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Strange brooch possibly glass

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Pat:
I've got this vintage brooch which I think was probably brought back from Italy around the time of the old mosaic jewellery. It has a brass surround and a cameo like portrait. On the back it has minor chips around the edge from manufacture and they are shiny which makes me think the item is glass but I'm still not really sure. Any opinions please?

http://glassgallery.yobunny.org.uk/displayimage.php?pos=-4310

Ivo:
i think it's cameo - not "cameo like".

Sue C:
It is a cameo, and most cameos were carved out of shell which can be chipped, and some are so fine they resemble glass, i think the shell is conch?.

Pat:
Hi Ivo. I meant cameo like as  not shell. The back od the brooch is all pitted like it's been on send when hot.

Ivo:
True cameo is carved from semiprecious stone (agate & suchlike) and may show natural colour variation like yours does.  Such stone has a high density and the back is usually polished flat.
If the back is pitted the material may be cast resin...

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