post subject: Re: Diffusion in blue sapphire cabs
PostPosted: Thu Apr 04, 2013 11:28 am 
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Did you mean surface color diffusion or star diffusion?
Alberto is correct on surface color diffusion.
For star diffusion look for small crooks in the rays.

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 Post subject: Re: Diffusion in blue sapphire cabs
PostPosted: Mon Apr 08, 2013 9:16 pm 
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Also, diffused stars will show the star in indirect lighting. Not the case with natural stars, you need a direct light source.

Unless of course, they've come up with new technology.


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