CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Id stone
PostPosted: Wed Jun 19, 2019 6:22 pm 
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Hi please help id gems in brooch
They could scratch glass
Have fluorescence yellow in UV became green
Pink in UV became blue


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 Post subject: Re: Id stone
PostPosted: Wed Jun 19, 2019 9:13 pm 
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Would you kindly take a picture of the back of the pin?
The solid backs visible where the stones are missing suggest probable foil backing.
I suspect foil backed glass.


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 Post subject: Re: Id stone
PostPosted: Thu Jun 20, 2019 3:52 am 
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Barbra Voltaire wrote:
Would you kindly take a picture of the back of the pin?
The solid backs visible where the stones are missing suggest probable foil backing.
I suspect foil backed glass.


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 Post subject: Re: Id stone
PostPosted: Thu Jun 20, 2019 3:54 am 
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Barbra Voltaire wrote:
Would you kindly take a picture of the back of the pin?
The solid backs visible where the stones are missing suggest probable foil backing.
I suspect foil backed glass.


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File comment: Is NOT glass it easy scratch glass and have fluorescence
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 Post subject: Re: Id stone
PostPosted: Thu Jun 20, 2019 9:55 am 
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The type of cutting, the setting metal and the general luminosity certainly suggest fancy cut glass. Kind of costume jewelry.


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 Post subject: Re: Id stone
PostPosted: Thu Jun 20, 2019 6:36 pm 
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Isi and I are in agreement.


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 Post subject: Re: Id stone
PostPosted: Fri Jun 21, 2019 3:19 am 
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Glasses range widely in composition and hence hardness, so that fact that these stones scratch glass is not proof that they cannot be glass. Depending on composition glass can be fluorescent. Look for swirl marks and bubbles, under magnification.


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