December 14-16—SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center, 1895 Camino del Rio S; Fri. 12-6, Sat. 10-6, Sun. 10-5
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 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 3:53 pm 
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Is it genuine lead- glass filled material? Why not?

Glass filled corundum is an artificial, worthless product, IMO.
https://www.gia.edu/doc/SP06A2.pdf


I've spent up to $5 on a cabochon-cut lead glass composite.


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 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 7:36 pm 
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The problem to be solved was that some ruby rough (particularly Madagascar) was seriously fractured or not very transparent. Heating to a high temperature and slowly cooling often solved the transparency problem but fractures were more serious, eventually someone worked out that hearing with ruby coloured lead glass would fill the fractures and give the stone a much greater transparency and clarity. Both treatments are acceptable PROVIDED they are disclosed and the price reflects the fact that they have been treated. Personally I would buy a ruby that had been heat treated, but not one that had been glass filled. I just don't know how the filling will react to wear over the likely life of a piece of jewellery.


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 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 7:44 pm 
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No, lead-glass filled corundum can not be termed ruby.


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 Post subject: Re: Help identifying please
PostPosted: Fri Sep 21, 2018 7:53 pm 
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Hi Barbra, very interesting and informative article, thank you. Confirms my prejudice against glass filled stones, no matter how nice they look or how cheap they are!


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 Post subject: Re: Help identifying please
PostPosted: Sat Sep 22, 2018 1:53 pm 
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You are very welcome!


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