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Originally Posted by Battara
The stone may also be glass - very common in these.
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I think that it is like Krockew write a cairngorm, some sort of smoky quartz found in the Cairngorm Mountains of Scotland, see here:
https://en.wikipedia.org/wiki/Smoky_quartz
But of course it could be very well glass, to be sure I would show it to a jeweler.